Device and method for simulating karst collapse under rainfall and variable karst channel conditions

Abstract

The invention discloses a device for simulating karst collapse under rainfall and variable karst channel conditions, which comprises a covering soil layer simulation box, a water head control mechanism is arranged on the outer side of the covering soil layer simulation box, a rainfall mechanism is arranged above the covering soil layer simulation box, and a test soil body is contained in the covering soil layer simulation box. A karst hole simulation opening is formed in the bottom of the covering soil layer simulation box, and a karst cave simulation box is arranged below the covering soil layer simulation box; a simulation pipeline is connected between the karst hole simulation opening and the karst cave simulation box, and the simulation pipeline corresponds to the shape of a simulation karst channel. The simulation pipeline is a hose; a pipeline shaping assembly is further arranged between the karst hole simulation opening and the karst cave simulation box, and the pipeline shaping assembly can shape the simulation pipeline into the needed shape. According to the invention, the variable karst channel can be simulated.

Description

Technical Field

[0001] The invention relates to the technical field of karst collapse simulation, and in particular to a device and method for simulating karst collapse under conditions of rainfall and variable karst channels. Background Art

[0002] The karst system is relatively developed in the deep karst area. The karst system includes caves, karst crevices and karst channels, which can provide space for water and soil movement. Under the action of rainfall, the effects of groundwater, karst water and surface water intensify, the degree of soil and water loss in the deep karst area deepens, and the physical properties of the covering layer of soil change, thus causing disasters such as karst collapse. Therefore, it is necessary to develop a simulation test device for deep karst collapse under rainfall conditions to study the laws of deep karst water and soil movement. The existing karst collapse test device can only simulate karst channels of fixed shape, but the shape of some karst channels may change during the process of karst collapse. For the simulation of karst collapse under the conditions of variable karst channels, there is currently a lack of corresponding simulation test devices. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a device and method for simulating karst collapse under conditions of rainfall and variable karst channels, which can simulate variable karst channels.

[0004] Technical solution: To achieve the above-mentioned purpose, the present invention provides a device for simulating karst collapse under conditions of rainfall and variable karst channels, comprising a covering soil layer simulation box, a water head control mechanism is arranged on the outside of the covering soil layer simulation box, a rainfall mechanism is arranged on the top of the covering soil layer simulation box, a test soil is placed in the covering soil layer simulation box, a karst hole simulation port is opened at the bottom of the covering soil layer simulation box, and a karst cave simulation box is arranged below the covering soil layer simulation box; a simulation pipeline is connected between the karst hole simulation port and the karst cave simulation box, and the simulation pipeline corresponds to the shape of the simulated karst channel; the simulation pipeline is a hose; a pipeline molding component is also arranged between the karst hole simulation port and the karst cave simulation box, and the pipeline molding component can mold the simulation pipeline into a desired shape.

[0005] Furthermore, the simulation pipeline is detachably assembled between the karst hole simulation port and the karst cave simulation box, so that the simulation pipeline is replaceable.

[0006] Furthermore, assembly heads are installed at both ends of the simulation pipeline; a pipeline interface is provided at the top of the karst cave simulation box, and the pipeline interface is detachably connected to the assembly head at the lower end of the simulation pipeline; a plurality of karst hole simulation ports are provided at the bottom of the covering soil layer simulation box, and each karst hole simulation port can be opened and closed individually, and the assembly head at the upper end of the simulation pipeline can be selectively connected to one of the karst hole simulation ports.

[0007] Furthermore, the opening size of the simulated karst hole is adjustable.

[0008] Furthermore, the shape of the pipe shaping component can be actively changed, so that the shape of the simulated pipe can change during the process of simulating karst collapse.

[0009] Furthermore, the pipe shaping component includes an inner pipe shaping unit and an outer pipe shaping unit; the inner pipe shaping unit includes an inner support mold, which is made of a hard material and is placed in the simulated pipe. The inner support mold can support the simulated pipe into a desired shape, and a soluble material layer is coated on the inner support mold. When the soluble material layer dissolves, the internal shape of the simulated pipe is changed; the outer pipe shaping unit includes an external movable bracket, and a plurality of force end points are arranged on the outer pipe wall of the simulated pipe, and the external movable bracket is connected to the plurality of force end points; the external movable bracket can actively deform to change the shape of the simulated pipe.

