Multi-stage flexible net structure for large-scale debris flow prevention and control

Abstract

The invention provides a multi-stage flexible net structure for large-scale debris flow prevention and control, which is applied to a large-scale dynamic simulation experiment platform for mountain disasters, and the experiment platform comprises an experiment water tank main body and an apron located at the bottom of the experiment water tank main body; comprising a plurality of flexible nets located in an experimental water tank body and at least two flexible nets located on an apron, and each flexible net on the apron is arranged in the direction perpendicular to an outlet of the experimental water tank body. Through the arrangement of the multiple flexible nets in the experimental water tank main body, when debris flow is filled with silt in the front flexible net and overflows to cause structural failure, the multiple flexible nets behind can play a prevention and treatment role, and the arrangement of the at least two flexible nets on the apron can research that the debris flow rushes out of the opening of the natural channel and diffuses. And the flexible net has a prevention and treatment effect on debris flow. The whole multi-stage flexible net works cooperatively, and multiple prevention and control of the flexible net on the debris flow starting process, the acceleration process, the deceleration process and the diffusion process can be researched.

Description

Technical Field

[0001] The present invention relates to the technical field of debris flow disaster prevention and control engineering, and particularly relates to a multi-stage flexible net structure for large-scale debris flow prevention and control. Background Art

[0002] Debris flow is a geological disaster that often occurs in mountainous areas. This kind of disaster is characterized by large scale, high speed and strong impact force. When humans carry out development and necessary economic activities in mountainous areas, they will be affected by this type of disaster. For example, infrastructure such as highways, railways and housing buildings will be destroyed. In order to combat such disasters, flexible nets are usually built in the predicted debris flow gullies. The flexible net prevents the movement of debris flow through its high permeability and the deformation of the debris flow-structure interaction, prolongs the duration of the impact and weakens the peak impact. However, the current design of flexible nets is mostly for small-scale and single debris flows, ignoring the effects of debris flow overtopping, seepage, scale effect caused by long-term impact of debris flow, and the diffusion of debris flow when it rushes out of the gully mouth. Summary of the Invention

[0003] Embodiments of the present invention provide a multi-stage flexible net structure for large-scale debris flow prevention and control, which can solve the problem that the current flexible nets are mainly designed for small-scale and single debris flows, ignoring the effects of debris flow overtopping, seepage, scale effect caused by long-term impact of debris flow, and the diffusion when it rushes out of the gully mouth.

[0004] Embodiments of the present invention provide a multi-stage flexible net structure for large-scale debris flow prevention and control, which is applied to a large-scale dynamic simulation experimental platform for mountain disasters. The experimental platform includes an experimental water tank main body and an apron located at the bottom of the experimental water tank main body;

[0005] The multi-stage flexible net structure includes: multiple flexible nets located in the experimental water tank main body and at least two flexible nets located on the apron. Each flexible net on the apron is arranged along the direction perpendicular to the outlet of the experimental water tank main body.

[0006] In some embodiments, along the upstream to downstream of the experimental water tank main body, the multiple flexible nets include a first flexible net, a second flexible net, a third flexible net and a fourth flexible net arranged in sequence. The distance between the first flexible net and the top of the experimental water tank main body is L1m, the distance between the first flexible net and the top of the experimental water tank main body is L2m, the distance between the first flexible net and the top of the experimental water tank main body is L3m, and the distance between the first flexible net and the top of the experimental water tank main body is L4m.

[0007] In some embodiments, L1 is 12m to 20m; and / or

[0008] L2 is 48 m to 60 m; and / or

[0009] L3 is 85 m to 105 m; and / or

[0010] L4 is 110 m to 130 m.

[0011] In some embodiments, the experimental water tank body is sequentially provided with a first water tank with an angle of 30° to 35° and a second water tank with an angle of 12° to 18° from upstream to downstream. The first flexible net and the second flexible net are in the first water tank, and the third flexible net and the fourth flexible net are in the second water tank.

