A simulation test device for slope collapse by coupling rainfall and slope foot scouring

Abstract

The invention relates to a bank slope collapse simulation test device coupling rainfall and foot scouring, wherein a water source is provided for a rainfall simulation test component and a foot scouring simulation test component through a water supply component; the rainfall simulation test component comprises a water pipe, a water pressure gauge, a valve, a bracket and an atomizing nozzle; the rainfall intensity is regulated by lifting and lowering the valve, the atomizing nozzle and the bracket; the foot scouring simulation test component comprises a shutoff valve, and the water level of the incoming water is changed through the shutoff valve to simulate the foot scouring process of different degrees; sand is piled at the bottom of the box body of the model box component as a bank slope; the rainfall process of different intensities is simulated by the rainfall simulation test component and the foot scouring simulation test component simulates the foot scouring process of different degrees, so as to realize the simulation of the bank slope collapse process in the model box component under the combined action of rainfall infiltration and foot scouring. The bank slope collapse process of different rainfall intensities and different foot scouring intensities can be simulated, and a test device coupling the two is designed.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy engineering, in particular to a bank slope collapse simulation test device coupling rainfall and slope foot scouring. Background Art

[0002] Gravity erosion and landslide of bank slopes (gullies) is one of the common ways of soil erosion in the basin. In severe cases, it may even cause major water and sand disasters in the basin. Bank collapse also contributes a large amount of sediment to the river, which is one of the main sources of river sediment. Since the new era, the phenomenon of bank collapse in the desert basin of the upper reaches of the Yellow River has been particularly prominent. Some researchers have found through remote sensing interpretation that the area of ​​bank collapse in the Qingtongxia to Toudaoguai river section from 1958 to 2008 was as high as 518.38km 2 . Therefore, the basin has become a major national strategic key governance area for ecological protection and high-quality development of the Yellow River Basin. At the same time, there are also problems caused by gully slope landslides in the middle and upper reaches of the Yellow River. In order to prevent gully slope landslides and protect the safety of terraces on the gully slopes, the "solidification of gullies and protection of plateaus" approach also requires the prevention and control of gully slope landslides. Therefore, conducting research on the erosion and sand production of bank slopes (gullies) has important theoretical and practical significance for enriching the theoretical and technical solutions of water-sediment models in the basin and the comprehensive management of soil and water loss in the basin. Therefore, bank slope (ditch) erosion and landslides have become a hot spot in the research on comprehensive management of soil and water loss in the basin.

[0003] Most natural slopes in the wild become unstable and collapse under the combined effects of rainfall and water scouring at the foot of the slope. However, in current research, there are few indoor rainfall simulation test devices and slope scouring simulation test devices that fully couple the two, which cannot better restore the real physical picture of slope collapse. Summary of the invention

[0004] The invention aims to provide a slope collapse simulation test device coupling rainfall and slope foot scouring, which can simulate different rainfall intensities, different slope foot scouring intensities and designs a test device coupling the two.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a slope collapse simulation test device coupling rainfall and slope foot scouring, comprising: a rainfall simulation test component, a model box component, a slope foot scouring simulation test component and a water supply component;

[0007] The water supply component is used to provide water source for the rainfall simulation test component and the slope foot scour simulation test component;

[0008] The rainfall simulation test assembly includes a water pipe, a water pressure gauge, a valve, a bracket and an atomizing nozzle; the water pipe is connected to the water supply assembly; the valve, the water pressure gauge and the atomizing nozzle are all arranged on the water pipe; the rainfall intensity is regulated by raising and lowering the valve, the atomizing nozzle and the bracket;

[0009] The slope foot scouring simulation test assembly includes a shutoff valve, through which the water level of the incoming water is changed to simulate the slope foot scouring process of different degrees;

[0010] The model box assembly is connected to the slope foot scour simulation test assembly, and sand is piled at the bottom of the box body of the model box assembly as a bank slope;

[0011] The rainfall simulation test component is used to simulate rainfall processes of different intensities, and the slope foot scour simulation test component is used to simulate slope foot scour processes of different degrees, so as to simulate the bank slope collapse process in the model box component under the combined effects of rainfall infiltration and slope foot scour.

