阅读说明：本技术 粗粒料三维块体系统生成方法、装置、存储介质及设备 (Coarse particle material three-dimensional block system generation method and device, storage medium and equipment ) 是由 徐栋栋 林绍忠 程展林 卢波 邬爱清 汪斌 潘家军 王奔 胡伟 向前 刘小红 于 2021-07-23 设计创作，主要内容包括：本申请公开了一种粗粒料三维块体系统生成方法、装置、存储介质及设备,属于虚拟现实技术领域。该方法包括：根据级配要求,获取满足级配要求的粗粒料三维块体系统随机投放前的颗粒集,颗粒集的总体积待投放粗粒料颗粒试样的总体积相等；构建待投放区域,待投放区域的底面形状与待生成粗粒料三维块体系统的底面形状相同,待投放区域的高度大于待生成粗粒料三维块体系统的高度；将粗粒料三维块体系统随机投放前的颗粒集中的颗粒在随机投放模型的控制条件下,投放至待投放区域,得到随机投放的粗粒料三维块体系统；针对随机投放的三维块体系统在高度方向压实。该装置、存储介质及设备能够用于实现该方法。其能够严格满足颗粒级配分布要求。(The application discloses a coarse particle material three-dimensional block system generation method, a coarse particle material three-dimensional block system generation device, a coarse particle material three-dimensional block system generation storage medium and coarse particle material three-dimensional block system generation equipment, and belongs to the technical field of virtual reality. The method comprises the following steps: according to the grading requirement, obtaining a particle set which meets the grading requirement and is before the coarse particle three-dimensional block system is randomly thrown, wherein the total volume of the particle set is equal to that of a coarse particle sample to be thrown; constructing a region to be put in, wherein the shape of the bottom surface of the region to be put in is the same as that of the three-dimensional block system of the coarse aggregate to be generated, and the height of the region to be put in is greater than that of the three-dimensional block system of the coarse aggregate to be generated; putting the particles in the particle set before the three-dimensional block system of the coarse aggregate is randomly put into a region to be put under the control condition of a random putting model to obtain the randomly put three-dimensional block system of the coarse aggregate; the compaction is performed in the height direction aiming at the randomly thrown three-dimensional block system. The apparatus, storage medium, and device can be used to implement the method. Which can strictly meet the requirement of particle grading distribution.)

1. The method for generating the three-dimensional block system of the coarse granules is characterized by comprising the following steps:

according to the grading requirement, obtaining a particle set which meets the grading requirement and is before the coarse particle three-dimensional block system is randomly thrown, wherein the total volume of the particle set is equal to that of a coarse particle sample to be thrown;

constructing a region to be thrown, wherein the shape of the bottom surface of the region to be thrown is the same as that of the bottom surface of the coarse particle three-dimensional block system to be generated, and the height of the region to be thrown is greater than that of the coarse particle three-dimensional block system to be generated;

putting the particles in the particle set before the three-dimensional block system of the coarse aggregate is randomly put into the area to be put under the control condition of a random putting model to obtain the randomly put three-dimensional block system of the coarse aggregate;

and compacting the randomly thrown three-dimensional block system in the height direction to obtain the selected coarse particle three-dimensional block system.

2. The method for generating the coarse granular three-dimensional block system according to claim 1, wherein in the step of obtaining the particle set before the coarse granular three-dimensional block system meeting the grading requirement is randomly thrown according to the grading requirement, the coarse granular particles in each grading meet the following conditions:

wherein the content of the first and second substances,

V_iin the i-th gradation, the particle size lies inTotal volume of coarse particles in the interior, wherein P_i ^s-a set particle size of the i-th grading,the set particle size of the i +1 th gradation;

V_g-the total volume of the coarse grain particle sample to be dosed;

in the i-th gradation, the particle diameter is P_i ^sAnd the volume content of the coarse particles smaller than the particle size is the percentage;

in the i +1 th gradation, the particle diameter isAnd the volume content of the coarse particles smaller than the particle size is the percentage;

i is a natural number.