[0010] Furthermore, the inner support mold is supported and arranged on the upper surface of the inner wall of the simulated pipe to shape the shape of the upper contour surface of the simulated pipe, and a soluble material layer is coated on the side of the inner support mold facing the lower surface of the inner wall of the simulated pipe; the outer movable bracket is connected to the force-bearing end point of the lower surface of the outer wall of the simulated pipe to shape the shape of the lower contour surface of the simulated pipe.

[0011] Furthermore, the water head control mechanism includes a water tank. There are two water tanks, which are located on both sides of the covering soil layer simulation box respectively. The two water tanks are respectively connected to the water holes on both sides of the covering soil layer simulation box or the karst cave simulation box through water pipes; the two water tanks are respectively installed on vertical guide rails so that the heights of the two water tanks can be adjusted.

[0012] Furthermore, the rainfall mechanism comprises a plurality of rows of rainfall pipes arranged just above the covering soil layer simulation box, the rainfall pipes are provided with water outlet holes, and the water supply tank supplies water to the plurality of rows of rainfall pipes through a water pump.

[0013] Furthermore, a method for simulating karst collapse under conditions of rainfall and variable karst channels comprises the following steps: step S1: obtaining the shape structure of the karst channel to be simulated, and predicting the shape change trend of the karst channel during the karst collapse process according to the software; step S2: making an inner support mold according to the shape structure of the karst channel to be simulated, and coating the inner support mold with a soluble material layer, and then inserting the inner support mold into the simulation pipe, and making the soluble material layer face the lower surface of the inner wall of the simulation pipe, so that the shape of the upper contour surface of the simulation pipe is shaped by the inner support mold; step S3: assembling the simulation pipe between the karst hole simulation port and the karst cave simulation box, and then connecting the outer movable bracket to the outer support mold; step S4: assembling the simulation pipe between the karst hole simulation port and the karst cave simulation box, and then connecting the outer movable bracket to the outer support mold; step S5: assembling the simulation pipe between the karst hole simulation port and the karst cave simulation box, and then connecting the outer movable bracket to the outer support mold; step S6: assembling the simulation pipe between the karst hole simulation port and the karst cave simulation box, and then connecting the outer movable bracket to the outer support mold; step S7: assembling the simulation pipe between the karst hole simulation port and the karst cave simulation box, and then connecting the outer support mold to the outer support mold; step S8: assembling the simulation pipe between the karst hole simulation port and the karst cave simulation box, and then connecting the outer support mold to the outer support mold; step S9: assembling the simulation pipe between the karst hole simulation port and the karst cave simulation box, and then connecting the outer support mold to the outer support mold; step S10: assembling the simulation pipe between the karst hole simulation port and the karst cave simulation box, and then connecting the outer support mold to the outer support mold; step S11: assembling the simulation pipe between the karst hole At the stress end point of the lower surface of the outer wall of the simulated pipeline, the computer then controls the active deformation of the external movable bracket, so that the external movable bracket shapes the shape of the lower contour surface of the simulated pipeline; step S4: the test soil is loaded into the covering soil layer simulation box; step S5: the head control mechanism transports water to the covering soil layer simulation box and the karst cave simulation box to simulate groundwater; step S6: the rainfall mechanism is started and simulates rainfall, and the rainfall causes the water and soil in the covering soil layer simulation box to flow to the karst cave simulation box through the simulated pipeline; during the rainfall process, the soluble material layer is dissolved, and the computer controls the deformation of the external movable bracket according to the software prediction, and jointly simulates the shape change of the karst channel during the karst collapse process.

