Detection system based on tunnel drilling and blasting construction and corresponding method thereof
阅读说明：本技术 一种基于隧道钻爆施工的探测系统及其对应方法 (Detection system based on tunnel drilling and blasting construction and corresponding method thereof ) 是由 李彦恒 胡明明 谭可可 操静滨 周辉 卢景景 谢耀权 李兆凯 胡明 高峰 于 2020-11-06 设计创作，主要内容包括：本发明实施例中公开了一种基于隧道钻爆施工的探测系统及其对应方法,其中,本实施例提供的系统包括第一探测子系统、第二探测子系统以及第三探测子系统,分别从垂直孔与掌子面、地表与掌子面以及掌子面后方微震监测系统三个方面对隧道周围的地质进行全方位探测,可以利用钻爆法施工中掌子面爆破波以及施工掘进时围岩中的微地震事件作为震源,不需要在震源上额外增加成本,可以利用前期地勘的垂直孔、掌子面爆破波、围岩中的微地震事件,进行全方位实时探测隧道施工过程中的隧道掌子面前后、轴向上方及地表的地层信息变化,能够提高地质勘察的探测深度和精度。(The embodiment of the invention discloses a detection system based on tunnel drilling and blasting construction and a corresponding method thereof, wherein, the system provided by the embodiment comprises a first detection subsystem, a second detection subsystem and a third detection subsystem which respectively carry out omnibearing detection on the geology around the tunnel from three aspects of a vertical hole and a tunnel face, a ground surface and the tunnel face and a micro-seismic monitoring system behind the tunnel face, the tunnel face blast wave in the drilling and blasting construction and the micro-seismic event in the surrounding rock during the construction and the tunneling can be used as the seismic source, the additional cost on the seismic source is not required, the vertical hole, the face blast wave and the micro-seismic event in the surrounding rock of the geological exploration in the earlier stage can be utilized to carry out all-round real-time detection on the stratum information changes of the front and back sides, the axial upper side and the earth surface of the tunnel face in the tunnel construction process, and the detection depth and the precision of the geological exploration can be improved.)
1. A detection system based on tunnel drilling and blasting construction is characterized by comprising: a first detection subsystem, a second detection subsystem, and a third detection subsystem, wherein:
the first detection subsystem comprises a plurality of string-type detectors, seismic wave acquisition equipment and a GPS time service device, the string-type detectors are respectively vertically and serially arranged in vertical holes arranged on the surface of a mountain body according to preset setting rules, the depth of each vertical hole exceeds the elevation of the axis of a tunnel, each vertical hole is a vertical hole arranged on the surface of the mountain body during early exploration, the string-type detectors are connected with the seismic wave acquisition equipment at a wellhead, the GPS time service device is arranged at a tunnel portal and is communicated with a support surface for determining the accurate time of blasting, and the seismic wave acquisition equipment is connected with the GPS time service device;
the second detection subsystem comprises a plurality of earth surface detectors, seismic wave acquisition equipment and the GPS time service device, the earth surface detectors are arranged on the earth surface corresponding to the tunnel in series according to preset length intervals, and the seismic wave acquisition equipment is connected with the earth surface detectors;
the third detection subsystem comprises a microseismic monitoring detector and a microseismic acquisition system, the microseismic monitoring detector is arranged in a drill hole in a certain range behind the tunnel face, the microseismic acquisition system is arranged at a tunnel opening, and the microseismic monitoring detector is connected with the microseismic acquisition system through a wire.
2. The detection system based on tunnel drilling and blasting construction according to claim 1, wherein the preset setting rules comprise: the string-type detector is arranged at an interval of 1m in the diameter range of the tunnel, at an interval of 3m in the range from the edge of the tunnel profile to the 100m of the tunnel axis, and at an interval of 10m outside the range from the edge of the tunnel profile to the 100m of the tunnel axis.
3. The tunneling-blast-based construction detection system according to claim 1, wherein the vertical hole is injected with a coupling agent.
4. The tunnel-based blast construction detection system of claim 1, wherein said surface geophones are positioned 20cm below said surface.