3. The method for generating the coarse aggregate three-dimensional block system according to claim 2, wherein the step of obtaining the particle set before the coarse aggregate three-dimensional block system meeting the grading requirement is randomly thrown according to the grading requirement specifically comprises the following steps:

randomly extracting a particle from the reference morphology library and calculating its volumeAnd diameter D of the smallest circumscribed ball^s；

Calculating random size scalingControlling the particle size atWithin the range:

wherein the content of the first and second substances,

then, the volume of the particles after scalingCan be expressed as:

the particle size is 0.99P_i ^s～P_i ^sOrFiltering out particles in the range;

repeating the operation until the particle size is withinParticles within the rangeTotal volume V of_iCExceeds V for the first time_i(ii) a To make V_iC＝V_iThe size of all particles that have been generated can be scaled uniformly as follows:

wherein L is_rBetween 0.99 and 1.0.

4. The method for generating the coarse aggregate three-dimensional block system according to claim 2, wherein the method for obtaining the vertex coordinate information of the particles in the particle set before the coarse aggregate three-dimensional block system is randomly thrown comprises the following steps:

traversing all generated particles under the i-th gradation, firstly determining the centroid point of the particle m

Then determined by O_mDirection vector pointing to particle vertex j

Scaling the direction vector of each particle vertex in the same proportion;

randomly rotating the angle alpha, beta and gamma around the x, y and z axes by taking the centroid of each particle as a base point, and calculating the coordinate of the top point of the particle after scaling

Wherein the content of the first and second substances,

5. the method for producing the three-dimensional block system of coarse granules according to claim 1, wherein the region to be thrown comprises a bottom restraint plate and a side restraint plate,

the radial section shape of the side restraining plate is the same as that of the bottom restraining plate,

the side restraining plates are fixedly connected to the outer edge of the bottom restraining plate through the bottom edges of the side restraining plates,

the axial height of the side restraining plate is larger than the height of a coarse particle material three-dimensional block system to be generated,

and forming the region to be thrown between the bottom restraint plate and the side restraint plate.

6. The method of claim 1, wherein the step of compacting the randomly deposited three-dimensional mass system in the height direction to obtain the three-dimensional mass system of coarse particles is performed by a compacting plate, wherein,

the shape of the compaction plate is the same as the radial cross section shape of the side restraint plate, and a moving pair along the axial direction of the side restraint plate is formed between the compaction plate and the inner wall of the side restraint plate.

7. The method for generating a three-dimensional block system of coarse particles according to claim 1, wherein the step of compacting the randomly-placed three-dimensional block system in the height direction to obtain the three-dimensional block system of coarse particles comprises the following steps:

in the initial stage of compaction, calculating by adopting pure power;

when a randomly thrown three-dimensional block system of coarse granules is bottomed for the first time, applying power calculation with damping;

preferably, the step of feeding the particles in the particle set before the randomly feeding the three-dimensional bulk system of coarse particles to the region to be fed under the control condition of the random feeding model to obtain the randomly-fed three-dimensional bulk system of coarse particles specifically includes the following steps:

randomly putting the particles in the particle concentration before the coarse particle material three-dimensional block system is randomly put into the area to be put by taking the centroid as a base point;

according to the minimum circumscribed spherical radius and the spherical center point coordinates of the particles thrown into the area to be thrown, ensuring that the particles thrown into the area to be thrown are not overlapped with each other;

repeating the operation until all the particles in the particle set before random putting are put into the system to obtain a randomly put coarse particle three-dimensional block system;

preferably, the randomly thrown three-dimensional block system is compacted in the height direction to obtain the coarse aggregate three-dimensional block system by adopting a three-dimensional discontinuous deformation analysis method under the conditions of set loading step number, loading curve, single-step allowed maximum displacement ratio, time step length and damping;

preferably, the step of compacting the randomly thrown three-dimensional block system in the height direction to obtain the three-dimensional block system of coarse aggregate specifically includes the following steps:

repeating the operation to obtain a plurality of groups of samples to be selected of the coarse particle material three-dimensional block system;

selecting a coarse particle three-dimensional block system to-be-selected sample with the height within 1% of the error between the height and the real sample height from the multiple groups of coarse particle three-dimensional block system to-be-selected samples as a selected coarse particle three-dimensional block system;

preferably, the method for generating the coarse granule three-dimensional block system further comprises the following steps:

and under the condition that the coarse particle particles, the bottom constraint plate and the top loading plate are unchanged, dividing the side constraint plate into a plurality of sub constraint plates along the axial direction, wherein the height of each self constraint plate is smaller than that of the coarse particle particles.