[0014] Beneficial effects: The device and method of the present invention for simulating karst collapse under conditions of rainfall and variable karst channels have the following beneficial effects:

[0015] 1) Using a simulated pipe to simulate the shape of the karst channel, the simulated pipe is a hose, and the simulated pipe can be shaped into a desired shape through a pipe shaping component, so that the simulated pipe can simulate a karst channel with a variable shape;

[0016] 2) The upper contour surface of the simulated pipeline is shaped by an internal support mold, which is coated with a soluble material layer. During the process of soil erosion, the soluble material layer will gradually dissolve, thereby simulating the changes in the karst channel under natural conditions; the lower contour surface of the simulated pipeline is shaped by an external movable bracket, and the shape of the external movable bracket is controlled by the simulation results of the computer, thereby changing the shape of the lower contour surface of the simulated pipeline; therefore, in the present invention, the simulation results of the computer and the simulation results of the soluble material layer are combined. Compared with using a single simulation result, the combination of the two simulation results can reduce errors and improve the simulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is a schematic diagram of the three-dimensional structure of the simulation device;

[0018] Attached Figure 2 is a front view of the simulation device;

[0019] Attached Figure 3is a cross-sectional view of the simulation device;

[0020] Attached Figure 4 Schematic diagram of the inner support mold and the load-bearing end points. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] As attached Figures 1 to 4 The device for simulating karst collapse under rainfall and variable karst channel conditions comprises a covering soil simulation box 1, a water head control mechanism 2 is arranged on the outside of the covering soil simulation box 1, a rainfall mechanism 3 is arranged above the covering soil simulation box 1, a test soil body is contained in the covering soil simulation box 1, a karst hole simulation port 4 is opened at the bottom of the covering soil simulation box 1, and a karst cave simulation box 5 is arranged below the covering soil simulation box 1. A water outlet is arranged at the bottom of the karst cave simulation box 5 to discharge the substances in the karst cave simulation box 5. The karst cave simulation box 5 can be installed on the device in a push-pull manner to control the air tightness of the simulation device.

[0023] A simulation pipe 6 is connected between the karst hole simulation port 4 and the karst cave simulation box 5, and the simulation pipe 6 corresponds to the shape of the simulated karst channel. The simulation pipe 6 is a hose; a pipe shaping component is also provided between the karst hole simulation port 4 and the karst cave simulation box 5, and the pipe shaping component can shape the simulation pipe 6 into a desired shape. The shape of the simulation pipe 6 is shaped and changed by the pipe shaping component, so that the simulation pipe 6 can simulate a deformable karst channel.

[0024] The simulation pipe 6 is detachably assembled between the karst hole simulation port 4 and the karst cave simulation box 5, so that the simulation pipe 6 is replaceable. The simulation pipe 6 can be replaced with a pipe body of different shapes, different materials and different sizes to simulate different karst channels.

[0025] Assembly heads 7 are respectively installed at both ends of the simulation pipeline 6. A pipeline interface 8 is provided at the top of the karst cave simulation box 5, and the pipeline interface 8 is detachably connected to the assembly head 7 at the lower end of the simulation pipeline 6. A plurality of karst hole simulation ports 4 are provided at the bottom of the covering soil layer simulation box 1, and each karst hole simulation port 4 can be opened and closed separately, and the assembly head 7 at the upper end of the simulation pipeline 6 can be selectively connected to one of the karst hole simulation ports 4. Although the simulation pipeline 6 is a hose and its shape is changeable, after the simulation pipeline 6 is assembled, the relative positions of the upper and lower ends of the simulation pipeline 6 are fixed and cannot be changed, so it is necessary to set a plurality of karst hole simulation ports 4 at the bottom of the covering soil layer simulation box 1. By selecting different karst hole simulation ports 4, the relative positions of the upper and lower ends of the simulation pipeline 6 can be changed.

[0026] The opening size of the karst hole simulation opening 4 can be adjusted to simulate karst channels with different opening sizes.

[0027] The shape of the pipeline shaping component can be actively changed, so that the shape of the simulated pipeline 6 can change during the process of simulating karst collapse. Through the active change of the pipeline shaping component, the simulated pipeline 6 can simulate the deformable karst channel.

[0028] Specifically, the pipeline shaping component includes an inner-pipe shaping unit and an outer-pipe shaping unit. The inner-pipe shaping unit shapes the simulated pipeline 6 from the inside of the pipeline, and the outer-pipe shaping unit shapes the simulated pipeline 6 from the outside of the pipeline.

