Indoor model for monitoring settlement deformation of reinforced soil by utilizing annular runway

文档序号:1962795 发布日期:2021-12-14 浏览:13次 中文

阅读说明:本技术 利用环形跑道监测加筋土沉降变形的室内模型 (Indoor model for monitoring settlement deformation of reinforced soil by utilizing annular runway ) 是由 董彦莉 张梦琪 郑利锋 赵致艺 张晓双 冯浩然 吕沛松 杨玲琴 张兆鹏 王元龙 于 2021-09-23 设计创作,主要内容包括:本发明公开了一种利用环形跑道监测加筋土沉降变形的室内模型,属于岩土工程与地质工程试验技术领域;包括模型箱,加筋土,小车系统,测量系统和图像拍摄装置;模型箱为环形箱体,环形箱体水平平行两边的外侧为透明体,所述加筋土位于模型箱内;加筋土的表面设置有环形跑道;小车系统位于环形跑道上运行,测量系统包括应变计、土压力盒和计算机;土压力盒成对竖向分布在加筋材料的上下两侧,每层加筋材料上均水平设置应变计;应变计和土压力盒通过附加在其上的传感器将数据传送至计算机进行处理;本发明利用了环形跑道使小车在上保持匀速运动,模拟循环往复运动,可以加快效率,有效模拟实际交通状况。(The invention discloses an indoor model for monitoring the settlement deformation of reinforced soil by utilizing an annular runway, belonging to the technical field of geotechnical engineering and geological engineering tests; the system comprises a model box, reinforced soil, a trolley system, a measuring system and an image shooting device; the model box is an annular box body, the outer sides of the two horizontal parallel sides of the annular box body are transparent bodies, and the reinforced soil is positioned in the model box; an annular runway is arranged on the surface of the reinforced soil; the trolley system runs on the annular runway, and the measuring system comprises a strain gauge, a soil pressure cell and a computer; the earth pressure cells are vertically distributed on the upper side and the lower side of the reinforced material in pairs, and strain gauges are horizontally arranged on each layer of reinforced material; the strain gauge and the soil pressure cell transmit data to a computer for processing through a sensor attached to the strain gauge and the soil pressure cell; the invention utilizes the annular runway to ensure that the trolley keeps uniform motion on the upper part, simulates the circular reciprocating motion, can accelerate the efficiency and effectively simulate the actual traffic condition.)

1. The indoor model for monitoring the settlement deformation of the reinforced soil by using the annular runway is characterized by comprising a model box (1), the reinforced soil (2), a trolley system (3), a measuring system (4) and an image shooting device;

the model box (1) is an annular box body, the outer sides of the two horizontal parallel sides of the annular box body are transparent bodies, and scales are arranged on the transparent bodies; the reinforced soil (2) is filled with one or more layers of reinforced materials (6), and the reinforced soil (2) is positioned in the model box (1); an annular runway (10) is arranged on the surface of the reinforced earth (2);

the trolley system (3) runs on the annular runway (10), and a weight block (7) is arranged on the trolley system (3) in a counterweight manner;

the measuring system (4) comprises a strain gauge, an earth pressure cell (9) and a computer (11); the soil pressure boxes (9) are vertically distributed on the upper side and the lower side of the reinforced material (6) in pairs, and strain gauges are horizontally arranged on each layer of reinforced material (6); the strain gauge and the soil pressure box (9) transmit data to a computer (11) through a sensor attached to the strain gauge and the soil pressure box for processing;

the image shooting device is opposite to the horizontal edge of the model box (1).

2. The indoor model for monitoring the settlement deformation of the reinforced soil by using the annular runway according to claim 1, wherein reinforced materials of different materials are respectively added to two horizontal edges of the model box (1) to simulate different road surfaces for testing.

3. The indoor model for monitoring the settlement deformation of reinforced soil by using the annular runway according to claim 1, characterized in that the vehicle-mounted sensor and the speed sensor are mounted on the vehicle system (3), the vehicle-mounted sensor and the speed sensor transmit signals to the computer (11), and the autonomous movement and speed of the vehicle system (3) on the annular runway (10) are controlled by the computer (11).

4. The indoor model for monitoring the settlement deformation of reinforced earth by using the annular runway according to claim 1, characterized in that the trolley system (3) is provided with a circulating device, and the number of the circulating times of the trolley system (3) is controlled by the computer (11).