8. A three-dimensional bulk system forming apparatus for coarse material, comprising:

the particle set obtaining module is used for obtaining a particle set which meets the grading requirement and is before the coarse particle three-dimensional block system is randomly thrown according to the grading requirement, and the total volume of the particle set is equal to that of a coarse particle sample to be thrown;

the device comprises a to-be-thrown region building module, a to-be-thrown region building module and a to-be-thrown region building module, wherein the shape of the bottom surface of the to-be-thrown region is the same as that of a three-dimensional block system of coarse aggregate to be generated, and the height of the to-be-thrown region is larger than that of the three-dimensional block system of coarse aggregate to be generated;

the random throwing module is used for throwing the particles in the particle set before the coarse particle material three-dimensional block system is randomly thrown into the area to be thrown under the control condition of the random throwing model to obtain the randomly thrown coarse particle material three-dimensional block system;

and the compaction module is used for compacting the randomly thrown three-dimensional block system in the height direction to obtain the coarse aggregate three-dimensional block system.

9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a control program of a three-dimensional bulk system generation method of coarse particles, which when executed by a processor, implements the steps of the three-dimensional bulk system generation method of coarse particles according to any one of claims 1 to 7.

10. A terminal device, characterized by comprising a memory and a processor, wherein the memory stores a control program of a coarse particle three-dimensional block system generation method, and the control program of the coarse particle three-dimensional block system generation method realizes the steps of the coarse particle three-dimensional block system generation method according to any one of claims 1 to 7 when being executed by the processor.

Technical Field

The invention relates to the technical field of virtual reality, in particular to a coarse particle material three-dimensional block system generation method, a coarse particle material three-dimensional block system generation device, a coarse particle material three-dimensional block system storage medium and coarse particle material three-dimensional block system equipment.

Background

The coarse particles are a non-viscous mixture, generally consist of coarse particles such as rock blocks, broken stones and stone chips, and are widely applied to earth-rock dams, highways and railway construction at present. Compared with in-situ or indoor tests, the coarse grain material numerical test has the advantages of being unique, such as freely building models with different sizes and different gradations, being not limited by test conditions, freely setting different boundary conditions and the like. Therefore, the gradation and mechanical properties and other characteristics of the coarse particles need to be studied.

Disclosure of Invention

In view of the above, the present invention provides a method, an apparatus, a storage medium, and a device for generating a coarse particle three-dimensional block system, which can strictly satisfy a method for constructing a coarse particle three-dimensional non-continuous Deformation Analysis (DDA) block system with a particle size distribution, and thus are more practical.

In order to achieve the first object, the invention provides a method for generating a three-dimensional block system of coarse granules, which comprises the following steps:

the method for generating the coarse granular material three-dimensional block system comprises the following steps:

according to the grading requirement, obtaining a particle set which meets the grading requirement and is before the coarse particle three-dimensional block system is randomly thrown, wherein the total volume of the particle set is equal to that of a coarse particle sample to be thrown;

constructing a region to be thrown, wherein the shape of the bottom surface of the region to be thrown is the same as that of the bottom surface of the coarse particle three-dimensional block system to be generated, and the height of the region to be thrown is greater than that of the coarse particle three-dimensional block system to be generated;

putting the particles in the particle set before the three-dimensional block system of the coarse aggregate is randomly put into the area to be put under the control condition of a random putting model to obtain the randomly put three-dimensional block system of the coarse aggregate;

and compacting the randomly thrown three-dimensional block system in the height direction to obtain the coarse granule three-dimensional block system.