[0012] Optionally, the water supply assembly is located on the lifting platform of the slope foot scour simulation test assembly, and includes a water supply tank, a partition plate, a first float, a second float, a lever, a right-angle connecting rod and a sliding water gate; the interior of the water supply tank is divided into a first space and a second space by the partition plate, and a water outlet is provided in the second space, and a sliding water gate is installed at the water outlet; the first float and the second float are connected through the lever, the mass of the first float is greater than that of the second float, and the lever uses the circular groove in the middle of the partition plate as a fulcrum; the right-angle connecting rod connects the second float and the sliding water gate respectively;

[0013] The first space is used to store water for the rainfall simulation test component, and the second space is used to store water for the slope foot scour simulation test component; when the water level of the water supply tank has not dropped, the sliding water gate blocks the water outlet; when the water level of the first space drops, the first float drops with the water level and drives the lever to lift the second float, and the second float drives the right-angle connecting rod to open the sliding water gate to start the slope foot scour simulation test component.

[0014] Optionally, the slope foot scour simulation test assembly includes: a lifting platform, a water tank, an extension water tank and a transition water tank;

[0015] The top of the extended water tank is fixed on the lifting platform, the upper part of the water tank is connected to the bottom of the slidable extended water tank, and the lower part of the water tank is connected to the transition water tank by bolts;

[0016] The flow rate of the incoming water is adjusted by adjusting the height of the lifting platform; the extended water tank can be extended and retracted accordingly with the change of the height of the lifting platform to adjust the inclination range of the water tank.

[0017] Optionally, a water sill is provided at the bottom of the extended water trough, and the water sill is a sloped type.

[0018] Optionally, the rainfall simulation test component further includes:

[0019] A first submersible pump, located in the water supply tank of the water supply assembly and connected to the water pipe;

[0020] A first pulley, located at the bottom of the bracket;

[0021] A plug is threadedly connected to the tail end of the water pipe and is used to ensure the airtightness of the rainfall simulation test assembly.

[0022] Optionally, a tailwater circulation component is also included;

[0023] The tail water circulation component includes a water collecting tank, a second submersible pump, a filter, a flocculation layer and a circulating water pipe; the water collecting tank is connected to the tail of the box body of the model box assembly, and is used to collect the tail water flowing out of the box body; the filter is located at the top layer of the water collecting tank, and is used to separate water and sand; the flocculation layer is located below the filter, and is used to purify the water quality; the second submersible pump is located at the bottom of the water collecting tank, and is used to pump the purified tail water into the second space of the water supply tank through the circulating water pipe to realize the recycling of the tail water.

[0024] Optionally, the model box assembly includes: a box body, located below the bracket; the box body is a square box body with open top and tail; the box body includes a top plate, a bottom plate and gate plates on both sides; the outer surface of the gate plate is marked with scale lines and grids for indicating the rainfall infiltration process; a rectangular hole is opened at the center of the top plate of the box body for connecting the slope foot scour simulation test assembly.

[0025] Optionally, a number of slots are evenly spaced on the top plate for clamping the gate plate to adjust the size of the bank slope.

[0026] Optionally, the model box assembly further includes:

[0027] A base, located at the bottom of the box, used to support the box and prevent the box from tilting;

[0028] An anti-skid pad is located between the box body and the base and is used to prevent the box body and the base from sliding.

[0029] Optionally, there are multiple shut-off valves, and each of the shut-off valves is located at the same height in the water supply tank.

[0030] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0031] The invention provides a bank slope collapse simulation test device for coupling rainfall and slope foot scouring, comprising: a rainfall simulation test component, a model box component, a slope foot scouring simulation test component and a water supply component; the water source is provided to the rainfall simulation test component and the slope foot scouring simulation test component by the water supply component; the rainfall simulation test component comprises a water pipe, a water pressure gauge, a valve, a bracket and an atomizing nozzle; the water pipe is connected to the water supply component; the valve, the water pressure gauge and the atomizing nozzle are all arranged on the water pipe; the rainfall intensity is regulated by lifting and lowering the valve, the atomizing nozzle and the bracket; the slope foot scouring simulation test component comprises a shut-off valve, and the water level of the incoming water is changed by the shut-off valve to simulate the slope foot scouring process of different degrees; the model box component is connected to the slope foot scouring simulation test component, and sand is piled at the bottom of the box body of the model box component as a bank slope; the rainfall process of different intensities is simulated by the rainfall simulation test component, and the slope foot scouring simulation test component simulates the slope foot scouring process of different degrees, so as to realize the simulation of the bank slope collapse process in the model box component under the joint action of rainfall infiltration and slope foot scouring. The invention can simulate the bank slope collapse process with different rainfall intensities and different slope foot scouring intensities, and designs a test device coupling the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 It is a structural schematic diagram of a slope collapse simulation test device for coupling rainfall and slope foot scouring according to the present invention;