5. The indoor model for monitoring the settlement deformation of reinforced soil by using the annular runway according to claim 1, characterized in that the annular runway (10) is provided with positioning rods (8), the trolley system (3) is provided with laser emitting units, and the laser emitting units are used for sweeping the positioning rods (8) so as to record the cycle number of the trolley system (3).

6. The indoor model for monitoring the settlement deformation of the reinforced soil by using the annular runway according to claim 1, wherein the model box (1) is made of toughened glass.

Technical Field

The invention belongs to the technical field of geotechnical engineering and geological engineering tests, and particularly relates to an indoor model for monitoring settlement deformation of reinforced soil by using an annular runway.

Background

The soil body has higher compressive strength and poorer tensile strength. A certain amount of the reinforced materials are doped into the soil body, so that the strength and the deformation characteristics of the soil body can be improved to different degrees, and the technology is called reinforced soil technology. The reinforced earth technology is also gradually applied to various road beds and pavements. With the increasing of trucks and private cars, the roadbed bears more and more load, which directly results in the damage of the roadbed and the early damage of the road surface. Therefore, it is necessary to monitor the settlement deformation of the reinforced earth of different road beds by simulating traffic load.

Most of the existing traffic load devices adopt single-shaft fixed-point vertical loading, but the actual road surface always experiences horizontal repeated movement of vehicles, and the single-shaft fixed-point vertical loading devices cannot accurately monitor the influence of the vehicles on the road surface; secondly, most of the existing model tests are small-scale size models, and are influenced by material similarity and a dynamic loading model, and the experimental structure is greatly different from the actual working condition.

Disclosure of Invention

The invention overcomes the defects of the prior art, provides an indoor model for monitoring the settlement deformation of reinforced soil by using an annular runway, and uses the annular runway to make a trolley perform a circular reciprocating motion and can perform different loading to simulate the actual traffic load so as to obtain the strain deformation of a reinforced material and the fatigue damage of a roadbed and a road surface.

In order to achieve the purpose, the invention is realized by the following technical scheme:

an indoor model for monitoring the settlement and deformation of reinforced earth by using an annular runway comprises a model box, the reinforced earth, a trolley system, a measuring system and an image shooting device.

The model box is an annular box body, the outer sides of the two horizontal parallel sides of the annular box body are transparent bodies, and scales are arranged on the transparent bodies; the reinforced soil is filled with one or more layers of reinforced materials, and the reinforced soil is positioned in the model box; an annular runway is arranged on the surface of the reinforced earth.

The trolley system runs on the annular runway, and a weight block is arranged on the trolley system in a counterweight mode.

The measuring system comprises a strain gauge, a soil pressure cell and a computer; the earth pressure cells are vertically distributed on the upper side and the lower side of the reinforced material in pairs, and strain gauges are horizontally arranged on each layer of reinforced material; the strain gauge and the soil pressure cell transmit data to a computer for processing through a sensor attached to the strain gauge and the soil pressure cell;

the image shooting device is opposite to the horizontal edge of the model box.

Preferably, reinforced materials made of different materials are respectively added to two horizontal edges of the model box to simulate different road surfaces for testing.

Preferably, the trolley system is provided with a vehicle-mounted sensor and a speed sensor, the vehicle-mounted sensor and the speed sensor transmit signals to the computer, and the computer controls the autonomous movement and speed of the trolley system on the annular runway.

Preferably, the trolley system is provided with a circulating device, and the circulating times of the trolley system are controlled by the computer.

Furthermore, the annular runway is provided with a positioning rod, the trolley system is provided with a laser emission unit, and the laser emission unit is used for sweeping the positioning rod so as to record the cycle number of the trolley system.

Furthermore, the model box is made of toughened glass.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention utilizes the annular runway, can ensure that the trolley keeps uniform motion on the ground, more vividly simulates the circular reciprocating motion in reality, can accelerate the efficiency and effectively simulate the actual traffic condition.

2. The trolley system can input control speed and cycle times on a computer to enable the trolley to complete reciprocating and cyclic motion, and can place counter weights with different weights on the trolley to achieve different loads, so that the operation is convenient and rapid.

