CN217688942U - Stratum cavity collapse process simulation device based on stress detection - Google Patents
Stratum cavity collapse process simulation device based on stress detection Download PDFInfo
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- CN217688942U CN217688942U CN202221740581.9U CN202221740581U CN217688942U CN 217688942 U CN217688942 U CN 217688942U CN 202221740581 U CN202221740581 U CN 202221740581U CN 217688942 U CN217688942 U CN 217688942U
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Abstract
The utility model discloses a stratum cavity collapse process simulation device based on stress detection, which comprises an inflatable air bag, a pressure sensor, an air duct and an air pressure control module; the inflatable air bag is embedded at any depth and position in the soil layer to simulate an underground cavity; a plurality of pressure sensors are uniformly arranged on the surface of the inflatable air bag, stress change in the soil body is sensed at different positions of the air bag, the pressure acting on the surface of the air bag is obtained, and the pressure is transmitted to the air pressure control module; the air duct is connected with the inflatable air bag and the air pressure control module and is used for transmitting air; the pressure control module monitors the stress change of the surface of the air bag in real time, when the pressure value reaches a preset value, gas is slowly released, and the volume occupied by the air bag simulates an underground cavity. The utility model has the advantages that the simulation is because of the underground cavity that stratum stress state change leads to.
Description
Technical Field
The utility model relates to an underground works cavity induces the device field of subsiding, in particular to stratum cavity process analogue means that sinks based on stress detection.
Background
The ground collapse is a bad geological phenomenon that underground rock-soil bodies slide and collapse under the influence of natural factors or human activity factors and then develop to the ground surface to form pits on the ground, and is a geological disaster with burst property and high harmfulness. Along with the development of cities and the increase of human activities, the ground subsidence disasters in the cities, particularly the pavement subsidence disasters occur occasionally, although the ground subsidence scale in mining areas is not large, the ground subsidence disasters in case occur in the cities with large population density and large building size, and the ground subsidence disasters easily cause casualties and property loss.
Underground cavities in natural strata usually undergo long geological motion and have self-stability, and when model tests are carried out, the cavities in soil layers are difficult to artificially construct, so that the disturbance of underground engineering construction to the underground cavities and the occurrence of induced ground subsidence are difficult to study.
Most of the existing test devices for simulating the underground cavities manually control the air bags to release air so as to simulate the damage of the underground cavities, but in actual engineering, the instability of the underground cavities has certain burstiness and uncertainty, and the existing invention and research results cannot solve the problem, which is a place for the application to be improved seriously.
Chinese patent CN 204514914U and Chinese patent CN 105223336B disclose a test device and a method for simulating stratum loss caused by a subway shield tunnel stratum cavity, and the test device uses a polyvinyl chloride liquid bag to simulate the stratum cavity. In an actual stratum, a stratum cavity is in a relatively stable state, collapse cannot be caused, and the stratum cavity collapse can be caused only when the stress state of the stratum changes due to disturbance of the stratum caused by building construction disturbance or earthquake disaster and the like. In the above test devices, the collapse of the cavity is artificially controlled, and the collapse of the cavity caused by the change of the formation stress state cannot be realized, which has certain defects. This is where the application needs to focus on improvement.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a process analogue means is subsided to formation cavity based on stress detection is to be provided, the cavity that realizes leading to because of the formation stress state changes sinks.
In order to solve the technical problem, the utility model provides a stratum cavity collapse process simulation device based on stress detection, which comprises an inflatable air bag, a pressure sensor, an air duct and an air pressure control module; wherein:
the inflatable air bag is embedded at any depth and position in the soil layer to simulate an underground cavity;
the pressure sensors are uniformly distributed on the surface of the inflatable air bag, stress change in the soil body is sensed at different positions of the air bag, the pressure acting on the surface of the air bag is obtained, and the pressure is transmitted to the air pressure control module;
the air guide pipe is connected with the inflatable air bag and the air pressure control module and is used for transmitting air;
the air pressure control module is connected with the inflatable air bag through the air guide tube, the air pressure control module monitors the stress change on the surface of the air bag in real time, when the pressure value reaches a preset value, air is slowly released, and the volume occupied by the air bag simulates an underground cavity.