The method for generating the coarse particle material three-dimensional block system can be further realized by adopting the following technical measures.

Preferably, in the step of obtaining a particle set before the three-dimensional bulk system of coarse particles meeting the grading requirement is randomly thrown according to the grading requirement, the coarse particles in each grading satisfy the following conditions:

wherein the content of the first and second substances,

V_iin the i-th gradation, the particle size lies inThe total volume of the coarse particles therein, wherein,-a set particle size of the i-th grading,-a set particle size of the i +1 th gradation;

V_g-the total volume of the coarse grain particle sample to be dosed;

in the i-th gradation, the particle diameter isAnd the volume content of the coarse particles smaller than the particle size is the percentage;

in the i +1 th gradation, the particle diameter isAnd is smaller thanThe volume content of the coarse particles with the particle size is percentage;

i is a natural number.

Preferably, the step of obtaining a particle set before randomly putting the coarse particle three-dimensional block system meeting the grading requirement according to the grading requirement specifically includes the following steps:

randomly extracting a particle from the reference morphology library and calculating its volumeAnd diameter D of the smallest circumscribed ball^s；

Calculating random size scalingControlling the particle size atWithin the range:

wherein the content of the first and second substances,

then, the volume of the particles after scalingCan be expressed as:

the particle size is positioned inOrFiltering out particles in the range;

repeating the operation until the particle size is withinTotal volume V of particles in the range_iCExceeds V for the first time_i(ii) a To make V_iC＝V_iThe size of all particles that have been generated can be scaled uniformly as follows:

wherein L is_rBetween 0.99 and 1.0.

Preferably, the method for acquiring vertex coordinate information of particles in a particle set before random distribution of the coarse particle three-dimensional block system comprises the following steps:

traversing all generated particles under the i-th gradation, firstly determining the centroid point of the particle m

Then determined by O_mDirection vector pointing to particle vertex j

Scaling the direction vector of each particle vertex in the same proportion;

randomly rotating the angle alpha, beta and gamma around the x, y and z axes by taking the centroid of each particle as a base point, and calculating the coordinate of the top point of the particle after scaling

Wherein the content of the first and second substances,

preferably, the area to be thrown in comprises a bottom restraint plate and a side restraint plate,

the radial section shape of the side restraining plate is the same as that of the bottom restraining plate,

the side restraining plates are fixedly connected to the outer edge of the bottom restraining plate through the bottom edges of the side restraining plates,

the axial height of the side restraining plate is larger than the height of a coarse particle material three-dimensional block system to be generated,

and forming the region to be thrown between the bottom restraint plate and the side restraint plate.

Preferably, the step of compacting in height direction for said randomly dosed three-dimensional mass system of coarse particles is performed by means of a compacting plate, wherein,

the shape of the compaction plate is the same as the radial cross section shape of the side restraint plate, and a moving pair along the axial direction of the side restraint plate is formed between the compaction plate and the inner wall of the side restraint plate.

Preferably, the step of compacting the randomly thrown three-dimensional block system in the height direction to obtain the three-dimensional block system of coarse aggregate specifically includes the following steps:

in the initial stage of compaction, calculating by adopting pure power;

and when the randomly thrown three-dimensional block system of the coarse granules is bottomed for the first time, applying dynamic calculation with damping.

Preferably, the step of feeding the particles in the particle set before the randomly feeding the three-dimensional bulk system of coarse particles to the region to be fed under the control condition of the random feeding model to obtain the randomly-fed three-dimensional bulk system of coarse particles specifically includes the following steps:

randomly putting the particles in the particle concentration before the coarse particle material three-dimensional block system is randomly put into the area to be put by taking the centroid as a base point;

according to the minimum circumscribed spherical radius and the spherical center point coordinates of the particles thrown into the area to be thrown, ensuring that the particles thrown into the area to be thrown are not overlapped with each other;

and repeating the operation until all the particles in the particle set before random putting are put into the system, thereby obtaining the randomly put coarse particle material three-dimensional block system.