3. The model box can be simultaneously added with different reinforced materials or simulate different pavements to carry out parallel experiments, thereby greatly saving time and improving efficiency.

Drawings

FIG. 1 is a schematic structural diagram of the model of the present invention.

Fig. 2 is a perspective view of the model of the present invention.

In the figure, 1 is a model box, 2 is reinforced earth, 3 is a trolley system, 4 is a measuring system, 5 is a high-speed camera, 6 is reinforced material, 7 is a weight, 8 is a positioning rod, 9 is an earth pressure cell, 10 is an annular runway, and 11 is a computer.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.

As shown in fig. 1 and 2, the present embodiment is an indoor model for monitoring reinforced earth settlement deformation by applying traffic load on an annular runway, and the indoor model comprises a model box 1, reinforced earth 2, a trolley system 3, a measurement system 4 and a high-speed camera 5.

The model box 1 is an annular box body, and the outer sides of the horizontal parallel two sides of the annular box body are transparent and marked with centimeter scales. The length of the horizontal edge is 20m, the two arc-shaped edges are respectively in a circle with a radius of one half of 4m, and the width of the runway is 1.5 m. The model box 1 is made of toughened glass. The height of the mold box 1 is 800 mm.

The reinforced earth 2 is filled with one or more layers of reinforced materials 6, and the reinforced earth 2 is positioned in the model box 1. An annular track 10 is formed on the surface of the reinforced earth 2.

The trolley system 3 runs on the annular runway 10, and different weights 7 can be weighed on the trolley system 3.

The measuring system 4 comprises strain gauges, an earth pressure cell 9 and a computer 11. The soil pressure cells 9 are vertically distributed on the upper side and the lower side of the reinforced material 6 in pairs, and strain gauges are horizontally arranged on each layer of reinforced material 6. The strain gauges and the earth pressure cell 9 transmit the data to the computer 11 for processing by means of sensors attached thereto.

The high-speed camera 5 faces the horizontal side of the model box 1.

Different reinforced materials can be added into two horizontal edges of the model box 1 or different road surfaces can be simulated for testing.

The trolley system 3 is provided with a vehicle-mounted sensor, and the autonomous movement of the vehicle-mounted sensor on the annular runway 10 can be controlled by a computer 11. The trolley system 3 is provided with a speed sensor, and the speed of the trolley system can be controlled on the annular runway 10 through a computer 11. The trolley system 3 is provided with a circulating device, and the circulating times of the trolley system can be controlled on the computer 11.

The positioning rod 8 is installed at the lower right corner of the model box 1, when the laser emission unit on the trolley system 3 scans the positioning rod 8, the cycle number in the memory is +1, and when the cycle number specified by the computer is reached, the brake sensor is triggered to stop the trolley.

The filling mode of the reinforced soil 2 in the model box 1 is as follows: the reinforced earth 2 is divided into a plurality of parts, and the parts are loaded into the model box 1 in layers with the thickness of 5cm of each layer. The specific method comprises the following steps: firstly, the reinforced soil 2 is dried, then the weight of the reinforced soil required by each layer is calculated according to the compactness of 70%, the reinforced soil is placed into a model box 1 in a layering mode and compacted, and the realization of the relative compactness is ensured by compacting the reinforced soil 2 with constant quality.

Different reinforced materials can be added into the two horizontal runways, the performance of different reinforced materials can be compared in parallel experiments, the same reinforced materials can be used for experiments with different intervals, different filling soil can be added for comparison, and different road surfaces can be simulated for experiment comparison.

The final applied load capacity is determined, and the weight blocks are placed on the trolley, so that the cyclic reciprocating action of vehicles with different weights on the road surface can be simulated. Before loading, the high-speed camera 5 can be started to continuously shoot, and displacement is monitored through the image processing system. During loading, after the displacement is observed to be not changed any more for 5min under the current load increment, the next load test is carried out after shooting.

When the experiment is started, the route of the trolley is planned in advance in the computer 11 through the vehicle-mounted sensor, and the trolley circularly reciprocates on the annular runway 10, so that the movement of the trolley system 3 can be controlled through the sensor only by inputting the controlled speed and the number of circulating circles on the computer 11, the automobile loads with different speeds can be simulated, and a plurality of trolleys can be simultaneously carried out, and the traffic loads with different flow rates can be simulated.

While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

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