[0012] In some embodiments, hanging points are symmetrically arranged on both sides of the tank wall of the experimental water tank body along the first flexible net; and / or

[0013] Hanging points are symmetrically arranged on both sides of the tank wall of the experimental water tank body along the second flexible net; and / or

[0014] Hanging points are symmetrically arranged on both sides of the tank wall of the experimental water tank body along the third flexible net; and / or

[0015] Hanging points are symmetrically arranged on both sides of the tank wall of the experimental water tank body along the fourth flexible net.

[0016] In some embodiments, the number of the hanging points on each side of the tank wall of the experimental water tank body where the first flexible net is located is 3 to 10; and / or

[0017] The number of the hanging points on each side of the tank wall of the experimental water tank body where the second flexible net is located is 3 to 10; and / or

[0018] The number of the hanging points on each side of the tank wall of the experimental water tank body where the third flexible net is located is 3 to 10; and / or

[0019] The number of the hanging points on each side of the tank wall of the experimental water tank body where the fourth flexible net is located is 3 to 10.

[0020] In some embodiments, the distance from the bottommost hanging point of the first flexible net to the bottom of the experimental water tank body is 0.3 m to 0.7 m; and / or

[0021] The distance from the bottommost hanging point of the second flexible net to the bottom of the experimental water tank body is 0.3 m to 0.7 m; and / or

[0022] The distance from the bottommost hanging point of the third flexible net to the bottom of the experimental water tank body is 0.3 m to 0.7 m; and / or

[0023] The distance from the hanging point at the bottom of the fourth flexible net to the bottom of the main body of the experimental water tank is 0.3 m to 0.7 m.

[0024] In some embodiments, the hanging points on each side of the tank wall of the main body of the experimental water tank where the first flexible net is located are arranged vertically or perpendicular to the bottom of the main body of the experimental water tank; and / or

[0025] The hanging points on each side of the tank wall of the main body of the experimental water tank where the second flexible net is located are arranged vertically or perpendicular to the bottom of the main body of the experimental water tank; and / or

[0026] The hanging points on each side of the tank wall of the main body of the experimental water tank where the third flexible net is located are arranged vertically or perpendicular to the bottom of the main body of the experimental water tank; and / or

[0027] The hanging points on each side of the tank wall of the main body of the experimental water tank where the fourth flexible net is located are arranged vertically or perpendicular to the bottom of the main body of the experimental water tank.

[0028] In some embodiments, along the direction towards the outlet of the main body of the experimental water tank, the widths of the flexible nets on the apron gradually increase.

[0029] In some embodiments, each flexible net on the apron is supported by the hole positions on the apron and the support columns in the hole positions.

[0030] Advantageous effects of the embodiments of the present invention:

[0031] In this application, through the arrangement of multiple flexible nets in the main body of the experimental water tank, when the debris flow fills up the previous flexible net and overflows, resulting in the failure of the structure, the subsequent multiple flexible nets can play a prevention and control role. The arrangement of at least two flexible nets on the apron can study the diffusion of the debris flow when it rushes out of the natural gully mouth, and the prevention and control effect of the flexible net on the debris flow. The configuration of multiple flexible nets can also effectively disperse the impact force of the debris flow, reduce the pressure on a single protective net, and extend the service life of the protection system. At the same time, the prevention and control effects of multiple flexible nets under different flow velocity conditions can provide a scientific basis for the hierarchical early warning and prevention and control strategies of debris flow disasters. The entire multi-level flexible nets work together, and the multiple prevention and control of the flexible net on the starting process, accelerating process, decelerating process and diffusion process of the debris flow can be studied. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0033] Figure 1 It is the overall structure diagram of the large-scale dynamic simulation experimental platform for mountain disasters of the present invention;

[0034] Figure 2 It is the structural schematic diagram of the vertical hanging point of the present invention;

[0035] Figure 3 It is the structural schematic diagram of the perpendicular hanging point of the present invention;

[0036] Figure 4 It is the structural schematic diagram of the apron of the present invention;

[0037] Figure 5 It is the three-dimensional view of the artificial rainfall mechanism of the present invention;

[0038] Figure 6 It is the sectional view of the artificial rainfall mechanism of the present invention. Specific embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present invention. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise stated, the orientation words such as "upper" and "lower" usually refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; and "inner" and "outer" refer to the outline of the device.