5. The detection system based on tunnel drilling and blasting construction of claim 4, wherein the surface detector is a highly integrated detector.
6. The detection system based on tunnel drilling and blasting construction of claim 1, wherein the string detector is a highly integrated detector.
7. The detection system based on tunnel drilling and blasting construction according to claim 1, wherein the preset length interval is 2-5 m.
8. A detection method based on tunnel drilling and blasting construction, which is used for the system of any one of claims 1-7, and is characterized by comprising the following steps:
the use method of the first detection subsystem comprises the following steps:
setting acquisition parameters of the seismic wave acquisition equipment;
when the chaplet surface is blasted, the seismic wave acquisition equipment acquires seismic waves generated by blasting through the string detectors;
the GPS time service device is communicated with the chaplet surface, and the blasting time of the chaplet surface is automatically determined;
the seismic wave acquisition equipment acquires the blasting time through the GPS time service device;
according to the space positions of the prop surface and the string detectors, the seismic waves and the blasting time, utilizing a seismic wave tomography method to calculate the wave velocity structure of the stratum on the axis between the tunnel face and the vertical hole in an inversion mode, predicting the geological condition in front of the axis and obtaining first detection information;
the use method of the second detection subsystem comprises the following steps:
setting acquisition parameters of the seismic wave acquisition equipment;
when the chaplet surface is blasted, the seismic wave acquisition equipment receives surface seismic waves generated by blasting through the surface geophone;
the GPS time service device is communicated with the chaplet surface, and the blasting time of the chaplet surface is automatically determined;
the seismic wave acquisition equipment acquires the blasting time through a GPS time service device;
according to the space positions of the prop surface and the earth surface geophone, the earth surface seismic waves and the blasting time, utilizing a seismic wave tomography method to calculate the wave velocity structure of the stratum on the axis between the tunnel face and the earth surface in an inversion mode, predicting the geological condition in front of the axis and obtaining second detection information;
the use method of the third detection subsystem comprises the following steps:
when the prop surface is constructed and tunneled, a large amount of micro-shock can be generated in surrounding rocks near the tunnel face, and the micro-shock acquisition system acquires micro-shock waves through the micro-shock monitoring detector;
according to the acquired micro-seismic waves and the spatial position of the micro-seismic monitoring detector, inverting the spatial position of the micro-seismic event, the mechanical solution of the seismic source and the magnitude of the seismic level by using a seismic source double-difference positioning technology;
according to the collected micro-seismic waves and the spatial position of the micro-seismic monitoring detector, on the premise of more events and wider distribution, utilizing a seismic wave tomography method to invert the wave velocity structure of the surrounding rock between a seismic source and the micro-seismic monitoring detector, estimating the damage state and the quality grading of the surrounding rock by combining the early-stage geological exploration result, estimating the stable state of the surrounding rock according to the spatial position of the micro-seismic events and the magnitude of the seismic grade, predicting rock burst and obtaining third detection information;
and obtaining a detection result according to the first detection information, the second detection information and the third detection information.
9. The detection method based on tunnel drilling and blasting construction according to claim 8, wherein the acquiring parameters comprises: sampling rate, sampling length, threshold value and alarm value.
10. The detection method based on the tunnel drilling and blasting construction, according to claim 8, wherein after the seismic wave collection device collects the seismic waves generated by the blasting through the string-type geophone, the method further comprises:
the seismic wave acquisition equipment judges whether the waveform corresponding to the seismic wave is an invalid waveform;
and if so, cutting off the seismic waves corresponding to the invalid waveforms.
Technical Field
The invention relates to the technical field of seismic wave detection in tunnel construction, in particular to a detection system based on tunnel drilling and blasting construction and a corresponding method thereof.
Background
With more and more deep-buried long and large tunnel projects in western mountainous areas in China, the geological conditions of the projects are more and more complex, and the problems of active faults, high ground stress, high ground temperature, high groundwater and the like are faced.