Preferably, the randomly thrown three-dimensional block system is compacted in the height direction, and the coarse particle three-dimensional block system is obtained by a three-dimensional discontinuous deformation analysis method under the conditions of set loading step number, loading curve, single-step allowed maximum displacement ratio, time step length and damping.

Preferably, the step of compacting the randomly thrown three-dimensional block system in the height direction to obtain the three-dimensional block system of coarse aggregate specifically includes the following steps:

repeating the operation to obtain a plurality of groups of samples to be selected of the coarse particle material three-dimensional block system;

and selecting the coarse particle three-dimensional block system to-be-selected sample with the height within 1% of the error between the height and the real sample height from the multiple groups of coarse particle three-dimensional block system to-be-selected samples as the selected coarse particle three-dimensional block system.

Preferably, the method further comprises the following steps:

and under the condition that the coarse particle particles, the bottom constraint plate and the top loading plate are unchanged, dividing the side constraint plate into a plurality of sub constraint plates along the axial direction, wherein the height of each self constraint plate is smaller than that of the coarse particle particles.

In order to achieve the second object, the invention provides a device for generating a coarse particle three-dimensional block system, comprising:

the invention provides a coarse material three-dimensional block system generation device, which comprises:

the particle set obtaining module is used for obtaining a particle set which meets the grading requirement and is before the coarse particle three-dimensional block system is randomly thrown according to the grading requirement, and the total volume of the particle set is equal to that of a coarse particle sample to be thrown;

the device comprises a to-be-thrown region building module, a to-be-thrown region building module and a to-be-thrown region building module, wherein the shape of the bottom surface of the to-be-thrown region is the same as that of a three-dimensional block system of coarse aggregate to be generated, and the height of the to-be-thrown region is larger than that of the three-dimensional block system of coarse aggregate to be generated;

the random throwing module is used for throwing the particles in the particle set before the coarse particle material three-dimensional block system is randomly thrown into the area to be thrown under the control condition of the random throwing model to obtain the randomly thrown coarse particle material three-dimensional block system;

and the compaction module is used for compacting the randomly thrown three-dimensional block system in the height direction to obtain the coarse aggregate three-dimensional block system.

In order to achieve the third object, the invention provides a computer-readable storage medium having the following technical solutions:

the computer-readable storage medium provided by the invention stores a control program of the coarse particle three-dimensional block system generation method, and the control program of the coarse particle three-dimensional block system generation method realizes the steps of the coarse particle three-dimensional block system generation method provided by the invention when being executed by a processor.

In order to achieve the fourth object, the present invention provides an electronic device comprising:

the terminal equipment provided by the invention comprises a storage device and a processor, wherein the storage device is stored with a control program of the coarse particle three-dimensional block system generation method, and the control program of the coarse particle three-dimensional block system generation method realizes the steps of the coarse particle three-dimensional block system generation method provided by the invention when being executed by the processor.

The invention provides a coarse particle 3D-DDA block system construction method which strictly meets the grading requirement, aiming at the defect that the three-dimensional coarse particle system production performance which strictly meets the grading requirement does not exist in the coarse particle numerical test which is simulated and developed by using 3D-DDA. According to the method, polyhedral particles in an extracted reference library are obtained in a region of a to-be-thrown region according to the indoor test requirements of coarse particles, the requirements that no overlapping exists between the particles and the region boundary are met after random throwing, compaction operation is carried out based on a 3D-DDA method to obtain coarse particle models with particles in mutual contact and stable overall structures, and then the influence of uncertainty of a void ratio is eliminated through height adjustment to obtain the three-dimensional coarse particle models completely meeting the grading requirements.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic structural diagram of a three-dimensional bulk system of coarse aggregate which is randomly thrown into an area to be thrown under the control condition of a random throwing model, wherein the particles in a particle set before the three-dimensional bulk system of coarse aggregate is randomly thrown into the area to be thrown into the area;

fig. 2 is a schematic structural diagram of the randomly thrown three-dimensional block system compacted in the height direction to obtain the coarse material three-dimensional block system;

FIG. 3 is a schematic diagram illustrating an embodiment of a method for forming a coarse particle bulk system according to another embodiment of the present invention;

FIG. 4 is a flow chart illustrating the steps of a method for forming a three-dimensional bulk system of coarse particles according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a signal flow direction relationship between functional modules in a coarse particle three-dimensional block system generating device according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an operating device of a coarse particle three-dimensional block system generating device in a hardware operating environment according to an embodiment of the present invention.