The air pressure control module comprises a controller and an air flow meter; the controller is used for controlling the air bag to inflate or deflate, and the air flow meters are arranged on the air inlet and the air outlet of the air bag and used for recording the volume of the gas in the inflating and exhausting processes.
In the initial stage of the test, the controller inflates the inflatable air bag, and the air volume during inflation is recorded by the air flow meter; after the test is started, the air pressure control module receives the pressure change of the surface of the air bag transmitted by the pressure sensor in real time, when the pressure is reduced to 40% -60% of the initial pressure value, the air pressure control module enables the air bag to release air through the controller, a cavity is formed in a soil layer, and cavity collapse caused by the change of the stratum stress state is achieved.
The method comprises the steps of inducing ground subsidence under the interference of underground engineering construction such as foundation pit excavation simulation and tunnel excavation simulation, recording the stress state of a soil body acting on the surface of an inflatable air bag through a pressure sensor arranged on the surface of the inflatable air bag, transmitting the stress state data to an air pressure control module through the pressure sensor, controlling and releasing gas in the air bag, forming a cavity in the test soil body, and simulating subsidence of the underground cavity.
The utility model has the advantages that:
1) The utility model can place the inflatable air bag at any position of the soil layer to simulate the underground cavity caused by the change of the stratum stress state;
2) The simulation device of the utility model monitors the internal pressure of the soil body in real time, when the pressure sensor monitors that the internal pressure of the soil body is reduced to 40% -60% of the initial pressure value, the air pressure control module starts to release the gas in the air bag, the air bag releases the gas to simulate the unstable collapse of the underground cavity, and the process does not need manual operation;
3) The utility model is suitable for the construction of various underground engineering or the working condition of underground process disasters;
4) The utility model discloses analogue means easy operation, safe and reliable.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of an embodiment of the present invention;
FIG. 2 is a diagram of a stress detection arrangement according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an experimental simulation according to an embodiment of the present invention;
the reference numbers in the figures illustrate:
1-an inflatable air bag; 2-a pressure sensor;
3, a gas guide tube; 4-air pressure control module;
5, a controller; 6-air flow meter;
7-a model box; 8-test soil sample;
9-shield model; 10-motor.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 shows a schematic structural diagram of a specific embodiment of the present invention; fig. 2 shows a stress detection layout according to an embodiment of the present invention. As shown in FIG. 1, the utility model provides a stratum cavity process analogue means that sinks based on stress detection, including aerifing gasbag 1, pressure sensor 2, air duct 3 and air pressure control module 4, air pressure control module 4 includes controller 5 and air flowmeter 6. As shown in fig. 2, a plurality of pressure sensors 2 are uniformly arranged on the surface of the inflatable airbag 1, and the pressure sensors 2 are fixed to the surface of the inflatable airbag 1 by means of adhesion. The pressure sensors 2 are used for detecting the stress states of the stratum in different directions, acquiring the pressure acting on the surface of the air bag and transmitting the pressure to the air pressure control module 4. Air flow meters 6 are arranged at the air inlet and the air outlet of the air bag and are used for recording the volume of gas in the processes of inflation and exhaust. The inflatable air bag 1 is embedded at any depth and position in a soil layer to simulate an underground cavity.
The air duct 3 is connected with the inflatable air bag 1 and the air pressure control module 4 and is used for transmitting air;
the air pressure control module 4 is connected with the inflatable air bag 1 through the air duct 3 to control the inflation and deflation of the air bag.
At the beginning stage of the test, the controller 5 inflates the inflatable airbag 1; after the test is started, the air pressure control module 4 receives the pressure change of the surface of the air bag transmitted by the pressure sensor 2 in real time, when the pressure is reduced to 40% -60% of the initial pressure value, the air pressure control module 4 enables the air bag to release air through the controller 5, and a cavity is formed in a soil layer, so that the cavity collapse caused by the change of the stratum stress state is realized.