[0029] As attached Figure 4 As shown in , the in-tube shaping unit includes an inner support mold 9, which is made of a hard material. Since the simulated pipe 6 is a soft pipe, the inner support mold 9 can be inserted into the simulated pipe 6, and the inner support mold 9 can support the simulated pipe 6 into the desired shape. In addition, a soluble material layer 11 is also coated on the inner support mold 9, and the soluble material layer 11 can be dissolved in water. When the lost water and soil pass through the simulated pipe 6, the soluble material layer 11 will dissolve and change the internal shape of the simulated pipe 6.

[0030] The outer tube shaping unit includes an outer movable bracket, and a plurality of force-bearing end points 10 are arranged on the outer tube wall of the simulated tube 6. The outer movable bracket is connected to the plurality of force-bearing end points 10, and the shape of the simulated tube 6 is shaped by the outer movable bracket. The outer movable bracket can be actively deformed to change the shape of the simulated tube 6.

[0031] The inner support mold 9 is supported and arranged on the upper surface of the inner wall of the simulated pipe 6 to shape the shape of the upper contour surface of the simulated pipe 6, and a soluble material layer 11 is piled on the side of the inner support mold 9 facing the lower surface of the inner wall of the simulated pipe 6. If the inner support mold 9 is arranged on the lower surface of the inner wall of the simulated pipe 6, then when the lost water and soil pass through the simulated pipe 6, the dissolution rate of the soluble material layer 11 will be too fast, which is not conducive to the simulation of the variable lava channel. Therefore, the inner support mold 9 is arranged on the upper surface of the inner wall of the simulated pipe 6, and correspondingly, the outer movable bracket is connected to the force end point 10 of the lower surface of the outer wall of the simulated pipe 6 to shape the shape of the lower contour surface of the simulated pipe 6.

[0032] The water head control mechanism 2 includes a water tank 12, and there are two water tanks 12, which are respectively located on both sides of the covering soil layer simulation box 1. Water delivery holes are set on both sides of the covering soil layer simulation box 1 and the karst cave simulation box 5. The two water tanks 12 can be connected to the water delivery holes on both sides of the covering soil layer simulation box 1 through a water delivery pipe 13, so that there is a certain amount of groundwater in the test soil body to simulate the groundwater level of the covering soil layer. The two water tanks 12 can also be connected to the water delivery holes on both sides of the karst cave simulation box 5 through a water delivery pipe 13, so that there is a certain amount of groundwater in the karst cave to be simulated, simulating the groundwater level of the karst cave. The water delivery holes are blocked when not in use. The two water tanks 12 are respectively installed on the vertical guide rails 14, so that the heights of the two water tanks 12 can be adjusted. By adjusting the height of the water tanks 12, the water head in the covering soil layer simulation box 1 or the karst cave simulation box 5 can be controlled.

[0033] As attached Figure 1 and 2 As shown in the figure, a bracket is installed on the covering soil layer simulation box 1, and two pressure measuring tubes 18 are arranged on the bracket, one of which is connected to the pressure measuring port on the covering soil layer simulation box 1, and the other pressure measuring tube 18 is connected to the pressure measuring port on the assembly head 7 to detect the air pressure in the covering soil layer simulation box 1 and the simulation pipeline 6.

[0034] The rainfall mechanism 3 includes multiple rows of rainfall pipes 15 arranged just above the covering soil layer simulation box 1, and water outlet holes are opened on the rainfall pipes 15. The water supply tank 16 supplies water to the multiple rows of rainfall pipes 15 through a water pump 17. The rainfall pipes 15 are installed with infrared displacement sensors 19, and the infrared displacement sensors 19 detect the displacement of the surface layer of the soil body contained in the covering soil layer simulation box 1.

[0035] The present invention also provides a method for simulating karst collapse under conditions of rainfall and variable karst channels, comprising the following steps:

[0036] Step S1: obtaining the shape structure of the karst channel to be simulated by means of a detector or the like, inputting the obtained shape of the karst channel into a computer, and using the computer to predict the shape change trend of the karst channel during the karst collapse process according to software;

[0037] Step S2: according to the shape and structure of the karst channel to be simulated, an inner support mold 9 is made, and a soluble material layer 11 is coated on the inner support mold 9, and then the inner support mold 9 is inserted into the simulated pipe 6, and the soluble material layer 11 is directed toward the lower surface of the inner wall of the simulated pipe 6, so that the inner support mold 9 shapes the shape of the upper contour surface of the simulated pipe 6;