Detailed Description

In view of the above, the present invention provides a method, an apparatus, a storage medium, and a device for generating a coarse particle three-dimensional block system, which can strictly satisfy a method for constructing a coarse particle three-dimensional non-continuous Deformation Analysis (DDA) block system with a particle size distribution, and thus are more practical.

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given of a method, an apparatus, a storage medium and a device for generating a three-dimensional block system of coarse particles according to the present invention, with reference to the accompanying drawings and preferred embodiments, and the detailed description thereof, the structure, the features and the effects thereof. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, with the specific understanding that: both a and B may be included, a may be present alone, or B may be present alone, and any of the three cases can be provided.

Method for producing three-dimensional block of coarse aggregate

Referring to fig. 1 to 4, a method for forming a three-dimensional block of coarse particles according to an embodiment of the present invention includes the following steps:

1. according to the particle geometric characteristics of the geotechnical sample, a plurality of representative particle reference forms can be generalized to jointly form a reference form library of the coarse material system. By carrying out a series of operations such as scaling and spatial random rotation on the particles in the library and by assisting with meeting the requirements of gradation, a particle set before random putting can be derived.

2. The coarse grain material sample selected for the geotechnical laboratory test is cylindrical, the diameter L is 300mm, and the height H is 600 mm. When the cylindrical area is just filled by the randomly thrown particle set which meets the grading and is generated in the step (1), the sample is successfully manufactured; the sample necessarily has a certain porosity.

3. To generate the demand of randomly putting in particle set, a 'supplier sample' is set, its diameter and coarse materialThe samples are consistent and are L, and the height is Ha; the total volume of the particle set is required to be equal to the volume Vg of the donor sample; wherein V_g＝π(L/2)²H_a. When a test coarse particle sample is formed for the first time, let H_a＝H。

4. According to the gradation of coarse-grained samples, e.g. the particle size of each gradationAnd the volume content of the particles smaller than the particle diameterCan determine the particle sizeTotal volume of particles V in the range_iComprises the following steps:

5. randomly extracting a particle from the reference morphology library, calculating its volume and diameter of the smallest circumscribed sphere, and recording asAnd Ds. Calculating random size scalingControlling the particle size atWithin the range:

then, the volume of the particles after scalingCan be expressed as:

in order to avoid that the gradation cannot be strictly satisfied because the particles very close to the critical particle size after the whole scaling in step (6) fall into the next-stage particle size group, the particle size may be set to be within the range ofOrParticles in the range are filtered out.

6. Repeating the operation in the step (5), and accumulating the volumes of the generated particles until the particle size is within the rangeTotal volume V of particles in the range_iCFirst exceeding the total volume V of the granules determined by grading_i. To make V_iC＝V_iThe size of all particles that have been generated can be scaled uniformly as follows:

lr is often between 0.99 and 1.0, so the filtration conditions in step (5) are reasonable.

7. Traversing all generated particles under the i-level composition, and firstly determining the centroid point of the particle mThen determined by O_mDirection vector pointing to particle vertex jScaling the direction vector of each particle vertex in the same proportion, randomly rotating the angle alpha, beta and gamma around the x, y and z axes by taking the particle centroid as a base point, and further calculating new coordinates of the particle vertex

Finally, the vertex coordinate information of all the particles under the grading is recorded.

8. And (4) sequentially carrying out the operations of the steps (4) to (7) on the residual grading, so that a coarse particle set strictly meeting the grading requirement can be generated, the spatial position of the particles in the particle set is still attached to the position of the particles in the reference library, and the random feeding operation of the particle set needs to be further carried out and is fed into the designated area.