[0040] Please refer to Figure 1 , the embodiments of the present application provide a multi-stage flexible net structure for large-scale debris flow prevention and control, which is applied to a large-scale dynamic simulation experimental platform for mountain disasters. The experimental platform includes an experimental water tank main body and an apron located at the bottom of the experimental water tank main body;

[0041] The multi-stage flexible net structure includes: multiple flexible nets located in the experimental water tank main body and at least two flexible nets located on the apron. Each flexible net on the apron is arranged along a direction perpendicular to the outlet direction of the experimental water tank main body.

[0042] Please refer to Figure 5 and Figure 6, in some embodiments, the experimental platform further includes an experimental top platform, which includes a control room, a material bin, a gate, a water pool, and an artificial rainfall mechanism. The bottom of the material bin is inclined, and an openable gate is provided on one side of the material bin; the water pool is located on the side of the material bin away from the gate, and multiple rows of through holes are provided at the part where the water pool is adjacent to the material bin; the artificial rainfall mechanism is located above the material bin.

[0043] Further, the artificial rainfall mechanism includes a water supply water tank located on one side of the water pool, a plurality of rainfall brackets located above the material bin, and a plurality of rainfall nozzles are provided on each rainfall bracket. The water supply water tank is connected to the nozzles through a first water delivery pipeline. A first pressure pump is provided between the water supply water tank and the first water delivery pipeline, and a first valve is provided on the first water delivery pipeline.

[0044] Furthermore, the experimental platform further includes a monitoring system and a control system. The monitoring system includes a sensor module located at the bottom of the material bin and cameras arranged at the four corners of the upper part of the material bin; the control system includes a controller, and the controller is respectively connected to the nozzles, the first pressure pump, the first valve, the second pressure pump, and the second valve.

[0045] It can be understood that the sensor module includes a pore water pressure sensor (model: JUL-PW28), a normal stress sensor (model: MK-003), and a ground vibration sensor (model: CCUBE). The pore water pressure sensor is used to measure the pore water pressure in the soil inside the slope. The normal stress sensor can monitor the stress changes of the rock and soil mass under the action of factors such as self-weight, rainfall, and seepage. The ground vibration sensor can monitor the stress changes inside the landslide body in real time under the action of external forces; the role of the camera (model: DS-2CD3T86FWDV3-I3S) is to record the experimental process and monitor the change process of the slope body and the whole process of the landslide turning into a debris flow, including the deformation of the slope body, the generation and development of cracks, and how the landslide turns into a debris flow and the speed change, etc.

[0046] It can be understood that the monitoring system and the control system integrate the experimental monitoring, rainfall control, data measurement and acquisition and other multi-faceted and multi-level contents in the control room of the top platform during the simulated rainfall experiment to achieve the goal of automation and intelligence of artificial rainfall.

[0047] In this application, through the arrangement of multiple flexible nets within the main body of the experimental flume, when the debris flow fills up the previous flexible net and overflows, resulting in the failure of the structure, the subsequent multiple flexible nets can play a prevention and control role. The arrangement of at least two flexible nets on the apron can study the diffusion of the debris flow when it rushes out of the natural gully mouth and the prevention and control effect of the flexible nets on the debris flow. The configuration of multiple flexible nets can also effectively disperse the impact force of the debris flow, reduce the pressure on a single protective net, and extend the service life of the protection system. At the same time, the prevention and control effects of multiple flexible nets under different flow velocity conditions can provide a scientific basis for the graded early warning and prevention and control strategies of debris flow disasters. The entire multi-level flexible nets work together to study the multiple prevention and control of the flexible nets on the initiation process, acceleration process, deceleration process, and diffusion process of the debris flow.

[0048] Please refer to Figure 1 , in some embodiments, along the upstream to downstream of the main body of the experimental flume, the multiple flexible nets include a first flexible net, a second flexible net, a third flexible net, and a fourth flexible net arranged in sequence. The distance between the first flexible net and the top of the main body of the experimental flume is L1m, the distance between the first flexible net and the top of the main body of the experimental flume is L2m, the distance between the first flexible net and the top of the main body of the experimental flume is L3m, and the distance between the first flexible net and the top of the main body of the experimental flume is L4m.