In the early-stage geological exploration of underground engineering in many mountainous areas, besides full-axis geophysical prospecting and engineering ground adjustment, a small number of vertical holes are arranged on the earth surface above the axis for drilling, so that the geological condition of a certain point of the axis is directly revealed and the geophysical prospecting result is verified, and even if the geological condition of the axis is difficult to accurately find out, great uncertainty and potential safety hazard are brought to design and construction; and the construction geological survey is usually realized by geological sketch, advanced drilling and comprehensive geophysical prospecting near the tunnel face, the forecasting distance is short, and the effect is general.
Among three main geophysical prospecting methods, namely a seismic wave method, an electrical method and an electromagnetic method, the seismic wave detection precision is highest, an inversion section is most visual, and in the early-stage prospecting, the method is limited by seismic source energy, and the detection depth and the detection precision cannot meet the requirements of fine geological prospecting.
Disclosure of Invention
The embodiment of the invention provides a detection system based on tunnel drilling and blasting construction and a corresponding method thereof, which can improve the detection depth and precision of geological exploration.
In one aspect, the present invention provides a detection system based on tunnel drilling and blasting construction, the system comprising: a first detection subsystem, a second detection subsystem, and a third detection subsystem, wherein:
the first detection subsystem comprises a plurality of string-type detectors, seismic wave acquisition equipment and a GPS time service device, the string-type detectors are respectively vertically and serially arranged in vertical holes arranged on the surface of a mountain body according to preset setting rules, the depth of each vertical hole exceeds the elevation of the axis of a tunnel, each vertical hole is a vertical hole arranged on the surface of the mountain body during early exploration, the string-type detectors are connected with the seismic wave acquisition equipment at a wellhead, the GPS time service device is arranged at a tunnel portal and is communicated with a support surface for determining the accurate time of blasting, and the seismic wave acquisition equipment is connected with the GPS time service device;
the second detection subsystem comprises a plurality of earth surface detectors, seismic wave acquisition equipment and the GPS time service device, the earth surface detectors are arranged on the earth surface corresponding to the tunnel in series according to preset length intervals, and the seismic wave acquisition equipment is connected with the earth surface detectors;
the third detection subsystem comprises a microseismic monitoring detector and a microseismic acquisition system, the microseismic monitoring detector is arranged in a drill hole in a certain range behind the tunnel face, the microseismic acquisition system is arranged at a tunnel opening, and the microseismic monitoring detector is connected with the microseismic acquisition system through a wire.
In some embodiments, the preset setting rules include: the string-type detector is arranged at an interval of 1m in the diameter range of the tunnel, at an interval of 3m in the range from the edge of the tunnel profile to the 100m of the tunnel axis, and at an interval of 10m outside the range from the edge of the tunnel profile to the 100m of the tunnel axis.
In some embodiments, the vertical bore is impregnated with a coupling agent.
In some embodiments, the geophone is positioned 20cm below the subsurface.
In some embodiments, the surface detector is a highly integrated detector.
In some embodiments, the string detector is a highly integrated detector.
In some embodiments, the preset length interval is 2-5 m.