9. The randomly dosed area is still cylindrical and has a diameter equal to that of the coarse grain sample, but the height is variable, defined as nxh, and n is a height magnification factor, which can be set according to the dosing efficiency and the number of particles. After the random dosing is completed, a compaction simulation based on DDA still needs to be performed to generate the required coarse grain sample. In order to meet the requirements of 3D-DDA calculation, relevant information such as the thickness, the diameter, the height and the like of a loading plate, a bottom constraint plate and a vertical hollow cylinder wrapping a random putting region still needs to be determined; meanwhile, the height of the particle set from the bottom restraint plate needs to be determined, so that a larger adjusting space is provided for the particle set, and the phenomenon of shell jamming in the compaction process is avoided. In order to accelerate the calculation efficiency, pure power calculation can be adopted in the initial stage; when the particle set touches the bottom for the first time, dynamic calculation with damping is applied to prevent the particle set from bouncing when touching the bottom.

10. And establishing a random putting model of the particle set. And randomly putting the particles into the cylindrical area by taking the centroid of the particles as a base point, and determining the initial positions of the particles. The principle of random feeding is that the feeding is carried out from a large-particle-size group to a small-particle-size group in sequence.

11. And determining the minimum circumscribed spherical radius and the spherical center point coordinates of the initially-thrown particles. Judging whether the external ball representing the particles is overlapped with the boundary of the cylindrical throwing area or the external ball thrown with the particles in place, and if not, successfully throwing; otherwise, turning to the step (10), and putting again until the non-overlapping requirement is met.

12. And (5) traversing each particle in the particle set, and completing the random putting work according to the operations of the steps (11) and (12). If the throwing is unsuccessful, the trial is carried out again by increasing the height amplification factor of the cylindrical random throwing area until the throwing is successful.

13. After the random feeding is finished, the geometric information (including points, lines, surfaces and bodies) of the coarse granular particles can be completely acquired; according to the geometric information of the top loading plate, the bottom constraint plate and the hollow cylinder and the spatial position relation of the random putting region, the DDA block information corresponding to the top loading plate, the bottom constraint plate and the hollow cylinder can be calculated.

14. And integrating the geometric information into a format of a DDA geometric file, and writing the DDA geometric file into a hard disk file through a write operation function.

15. Carrying out a compaction operation of the granules by using a three-dimensional discontinuous deformation analysis method (3D-DDA); and selecting proper calculation parameters, such as loading step number, loading curve, maximum displacement ratio allowed by single step, time step length, damping and the like. The height of the coarse grain sample formed after compaction is H_t。

16. According to step (2), the height of the coarse particle sample formed for the first timeIt is inevitable to satisfy: h_t>H, because there must be a gap between the particle contacts, i.e. the sample has a certain porosity. At H_tBased on the height H of a supplier sample_gA coarse particle system can be generated which approximately meets the requirements, and H_g＝H²/H_t。

17. Setting 2t groups of heights as H by taking delta as height interval_a＝H_gAnd (4) repeating the operations of the steps (2) to (15) on the supply sample of +/-t & delta to form a coarse granule compaction model of 2t group. The coarse particle model with the height closest to H is selected and this height is denoted as Ht. If the height error of the coarse particle sample and the sample is controlled within 1 percent or even lower, the preparation work of the coarse particle sample can be finished. Here, δ controls the accuracy of the solution, and the smaller the value and the larger the number of analog groups, the more accurate the sample is finally obtained.

18. If H is not contained in the upper and lower limits of the height of the coarse particle material sample of the 2t group, delta needs to be increased again, the operation of the step (17) is repeated, and the upper and lower limits of the height of the supply square sample are determined; then, on the basis, the precision is improved by reducing delta. This may be aided by using a dichotomy adjustment to gradually approximate the true specimen height.