[0049] Further, L1 is 12m to 20m, and for example, it can be 12m, 13m, 14m, 15m, 16m, 17m, 18m, 19m, 20m, etc.

[0050] Further, L2 is 48m to 60m, and for example, it can be 48m, 49m, 50m, 51m, 52m, 53m, 54m, 55m, 56m, 57m, 58m, 59m, 60m, etc.

[0051] Further, L3 is 85m to 105m, and for example, it can be 85m, 87m, 89m, 90m, 92m, 94m, 96m, 98m, 100m, 101m, 102m, 103m, 105m, etc.

[0052] Further, L4 is 110m to 130m, and for example, it can be 110m, 112m, 115m, 118m, 120m, 122m, 125m, 126m, 128m, 129m, 130m, etc.

[0053] Exemplarily, the distance between the first flexible net and the top of the main body of the experimental water tank is 17 m, the distance between the first flexible net and the top of the main body of the experimental water tank is 53 m, the distance between the first flexible net and the top of the main body of the experimental water tank is 97.5 m, and the distance between the first flexible net and the top of the main body of the experimental water tank is 119 m.

[0054] In some embodiments, the main body of the experimental water tank is sequentially provided with a first water tank with an angle of 30° - 35° and a second water tank with an angle of 12° - 18° from upstream to downstream. The first flexible net and the second flexible net are in the first water tank, and the third flexible net and the fourth flexible net are in the second water tank.

[0055] Exemplarily, the main body of the experimental water tank is sequentially provided with a first water tank with an angle of 32° and a second water tank with an angle of 16° from upstream to downstream. The first flexible net and the second flexible net are in the first water tank, and the third flexible net and the fourth flexible net are in the second water tank.

[0056] In some embodiments, hanging points are symmetrically arranged on both sides of the tank wall of the main body of the experimental water tank along the first flexible net.

[0057] In some embodiments, hanging points are symmetrically arranged on both sides of the tank wall of the main body of the experimental water tank along the second flexible net.

[0058] In some embodiments, hanging points are symmetrically arranged on both sides of the tank wall of the main body of the experimental water tank along the third flexible net.

[0059] In some embodiments, hanging points are symmetrically arranged on both sides of the tank wall of the main body of the experimental water tank along the fourth flexible net.

[0060] Further, the number of hanging points on each side of the tank wall of the main body of the experimental water tank where the first flexible net is located is 3 - 10, and for example, it can be 3, 4, 5, 6, 7, 8, 9, 10, etc.

[0061] Further, the number of hanging points on each side of the tank wall of the main body of the experimental water tank where the second flexible net is located is 3 - 10, and for example, it can be 3, 4, 5, 6, 7, 8, 9, 10, etc.

[0062] Further, the number of hanging points on each side of the tank wall of the main body of the experimental water tank where the third flexible net is located is 3 - 10, and for example, it can be 3, 4, 5, 6, 7, 8, 9, 10, etc.

[0063] Further, the number of hanging points on each side of the tank wall of the experimental water tank body for the fourth flexible net is 3 to 10, for example, it can be 3, 4, 5, 6, 7, 8, 9, 10, etc.

[0064] It can be understood that by setting the hanging points along the height, the prevention and control effects of flexible nets at different heights on debris flows can be studied.

[0065] Exemplarily, the first flexible net is symmetrically provided with 4 hanging points on the left and right. The bottom hanging point is 0.5 m vertically away from the bottom of the water tank. The spacing between the 3 hanging points in the direction perpendicular to the bottom of the water tank is 1 m, and the spacing between the other 3 hanging points in the vertical direction is 1.18 m. The second flexible net is symmetrically provided with 4 hanging points on the left and right. The bottom hanging point is 0.5 m vertically away from the bottom of the water tank, and the spacing between the other 3 hanging points in the vertical direction is 1.2 m. The third flexible net is symmetrically provided with 4 hanging points on the left and right. The bottom hanging point is 0.5 m vertically away from the bottom of the water tank, and the spacing between the other 3 hanging points in the vertical direction is 1 m. The fourth flexible net is symmetrically provided with 4 hanging points on the left and right. The bottom hanging point is 0.5 m vertically away from the bottom of the water tank, and the spacing between the other 3 hanging points in the vertical direction is 1 m.