In another aspect, the present invention further provides a detection method based on tunnel drilling and blasting construction, where the method is used for using a detection system for tunnel drilling and blasting construction, and includes:
the use method of the first detection subsystem comprises the following steps:
setting acquisition parameters of the seismic wave acquisition equipment;
when the chaplet surface is blasted, the seismic wave acquisition equipment acquires seismic waves generated by blasting through the string detectors;
the GPS time service device is communicated with the chaplet surface, and the blasting time of the chaplet surface is automatically determined;
the seismic wave acquisition equipment acquires the blasting time through the GPS time service device;
according to the space positions of the prop surface and the string detectors, the seismic waves and the blasting time, utilizing a seismic wave tomography method to calculate the wave velocity structure of the stratum on the axis between the tunnel face and the vertical hole in an inversion mode, predicting the geological condition in front of the axis and obtaining first detection information;
the use method of the second detection subsystem comprises the following steps:
setting acquisition parameters of the seismic wave acquisition equipment;
when the chaplet surface is blasted, the seismic wave acquisition equipment receives surface seismic waves generated by blasting through the surface geophone;
the GPS time service device is communicated with the chaplet surface, and the blasting time of the chaplet surface is automatically determined;
the seismic wave acquisition equipment acquires the blasting time through a GPS time service device;
according to the space positions of the prop surface and the earth surface geophone, the earth surface seismic waves and the blasting time, utilizing a seismic wave tomography method to calculate the wave velocity structure of the stratum on the axis between the tunnel face and the earth surface in an inversion mode, predicting the geological condition in front of the axis and obtaining second detection information;
the use method of the third detection subsystem comprises the following steps:
when the prop surface is constructed and tunneled, a large amount of micro-shock can be generated in surrounding rocks near the tunnel face, and the micro-shock acquisition system acquires micro-shock waves through the micro-shock monitoring detector;
according to the acquired micro-seismic waves and the spatial position of the micro-seismic monitoring detector, inverting the spatial position of the micro-seismic event, the mechanical solution of the seismic source and the magnitude of the seismic level by using a seismic source double-difference positioning technology;
according to the collected micro-seismic waves and the spatial position of the micro-seismic monitoring detector, on the premise of more events and wider distribution, utilizing a seismic wave tomography method to invert the wave velocity structure of the surrounding rock between a seismic source and the micro-seismic monitoring detector, estimating the damage state and the quality grading of the surrounding rock by combining the early-stage geological exploration result, estimating the stable state of the surrounding rock according to the spatial position of the micro-seismic events and the magnitude of the seismic grade, predicting rock burst and obtaining third detection information;
and obtaining a detection result according to the first detection information, the second detection information and the third detection information.
In some embodiments, the acquisition parameters include: sampling rate, sampling length, threshold value and alarm value.
In some embodiments, after the seismic wave collecting device collects the seismic waves generated by the blasting through the string geophone, the method further comprises:
the seismic wave acquisition equipment judges whether the waveform corresponding to the seismic wave is an invalid waveform;
and if so, cutting off the seismic waves corresponding to the invalid waveforms.
The invention has the advantages that the tunnel face blast wave in the drilling and blasting construction and the micro-seismic events in the surrounding rock during the construction and the tunneling can be used as the seismic source, the additional cost on the seismic source is not needed, the vertical hole, the tunnel face blast wave and the micro-seismic events in the surrounding rock in the early stage of geological exploration can be used for comprehensively detecting the stratum information changes of the front part, the back part, the axial upper part and the ground surface of the tunnel face in the tunnel construction process in real time, and the detection depth and the precision of geological exploration can be improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a detection system based on tunnel drilling and blasting construction provided by the embodiment of the invention;
FIG. 2 is a schematic diagram of a third detection subsystem in an embodiment of the invention;
FIG. 3 is a schematic flow chart illustrating the use of a first detection subsystem in an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating the use of a second detection subsystem in an embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating the use of a third detection subsystem in an embodiment of the present invention;
FIG. 6 is a schematic diagram of an application scenario and an overall flow of the system according to an embodiment of the present invention;
in the figure: a prop surface 11, a seismic source 12, seismic waves 13, a vertical hole 14, a tunnel hole 15 and a borehole 16; the system comprises a string type detector 21, seismic wave acquisition equipment 22, a GPS time service device 23, a surface detector 24, a microseismic monitoring detector 25, a microseismic acquisition system 26 and a lead 27.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present disclosure, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
The embodiment of the invention provides a detection system based on tunnel drilling and blasting construction, wherein,
the tunnel face tunneling blasting energy is large in the drilling and blasting method construction, the advantages of the tunnel face tunneling blasting energy serving as a seismic source for seismic wave detection are obvious, and the seismic source does not need to increase the cost and is a 'natural' source. In addition, the disturbance of construction tunneling on the in-situ stress of the surrounding rock, a large number of micro seismic events generated in the surrounding rock near the tunnel face can also be used as seismic sources for seismic wave detection, meanwhile, the 'natural' seismic waves can directly bring geological information required by design and construction, such as a ground stress field of the surrounding rock, a surrounding rock speed structure and the like, and in addition, in the early-stage geological exploration of underground engineering in many mountainous areas, besides full-axis geophysical prospecting and engineering ground tone, a small number of vertical holes are arranged on the ground surface above the axis for drilling.