19. Under the condition that the coarse particle particles, the bottom constraint plate and the top loading plate are unchanged, dividing the side constraint plate into a plurality of sub constraint plates along the axial direction, wherein the height of each sub constraint plate is smaller than that of the coarse particle particles. Referring to fig. 3, a is a coarse particle to be compacted, wherein the coarse particle is constrained therein by a bottom constraining plate and side constraining plates; b is the compacted coarse particle, wherein the coarse particle is constrained therein by a bottom constraining plate, a side constraining plate, and a top constraining plate; c is a schematic diagram after the side restraint plate is taken down on the basis of B; d1, D2, D3 and D4 are the sub-restraint plates after being divided; and E is a coarse particle system formed by coaxially superposing the sub-restraint plates D1, D2, D3 and D4 and coarse particles. The principle of improving the solving efficiency is that in the solving process, a rigidity matrix needs to be formed, wherein the size of the rigidity matrix bandwidth is related to the number of connections among the blocks, when the side constraint plate is an integral constraint plate, the number of coarse particles connected by the integral constraint plate is very large, and at the moment, the bandwidth of the rigidity matrix is also very large; however, after the side constraining plates are divided into the sub-constraining plates D1, D2, D3 and D4, the number of coarse particles associated with each sub-constraining plate is significantly reduced, and they can be independently calculated, so that the bandwidth of the overall stiffness matrix can be reduced, thereby improving the solution efficiency. By this, the construction of a coarse 3D-DDA block system strictly satisfying the particle grading is completely completed.

Coarse particle material three-dimensional block system generation device embodiment

Referring to fig. 5, the present invention provides a device for generating a three-dimensional bulk system of coarse particles, comprising:

the particle set obtaining module is used for obtaining a particle set which meets the grading requirement and is before the coarse particle three-dimensional block system is randomly thrown according to the grading requirement, and the total volume of the particle set is equal to that of a coarse particle sample to be thrown;

the device comprises a to-be-thrown region building module, a to-be-thrown region building module and a to-be-thrown region building module, wherein the shape of the bottom surface of the to-be-thrown region is the same as that of a three-dimensional block system of coarse aggregate to be generated, and the height of the to-be-thrown region is larger than that of the three-dimensional block system of coarse aggregate to be generated;

the random throwing module is used for throwing the particles in the particle set before the coarse particle material three-dimensional block system is randomly thrown into the area to be thrown under the control condition of the random throwing model to obtain the randomly thrown coarse particle material three-dimensional block system;

and the compaction module is used for compacting the randomly thrown three-dimensional block system in the height direction to obtain the coarse aggregate three-dimensional block system.

Electronic device embodiment

Referring to fig. 5, fig. 5 is a schematic structural diagram of an operating device of a method for generating a coarse grain three-dimensional block system in a hardware operating environment according to an embodiment of the present invention.

As shown in fig. 5, the operation equipment of the coarse granule three-dimensional block system generation method may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may comprise a Display screen Display, an input unit such as a Keyboard, and the optional user interface 1003 may also comprise a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface such as a WI-FI interface, for example, a WIreless FIdelity (WI-FI) interface. The Memory 1005 may be a high-speed Random Access Memory, a RAM Memory, or a Non-Volatile Memory, a NVM, such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.

Those skilled in the art will appreciate that the configuration shown in fig. 6 does not constitute a limitation on the equipment used to operate the coarse particulate three-dimensional bulk system generation process, and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components.

As shown in fig. 5, the memory 1005, which is a storage medium, may include therein an operating system, a data storage module, a network communication module, a user interface module, and an operating program of the coarse grain three-dimensional block system generating method.

In the operation device of the coarse particle three-dimensional block system generation method shown in fig. 5, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the operating device of the coarse particle three-dimensional block system generating method according to the present invention may be provided in the operating device of the coarse particle three-dimensional block system generating method, and the operating device of the coarse particle three-dimensional block system generating method calls the operating program of the coarse particle three-dimensional block system generating method stored in the memory 1005 through the processor 1001, and executes the operating method of the coarse particle three-dimensional block system generating method according to the embodiment of the present invention.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.