[0038] Step S3: Select a suitable karst hole simulation port 4, assemble the simulation pipe 6 between the karst hole simulation port 4 and the karst cave simulation box 5, close the karst hole simulation port 4 not connected to the simulation pipe 6, and adjust the karst hole simulation port 4 connected to the simulation pipe 6 to a suitable size; then, connect the external movable bracket to the force-bearing end point 10 on the lower surface of the outer wall of the simulation pipe 6, and then control the external movable bracket to actively deform by a computer, so that the external movable bracket shapes the shape of the lower contour surface of the simulation pipe 6;

[0039] Step S4: placing the test soil into the covering soil layer simulation box 1;

[0040] Step S5: the water head control mechanism 2 delivers water to the covering soil simulation box 1 and the karst cave simulation box 5 to simulate groundwater;

[0041] Step S6: The rainfall mechanism 3 is started and simulates rainfall. The rainfall causes the water and soil in the covering soil layer simulation box 1 to flow into the karst cave simulation box 5 through the simulation pipe 6. During the rainfall process, the soluble material layer 11 is dissolved, and the computer controls the deformation of the external movable support according to the software prediction, thereby jointly simulating the shape change of the karst channel during the karst collapse process.

[0042] In the present invention, the upper contour surface of the simulated pipe 6 is shaped by the inner support mold 9, and the inner support mold 9 is coated with a soluble material layer 11. During the process of soil erosion, the soluble material layer 11 will gradually dissolve, thereby simulating the changes in the karst channel under natural conditions; the lower contour surface of the simulated pipe 6 is shaped by the external movable bracket, and the shape of the external movable bracket is controlled by the simulation results of the computer, thereby changing the shape of the lower contour surface of the simulated pipe 6; therefore, in the present invention, the simulation results of the computer and the simulation results of the soluble material layer 11 are combined.

[0043] Since the actual shape change of the karst channel during the karst collapse process is extremely complex, if a single simulation method is used, the error of the simulation result is large. In the present invention, two simulation methods are used simultaneously to simulate the shape change of the karst channel, which can reduce the error and be closer to the actual change trend of the karst channel, thereby improving the reliability of the karst collapse simulation test under the condition of variable karst channel.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for simulating karst collapse under conditions of rainfall and variable karst channels, characterized in that: The invention comprises a covering soil layer simulation box (1), wherein a water head control mechanism (2) is arranged on the outside of the covering soil layer simulation box (1), a rainfall mechanism (3) is arranged on the top of the covering soil layer simulation box (1), a test soil body is placed in the covering soil layer simulation box (1), a karst hole simulation opening (4) is opened at the bottom of the covering soil layer simulation box (1), and a karst cave simulation box (5) is arranged below the covering soil layer simulation box (1); a simulation pipeline (6) is connected between the karst hole simulation opening (4) and the karst cave simulation box (5), and the simulation pipeline (6) corresponds to the shape of the simulated karst channel; The simulation pipeline (6) is a hose; a pipeline shaping component is also provided between the karst hole simulation port (4) and the karst cave simulation box (5), and the pipeline shaping component can shape the simulation pipeline (6) into a desired shape.

2. The device for simulating karst collapse under conditions of rainfall and variable karst channels according to claim 1, characterized in that: The simulation pipeline (6) is detachably mounted between the karst hole simulation port (4) and the karst cave simulation box (5), so that the simulation pipeline (6) is replaceable.

3. The device for simulating karst collapse under conditions of rainfall and variable karst channels according to claim 2, characterized in that: Both ends of the simulation pipeline (6) are provided with assembly heads (7); the top of the karst cave simulation box (5) is provided with a pipeline interface (8), and the pipeline interface (8) is detachably connected to the assembly head (7) at the lower end of the simulation pipeline (6); the bottom of the covering soil layer simulation box (1) is provided with a plurality of karst hole simulation ports (4), each of which can be opened and closed separately, and the assembly head (7) at the upper end of the simulation pipeline (6) can be selectively connected to one of the karst hole simulation ports (4).

4. The device for simulating karst collapse under conditions of rainfall and variable karst channels according to claim 2, characterized in that: The opening size of the karst hole simulation opening (4) is adjustable.