[0066] Please refer to Figure 2 and Figure 3 Also exemplarily, the first flexible net is symmetrically provided with 7 hanging points on the left and right; the second flexible net is symmetrically provided with 7 hanging points on the left and right; the third flexible net is symmetrically provided with 7 hanging points on the left and right, and the fourth flexible net is symmetrically provided with 7 hanging points on the left and right.

[0067] Further, the distance from the bottommost hanging point of the first flexible net to the bottom of the experimental water tank body is 0.3 m to 0.7 m, for example, it can be 0.3 m, 0.4 m, 0.5 m, 0.6 m, 0.7 m, etc.

[0068] Further, the distance from the bottommost hanging point of the second flexible net to the bottom of the experimental water tank body is 0.3 m to 0.7 m, for example, it can be 0.3 m, 0.4 m, 0.5 m, 0.6 m, 0.7 m, etc.

[0069] Further, the distance from the bottommost hanging point of the third flexible net to the bottom of the experimental water tank body is 0.3 m to 0.7 m, for example, it can be 0.3 m, 0.4 m, 0.5 m, 0.6 m, 0.7 m, etc.

[0070] Further, the distance from the bottommost hanging point of the fourth flexible net to the bottom of the experimental water tank body is 0.3 m to 0.7 m, for example, it can be 0.3 m, 0.4 m, 0.5 m, 0.6 m, 0.7 m, etc.

[0071] Please refer to Figure 2 and Figure 3, Further, the first flexible net is vertically arranged at the hanging points on each side of the tank wall of the experimental flume main body or is perpendicular to the bottom of the experimental flume main body.

[0072] Further, the second flexible net is vertically arranged at the hanging points on each side of the tank wall of the experimental flume main body or is perpendicular to the bottom of the experimental flume main body.

[0073] Further, the third flexible net is vertically arranged at the hanging points on each side of the tank wall of the experimental flume main body or is perpendicular to the bottom of the experimental flume main body.

[0074] Further, the fourth flexible net is vertically arranged at the hanging points on each side of the tank wall of the experimental flume main body or is perpendicular to the bottom of the experimental flume main body.

[0075] It can be understood that hanging the net vertically helps to reduce the impact force of debris flow on the net; hanging the net vertically helps to reduce the momentum of debris flow.

[0076] It can be understood that the flexible net has a variety of controllable mounting methods, which has a constructive effect on the research of large-scale debris flow prevention and control.

[0077] Please refer to Figure 4 , in some embodiments, along the direction towards the outlet of the experimental flume main body, the width of the flexible net on the apron increases in sequence.

[0078] It can be understood that the width of the flexible net is along the direction perpendicular to the outlet of the experimental flume main body.

[0079] It can also be understood that the design of flexible nets at different angles can simulate the movement of debris flow in terrains at different angles, providing reference for the prevention and control of debris flow.

[0080] Further, each flexible net on the apron is supported by the hole positions on the apron and the support columns in the hole positions.

[0081] Please refer to Figure 4 , exemplarily, a total of two rows of hole positions are arranged on the apron for hanging the flexible net. The two rows of hole positions are symmetric with respect to the center line in the direction of the outlet of the experimental flume main body. There are 4 hole positions in the first row (marked 1-4) at a distance of 5 m from the outlet, and 6 hole positions in the second row (marked 5-10) at a distance of 10 m from the outlet. Hole positions 1 and 2 in the first row are symmetric with hole positions 4 and 3 respectively, where the distance between hole position 2 and hole position 3 is 10 m, and the distance between hole position 3 and hole position 4 is 5 m. Hole positions 5, 6, and 7 in the second row are symmetric with hole positions 10, 9, and 8 respectively, where the distance between hole position 7 and hole position 8 is 8 m, the distance between hole position 8 and hole position 9 is 8 m, and the distance between hole position 9 and hole position 10 is 5 m.

[0082] The above has introduced the embodiments of the present invention in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A multi-level flexible net structure for large-scale debris flow prevention and control, characterized by: Applied to a large-scale dynamic simulation experimental platform for mountain disasters, the experimental platform comprises an experimental water tank body and a protective tank located at the bottom of the experimental water tank body; The multi-stage flexible net structure includes: multiple flexible nets located in the experimental water tank body and at least two flexible nets located on the apron, and each flexible net on the apron is arranged along a direction perpendicular to the outlet of the experimental water tank body.