According to the invention, the energy generated by the blasting of the strut surface and the construction and tunneling of the strut surface can be used as a seismic source, and the vertical hole arranged in the geological survey can be used as a detection position, so that the detection cost is saved.
As shown in fig. 1, fig. 1 provides a detection system based on tunnel drilling and blasting construction for an embodiment of the present invention, and the system includes: a first detection subsystem, a second detection subsystem, and a third detection subsystem:
the present embodiment uses the burst of the chaplet surface 11 as the seismic source 12, and propagates in the rock body in the form of seismic waves 13, wherein:
the first detection subsystem in the invention is a seismic wave detection system based on a vertical hole and a tunnel face, and comprises a plurality of string detectors 21, seismic wave acquisition equipment 22 and a GPS time service device 23, wherein the string detectors 21 are respectively vertically and serially arranged in a vertical hole 14 arranged on the surface of a mountain body according to a preset setting rule, the depth of the vertical hole 14 exceeds the axial elevation of a tunnel 15, the vertical hole 14 is the vertical hole 14 arranged on the surface of the mountain body in early exploration, the string detectors 21 are connected with the seismic wave acquisition equipment 22 at a wellhead, the GPS time service device 23 is arranged at a tunnel portal and is communicated with a support face 11 for determining the accurate time of blasting, and the seismic wave acquisition equipment 22 is connected with the GPS time service device 23.
In this embodiment, the connection between the seismic wave acquisition device 22 and the GPS time service device 23 may be wireless or wired, and the specific connection is not limited here.
In some embodiments, the rule of placement of the string detector 21 in the vertical bore 14 may be: the string-type detectors 21 are arranged at intervals of 1m within the diameter range of the tunnel 15, at intervals of 3m within the range from the edge of the tunnel profile to the axis of the tunnel 100m, at intervals of 10m outside the range from the edge of the tunnel profile to the axis of the tunnel 100m, the specific situation is determined according to the buried depth of the tunnel 15, and the setting rule is not limited at the position.
In some embodiments, for better reception of the seismic waves 13, a coupling agent is injected in the vertical bore 14 to reduce attenuation of the seismic waves 13.
In some embodiments, the string detector 21 is a highly integrated detector, which can realize automatic acquisition, storage and data transmission, and the seismic wave acquisition device 22 is an automatic real-time seismic wave acquisition device.
The second detection subsystem in the invention is an earth surface and tunnel face seismic wave detection system, and specifically comprises a plurality of earth surface detectors 24, seismic wave acquisition equipment 22 and a GPS time service device 23, wherein the plurality of earth surface detectors 24 are arranged on the earth surface corresponding to the tunnel in series according to a preset length interval, and the seismic wave acquisition equipment is connected with the earth surface detectors, wherein the seismic wave acquisition equipment 22 and the GPS time service device 23 can be shared by the first detection subsystem and the second detection subsystem.
In some embodiments, the preset length interval is 2-5m, i.e., the trace spacing of the geophones 24 at the surface may be 2m to 5m, such as 3m, with the specific interval length not being limited herein.
In the present embodiment, the geophone 24 is disposed on a certain area of the ground surface, for example, on the top of a mountain in front of the stretcher surface.
In the embodiment, the surface detector 24 is a highly integrated detector, and can realize automatic acquisition, storage and data transmission;
in some embodiments, the geophones 24 are buried 20cm into the earth for better reception of the seismic waves 13, so as to reduce attenuation of the seismic waves 13, although in other embodiments, the geophones 24 may be buried at other depths, such as 25cm, as the case may be, and the specific depth is not limited herein.
The third detection subsystem in the present invention is a back-of-tunnel microseismic monitoring system, which includes a microseismic monitoring detector 25 and a microseismic collecting system 26, as shown in fig. 2, fig. 2 is an enlarged view of the third detection subsystem in fig. 1, a certain number of drill holes 16 are arranged in a certain range (for example, 5m) behind the tunnel face 11 in the present embodiment, the microseismic monitoring detector 25 is arranged in the drill hole 16 behind the tunnel face 11, the microseismic collecting system 26 is arranged at a tunnel opening, and the microseismic monitoring detector 25 is connected with the microseismic collecting system 26 through a lead 27.