[0034] Figure 2 It is a top view of the slope collapse simulation test device for coupling rainfall and slope foot scouring of the present invention;

[0035] Figure 3 It is a structural schematic diagram of the water supply assembly of the present invention;

[0036] Figure 4 It is a cross-sectional view of the interior of the extended water tank of the present invention;

[0037] Figure 5 It is a schematic diagram of the pulley structure of the present invention;

[0038] Figure 6 is a cross-sectional view of a tailwater treatment assembly of the present invention;

[0039] Figure 7 It is a schematic diagram of the three-dimensional structure of the box body of the model box assembly of the present invention.

[0040] Explanation of symbols:

[0041] Rainfall simulation test assembly-1, water pipe-11, water pressure gauge-12, valve-13, bracket-14, atomizing nozzle-15, first submersible pump-16, first pulley-17, plug-18; model box assembly-2, box body-21, top plate-211, slot-2111, bottom plate-212, gate plates on both sides-213, scale line-214, base-22, anti-slip mat-23, slope foot scour simulation test assembly-3, shut-off valve-31, lift Lowering platform-32, water tank-33, extension water tank-34, transition water tank-35, small steel-36, lifting knob-37, second pulley-38; water supply component-4, water supply tank-41, partition plate-42, first float-43, second float-44, lever-45, right-angle connecting rod-46, sliding water gate-47; tail water circulation component 5, water collecting tank-51, second submersible pump-52, filter screen-53, flocculation layer-54, circulating water pipe-55. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] The invention aims to provide a slope collapse simulation test device coupling rainfall and slope foot scouring, which can simulate different rainfall intensities, different slope foot scouring intensities and designs a test device coupling the two.

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] like Figure 1 and Figure 2 As shown, the slope collapse simulation test device for coupling rainfall and slope foot scouring of the present invention comprises: a rainfall simulation test component 1, a model box component 2, a slope foot scouring simulation test component 3 and a water supply component 4.

[0046] The water supply component 4 is used to provide water source for the rainfall simulation test component 1 and the slope foot scour simulation test component 3 .

[0047] The rainfall simulation test component 1 includes a water pipe 11, a water pressure gauge 12, a valve 13, a bracket 14 and an atomizing nozzle 15; the water pipe 11 is connected to the water supply component 4; the valve 13, the water pressure gauge 12 and the atomizing nozzle 15 are all arranged on the water pipe 11; the rainfall intensity is regulated by raising and lowering the valve 13, the atomizing nozzle 15 and the bracket 14.

[0048] The slope foot scour simulation test assembly 3 includes a shutoff valve 31, through which the water level of the incoming water is changed to simulate the slope foot scour process of different degrees.

[0049] The model box assembly 2 is connected to the slope foot scour simulation test assembly 3, and sand is piled at the bottom of the box of the model box assembly 2 as a bank slope.

[0050] The rainfall simulation test component 1 simulates rainfall processes of different intensities and the slope foot scouring simulation test component 3 simulates slope foot scouring processes of different degrees, so as to simulate the slope landslide process in the model box component 2 under the combined action of rainfall infiltration and slope foot scouring. The above device simulates the landslide process of the soil bank slope of the mountain torrent channel in the field under the coupling action of rainfall infiltration and lateral scouring of the slope foot by heavy rain and flood.

[0051] Furthermore, if Figure 3 As shown, the water supply component 4 is located on the lifting platform 32 of the slope foot scour simulation test component 3, and includes a water supply tank 41, a partition plate 42, a first float 43, a second float 44, a lever 45, a right-angle connecting rod 46, a sliding sluice gate 47 and a water inlet pipe; the interior of the water supply tank 41 is divided into a first space and a second space by the partition plate, and a water outlet is provided in the second space, and a sliding sluice gate 47 is installed at the water outlet; the first float 43 and the second float 44 are connected through the lever 45, the mass of the first float 43 is greater than that of the second float 44, the force arm of the first float 43 is longer than that of the second float 44, and the lever 45 uses the circular groove in the middle of the partition plate 42 as a fulcrum; the right-angle connecting rod 46 connects the second float 44 and the sliding sluice gate 47 respectively, and slide rails are provided on both sides of the sliding sluice gate 47 to limit its sliding path, and the water inlet pipe is connected to the water supply tank 41 through the circular hole on the upper left, serving as a channel for the water supply component to be connected to the external water source.