2. The multi-stage flexible net structure for large-scale debris flow prevention and control according to claim 1 is characterized in that: Along the upstream to downstream of the experimental water tank body, the multiple flexible nets include a first flexible net, a second flexible net, a third flexible net and a fourth flexible net arranged in sequence, the first flexible net is at a distance of L1m from the top of the experimental water tank body, the first flexible net is at a distance of L2m from the top of the experimental water tank body, the first flexible net is at a distance of L3m from the top of the experimental water tank body, and the first flexible net is at a distance of L4m from the top of the experimental water tank body.

3. The multi-stage flexible net structure for large-scale debris flow prevention and control according to claim 2 is characterized in that: L1 is 12m to 20m; and / or L2 is 48m to 60m; and / or L3 is 85m to 105m; and / or L4 is 110m~130m.

4. The multi-stage flexible net structure for large-scale debris flow prevention and control according to claim 2 is characterized in that: The experimental water tank body is sequentially provided with a first water tank with an angle of 30° to 35° and a second water tank with an angle of 12° to 18° from upstream to downstream. The first flexible net and the second flexible net are in the first water tank, and the third flexible net and the fourth flexible net are in the second water tank.

5. The multi-stage flexible net structure for large-scale debris flow prevention and control according to claim 2 is characterized in that: The first flexible net is symmetrically provided with hanging points along both sides of the wall of the experimental water tank body; and / or The second flexible net is symmetrically provided with hanging points along both sides of the wall of the experimental water tank body; and / or The third flexible net is symmetrically provided with hanging points along both sides of the wall of the experimental water tank body; and / or The fourth flexible net is symmetrically provided with hanging points along both sides of the groove wall of the experimental water tank body.

6. The multi-stage flexible net structure for large-scale debris flow prevention and control according to claim 5 is characterized in that: The number of the hanging points of the first flexible net on each side of the tank wall of the experimental tank body is 3 to 10; and / or The number of the hanging points of the second flexible net on each side of the tank wall of the experimental tank body is 3 to 10; and / or The number of the hanging points of the third flexible net on each side of the wall of the experimental water tank body is 3 to 10; and / or The number of the hanging points of the fourth flexible net located on each side of the tank wall of the experimental water tank body is 3 to 10.

7. The multi-stage flexible net structure for large-scale debris flow prevention and control according to claim 5 is characterized in that: The distance between the bottom hanging point of the first flexible net and the bottom of the experimental water tank body is 0.3m to 0.7m; and / or The distance between the bottom hanging point of the second flexible net and the bottom of the experimental water tank body is 0.3m to 0.7m; and / or The distance between the bottom hanging point of the third flexible net and the bottom of the experimental water tank body is 0.3m to 0.7m; and / or The distance between the bottom hanging point of the fourth flexible net and the bottom of the experimental water tank body is 0.3m to 0.7m.

8. The multi-stage flexible net structure for large-scale debris flow prevention and control according to claim 5 is characterized in that: The first flexible net is located at the hanging points on each side of the tank wall of the experimental tank body and is arranged vertically or perpendicular to the tank bottom of the experimental tank body; and / or The second flexible net is located at the hanging points on each side of the tank wall of the experimental tank body and is arranged vertically or perpendicular to the tank bottom of the experimental tank body; and / or The third flexible net is located at the hanging points on each side of the tank wall of the experimental tank body and is arranged vertically or perpendicular to the tank bottom of the experimental tank body; and / or The fourth flexible net is located at the hanging points on each side of the tank wall of the experimental tank body and is vertically arranged or perpendicular to the tank bottom of the experimental tank body.

9. The multi-stage flexible net structure for large-scale debris flow prevention and control according to claim 1, characterized in that: Along the outlet direction of the experimental water tank body, the width of the flexible net on the guard increases successively.

10. The multi-stage flexible net structure for large-scale debris flow prevention and control according to claim 9, characterized in that: Each of the flexible nets on the guard is supported by holes on the guard and support columns in the holes.

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