The present invention will be described in detail with reference to fig. 3. Taking tunnel engineering as an example, but not limited to tunnel engineering. Fig. 3 is a schematic diagram of an implementation of a stratum cavity collapse process simulation apparatus based on stress detection under a tunnel engineering construction condition.
As shown in fig. 3, the mold box 7 is formed of a four-sided transparent glass plate for observation and recording. The prepared test soil sample 8 is uniformly placed in a model box, an uninflated air bag is placed at any position in the model box 7, a motor 10 is arranged on one side of the model box 7, the motor 10 is connected with a shield model 9, the shield model 9 is driven to move, and the process that various underground engineering constructions are simulated, and the construction disturbance causes the damage of a cavity in a stratum is simulated. Before the test is started, the gas is infused into the air bag through the controller 5, the air bag is inflated to simulate the underground cavity in the stratum, the air pressure in the air bag is observed through the air flow meter 6, and the test is started after the air pressure is stabilized. When the test is started, the shield model 9 simulates tunnel construction through the motor 10, the soil body in front of the tunnel generates displacement change to cause the change of the stratum stress, the pressure sensor 2 arranged on the inflatable air bag 1 transmits the pressure change on the air bag to the air pressure control module 4 in real time, and when the pressure is reduced to 50% of the initial pressure value, the air pressure control module 4 releases air in the air bag through the controller 5 to simulate cavity instability. The gas in the air bag is discharged through the gas guide tube 3, the discharge speed is 30L/min, the air flow meter 6 monitors the gas discharge condition of the air bag, and the air is completely discharged to determine the instability of the cavity.
Through the soil pressure gauge and the displacement sensor which are arranged in the model box 7, the changes of parameters such as stress, displacement and the like in the test process are recorded in real time, and the instability failure mode and the development process of stratum cavity induced collapse caused by the changes of the stress state of the stratum under the construction working condition of tunnel engineering are obtained.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The utility model provides a stratum cavity process analogue means that collapses based on stress detection which characterized in that: comprises an inflatable air bag, a pressure sensor, an air duct and an air pressure control module; wherein:
the inflatable air bag is embedded at any depth and position in the soil layer to simulate an underground cavity;
the pressure sensors are uniformly distributed on the surface of the inflatable air bag, stress change in the soil body is sensed at different positions of the air bag, the pressure acting on the surface of the air bag is obtained, and the pressure is transmitted to the air pressure control module;
the air guide pipe is connected with the inflatable air bag and the air pressure control module and is used for transmitting air;
the air pressure control module is connected with the inflatable air bag through the air guide pipe, the air pressure control module monitors the stress change on the surface of the air bag in real time, when the pressure value reaches a preset value, air is slowly released, and the volume occupied by the air bag simulates the collapse of an underground cavity.
2. The device for simulating the stratum cavity collapse process based on stress detection as claimed in claim 1, wherein: the air pressure control module comprises a controller and an air flow meter, the controller is used for inflating or deflating the air bag, the air flow meter is arranged on the air inlet and the air outlet of the air bag, and the volume of gas in the inflating and exhausting process is recorded.
3. The device for simulating the formation cavity collapse process based on stress detection as claimed in claim 2, wherein: the air pressure control module monitors the pressure change of the surface of the air bag in real time, and when the pressure is reduced to 40% -60% of the initial pressure value, the air bag is controlled to release air, and a cavity is formed in a soil layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202221740581.9U CN217688942U (en) | 2022-07-07 | 2022-07-07 | Stratum cavity collapse process simulation device based on stress detection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221740581.9U CN217688942U (en) | 2022-07-07 | 2022-07-07 | Stratum cavity collapse process simulation device based on stress detection |
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| CN217688942U true CN217688942U (en) | 2022-10-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117074154A (en) * | 2023-01-29 | 2023-11-17 | 北京建筑大学 | Pipe-curtain-method jacking pipe jacking force test system and test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117074154A (en) * | 2023-01-29 | 2023-11-17 | 北京建筑大学 | Pipe-curtain-method jacking pipe jacking force test system and test method |
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