5. The device for simulating karst collapse under conditions of rainfall and variable karst channels according to claim 4, characterized in that: The shape of the pipeline shaping component can be actively changed, so that the shape of the simulated pipeline (6) can change during the process of simulating karst collapse.

6. The device for simulating karst collapse under conditions of rainfall and variable karst channels according to claim 5, characterized in that: The pipeline shaping component comprises an inner-tube shaping unit and an outer-tube shaping unit; the inner-tube shaping unit comprises an inner support mold (9), the inner support mold (9) is made of a hard material and is placed in the simulated pipeline (6); the inner support mold (9) can support the simulated pipeline (6) into a desired shape; a soluble material layer (11) is deposited on the inner support mold (9); when the soluble material layer (11) dissolves, the internal shape of the simulated pipeline (6) is changed; The outer tube shaping unit comprises an external movable support, a plurality of force-bearing end points (10) are arranged on the outer tube wall of the simulated tube (6), and the external movable support is connected to the plurality of force-bearing end points (10); the external movable support can actively deform to change the shape of the simulated tube (6).

7. The device for simulating karst collapse under conditions of rainfall and variable karst channels according to claim 6, characterized in that: The inner support mold (9) is supported and arranged on the upper surface of the inner wall of the simulated pipe (6) to shape the shape of the upper contour surface of the simulated pipe (6); a soluble material layer (11) is piled on the side of the inner support mold (9) facing the lower surface of the inner wall of the simulated pipe (6); the outer movable bracket is connected to the force-bearing end point (10) of the lower surface of the outer wall of the simulated pipe (6) to shape the shape of the lower contour surface of the simulated pipe (6).

8. The device for simulating karst collapse under conditions of rainfall and variable karst channels according to claim 7, characterized in that: The water head control mechanism (2) comprises a water tank (12). There are two water tanks (12), which are respectively located on both sides of the covering soil layer simulation box (1). The two water tanks (12) are respectively connected to the water delivery holes on both sides of the covering soil layer simulation box (1) or the karst cave simulation box (5) through water delivery pipes (13). The two water tanks (12) are respectively installed on vertical guide rails (14) so ​​that the heights of the two water tanks (12) can be adjusted.

9. The device for simulating karst collapse under conditions of rainfall and variable karst channels according to claim 7, characterized in that: The rainfall mechanism (3) comprises a plurality of rows of rainfall pipes (15) arranged directly above the covering soil layer simulation box (1), the rainfall pipes (15) being provided with water outlet holes, and the water supply box (16) supplies water to the plurality of rows of rainfall pipes (15) via a water pump (17).

10. The method for simulating karst collapse under conditions of rainfall and variable karst channels according to claim 7, characterized in that: The following steps are involved: Step S1: obtaining the shape structure of the karst channel to be simulated, and predicting the shape change trend of the karst channel during the karst collapse process according to the software; Step S2: according to the shape and structure of the karst channel to be simulated, an inner support mold (9) is manufactured, and a soluble material layer (11) is coated on the inner support mold (9), and then the inner support mold (9) is inserted into the simulated pipe (6), and the soluble material layer (11) is directed toward the lower surface of the inner wall of the simulated pipe (6), so that the shape of the upper contour surface of the simulated pipe (6) is shaped by the inner support mold (9); Step S3: assembling the simulated pipe (6) between the karst hole simulation port (4) and the karst cave simulation box (5), then connecting the external movable bracket to the force-bearing end point (10) on the lower surface of the outer wall of the simulated pipe (6), and then controlling the external movable bracket to actively deform by a computer, so that the external movable bracket shapes the shape of the lower contour surface of the simulated pipe (6); Step S4: placing the test soil into the covering soil layer simulation box (1); Step S5: the water head control mechanism (2) delivers water to the covering soil layer simulation box (1) and the karst cave simulation box (5) to simulate groundwater; Step S6: The rainfall mechanism (3) is started and simulates rainfall, and the rainfall causes the water and soil in the covering soil layer simulation box (1) to flow into the karst cave simulation box (5) through the simulation pipeline (6); during the rainfall process, the soluble material layer (11) is dissolved, and the computer controls the deformation of the external movable support according to the software prediction, thereby jointly simulating the shape change of the karst channel during the karst collapse process.

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