In order to better implement the detection system method based on the tunnel drilling and blasting construction provided by the embodiment of the application, the embodiment of the application also provides a method based on the detection system based on the tunnel drilling and blasting construction. The terms are the same as those in the detection system based on tunnel drilling and blasting construction, and specific implementation details can refer to the description in the system embodiment.
Referring to fig. 3 to 5, the present invention provides a detection method based on tunnel drilling and blasting construction, which is an embodiment of a detection system based on tunnel drilling and blasting construction, and specifically includes a use method of a first detection subsystem, a use method of a second detection subsystem, and a use method of a third detection subsystem, as follows:
as shown in fig. 3, the first detection subsystem is used by the following method:
101. and setting acquisition parameters of the seismic wave acquisition equipment.
Specifically, before detection, acquisition parameters are required to be set, and the acquisition parameters include a sampling rate, a sampling length, a threshold value, an alarm value and the like.
Wherein, through the prior investigation, vertical holes are arranged on the surface of the mountain, and the drilling depth exceeds a certain depth below the axis elevation of the tunnel.
102. When the chaplet surface is blasted, the seismic wave collecting equipment collects seismic waves generated by blasting through the string detectors.
In this embodiment, the string detectors are placed in the vertical hole, and within the range of the diameter of the tunnel, the distance between the detectors is 1m, the distance between the edge of the profile of the tunnel 1 and the axis of the tunnel is 3m within 100m, the distance between the edge of the profile of the tunnel 1 and the axis of the tunnel is 10m outside the 100m range, and the specific situation is determined according to the buried depth of the tunnel 1.
Because the string-type geophone is arranged in the vertical hole and is connected with the seismic wave acquisition equipment, the seismic wave acquisition equipment can receive the seismic waves detected by the string-type geophone.
The seismic wave acquisition equipment provided by the embodiment is seismic wave automatic real-time acquisition equipment, can set acquisition parameters, issue instructions, display and store data, can automatically collect seismic waves generated by face blasting, automatically remove invalid waveform records and store valid records.
When the tunnel face is blasted, a blasting seismic source is generated and is transmitted in the rock body in the form of seismic waves, the string-type geophone receives the seismic waves, and the string-type geophone is connected with seismic wave acquisition equipment at a wellhead.
103. The GPS time service device is communicated with the chaplet surface, and the blasting time of the chaplet surface is automatically determined.
In this embodiment, the GPS time service device may be configured to communicate with the face of the chaplet, so that the accurate blasting time of the face of the chaplet may be determined.
104. The earthquake wave acquisition equipment acquires the blasting time through the GPS time service device.
105. And according to the space positions of the prop surface and the string detectors, the seismic waves and the blasting time, utilizing a seismic wave tomography method to calculate the wave velocity structure of the stratum on the axis between the tunnel face and the vertical hole in an inversion mode, predicting the geological condition in front of the axis, and obtaining first detection information.
The seismic wave acquisition equipment acquires seismic waves generated when the chaplet face explodes according to the received explosion time of the chaplet face and the collected seismic waves, and then, by combining the positions (the spatial positions of the chaplet face and the string detectors) for detecting the seismic waves, the seismic wave tomography method can be used for calculating the wave velocity structure of the stratum on the axis between the tunnel face and the vertical hole in an inversion mode, predicting the geological condition in front of the axis, and obtaining first detection information, wherein the first detection information comprises the predicted information of the geological condition in front of the axis, and the information can play a role in early warning.
As shown in fig. 4, the second detection subsystem is used by the following method:
201. and setting acquisition parameters of the seismic wave acquisition equipment.
In the embodiment, the surface detector is a highly integrated detector, and can realize automatic acquisition, storage and data transmission; for better reception of seismic waves, geophones may be buried 20cm into the earth to reduce attenuation of the seismic waves.
The acquisition parameters can be sampling rate, sampling length, threshold value, alarm value and the like, and in addition, the acquisition parameters can be set, instructions can be issued, and data can be displayed and stored.
The seismic wave acquisition equipment in the embodiment can automatically collect seismic waves generated by tunnel face blasting, automatically cut off invalid waveform records and store valid records.
202. When the chaplet surface is blasted, the seismic wave acquisition equipment receives surface seismic waves generated by blasting through the surface geophone.
In this embodiment, when the tunnel face is blasted, a blasting seismic source is generated and propagates in the rock in the form of seismic waves, the surface geophone receives the seismic waves, and the surface geophone is connected with the seismic wave acquisition equipment and sends the acquired seismic waves to the seismic wave acquisition equipment.
203. The GPS time service device is communicated with the chaplet surface, and the blasting time of the chaplet surface is automatically determined.
204. The earthquake wave acquisition equipment acquires the blasting time through the GPS time service device.
205. And according to the space positions of the prop surface and the earth surface detector, earth surface seismic waves and the blasting time, carrying out inversion calculation on the wave velocity structure of the stratum on the axis between the tunnel face and the earth surface by using a seismic wave tomography method, predicting the geological condition in front of the axis, and obtaining second detection information.
The second detection information in this embodiment reflects the geological condition ahead of the axis, and this information can play a role of early warning.
As shown in fig. 5, the third detection subsystem is used in the following manner:
301. when the prop face is constructed and tunneled, a large amount of micro-shock can be generated in surrounding rocks near the tunnel face, and the micro-shock acquisition system acquires micro-shock waves through the micro-shock monitoring detector.
In the embodiment, a certain number of drill holes are arranged in a certain range behind the tunnel face, the micro-seismic monitoring detectors are arranged in the drill holes, the micro-seismic monitoring detectors are connected with a micro-seismic acquisition system through a lead, waveform recording is automatically acquired and stored, and micro-seismic events occurring in the surrounding rock are recorded in real time.
302. And according to the acquired micro-seismic waves and the spatial position of the micro-seismic monitoring detector, inverting the spatial position of the micro-seismic event, the mechanical solution of the seismic source and the magnitude of the seismic level by using a seismic source double-difference positioning technology.
303. According to the collected micro-seismic waves and the spatial positions of the micro-seismic monitoring detectors, on the premise of more events and wider distribution, a seismic wave tomography method is used for inverting the wave velocity structure of the surrounding rock between the seismic source and the micro-seismic monitoring detectors, the damage state and the quality grading of the surrounding rock are estimated by combining the early-stage geological exploration result, the stable state of the surrounding rock is estimated according to the spatial positions and the magnitude of the seismic grades of the micro-seismic events, the rock burst is predicted, and third detection information is obtained.
The third detection information contains the prediction information of the rock burst, and an early warning effect can be achieved.
Finally, with reference to the first detection information, the second detection information, and the third detection information obtained in the embodiments corresponding to fig. 3, fig. 4, and fig. 5, the detection result is obtained according to the first detection information, the second detection information, and the third detection information.
The detection result plays a role in integral early warning, and when the geological condition is determined to be in problem according to the prediction result, the system can send alarm information.
To integrally understand the detection system based on tunnel drilling and blasting construction and the corresponding method in this embodiment, please refer to fig. 6, and fig. 6 is a schematic view of an application scenario and an overall flow of the system in this embodiment.
The invention has the advantages that the tunnel face blast wave in the drilling and blasting construction and the micro-seismic events in the surrounding rock during the construction and the tunneling can be used as the seismic source, the additional cost on the seismic source is not needed, the vertical hole, the tunnel face blast wave and the micro-seismic events in the surrounding rock in the early stage of geological exploration can be used for comprehensively detecting the stratum information changes of the front part, the back part, the axial upper part and the ground surface of the tunnel face in the tunnel construction process in real time, and the detection depth and the precision of geological exploration can be improved.
The detection system based on tunnel drilling and blasting construction and the corresponding method thereof provided by the embodiment of the invention are described in detail, a specific embodiment is applied in the description to explain the principle and the embodiment of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.