[0052] The first space is used to store water for the rainfall simulation test component, and the second space is used to store water for the slope foot scour simulation test component; before the test starts, the sliding sluice gate 47 completely blocks the water outlet, and the water level of the water supply tank does not drop; when the water level in the first space drops, the first float drops with the water level and drives the lever to lift the second float, and the second float drives the right-angle connecting rod to drive the sliding sluice gate to slowly open the gate to automatically start the slope foot scour simulation test component. Through the above-mentioned float-type water supply component, the entire test device is automatically implemented to scour the slope foot after rainfall for a period of time, which is more in line with the real situation. In the real scene, it rains for a period of time first, and then the rainwater converges to form a rainstorm flood and then the slope foot is scoured. The present invention can restore the occurrence conditions that conform to the real physical picture, and couple the slope collapse process under the rainfall infiltration and slope foot scour process.

[0053] Specifically, the slope foot scour simulation test assembly includes: a lifting platform 32 , a water tank 33 , an extension water tank 34 and a transition water tank 35 .

[0054] The top of the extended water trough 34 is fixed on the lifting platform, and the end of the extended water trough 34 completely wraps the top of the water trough 33, thereby connecting the lifting platform 32 and the water trough 33; the water output of the water supply tank 41 is controlled by changing the rotation angle and number of the shut-off valves 31, thereby changing the flushing water level in the model box 2; the upper part of the water trough is connected to the bottom of the slidable extended water trough, and the lower part of the water trough is connected to the transition water trough by bolts. When the height of the lifting platform 32 changes, the extended water trough 34 can be extended and retracted accordingly. After its position is determined, the position of the extended water trough 34 is fixed by a small steel clamp 36 to prevent it from continuing to slip. The cross-sectional view of the extended water trough 34 is shown in FIG. Figure 4 shown.

[0055] By adjusting the lifting knob 37, the height of the lifting platform 32 is changed, thereby changing the height of the water supply device 5 on it, and then changing the flow rate of the water flow in the model box 2

[0056] By adjusting the height of the lifting platform 32, the height of the water supply assembly 4 thereon is changed, thereby changing the flow rate of the water flow in the model box assembly 2; the extended water tank 34 can be extended and retracted accordingly with the change in the height of the lifting platform 32 to adjust the inclination range of the water tank 33. Among them, the height of the lifting platform 32 is adjusted by the lifting knob 37, and the flow rate of the incoming water is controlled by changing the height of the lifting platform 32. The water tank 33 is connected to the transition water tank 34, and the two are bolted, and the inclination angle can be adjusted within the range of 10-70°.

[0057] Preferably, a water barrier is provided at the bottom of the extended water trough 34, and the water barrier is sloped, so as to reduce the water loss when the incoming water flows from the extended water trough 34 into the water trough 33, and also make the connection between the two closer.

[0058] Furthermore, the rainfall simulation test assembly also includes:

[0059] The first submersible pump 16 is located in the water supply box of the water supply assembly 4 and is threadedly connected to the water pipe 11 to form a water supply system, which provides a stable and reliable water flow for rainfall and can also change the rainfall intensity by adjusting the water output of the submersible pump.

[0060] The first pulley 17 is located at the bottom of the bracket 14. The structural diagram of the first pulley is as shown in FIG. Figure 5 .

[0061] The plug 18 is threadedly connected to the tail end of the water pipe 11 to ensure the airtightness of the rainfall simulation test assembly.

[0062] Furthermore, the bracket 14 includes multiple branches, and the height can be manually adjusted by a lifting rod to meet the requirements of the rainfall height of each test, and the rain intensity can also be changed to provide support; the water pipe 11 is fixed to the bracket 14 by a nylon tie; an unlockable first pulley is installed at the foot of the bracket 14, and the first pulley is locked during the test, and the first pulley is unlocked for movement when the test is over or the position needs to be moved; the atomizing nozzle 15 is threadedly connected to the water pipe, the nozzle diameter is 20mm (4 points outer thread), the spacing between multiple nozzles is 50cm, and the spacing between each branch of the bracket 14 is also 50cm, thereby ensuring the uniformity of rainfall; at the same time, the rotating atomizing nozzle 15 can also change the rain intensity. Preferably, the valve is a spherical valve, connected to the main water pipe, used to control the water output. When the pointer of the water pressure gauge 12 is stable, it indicates that the water supply of the rainfall simulation test assembly is stable.

[0063] Furthermore, if Figure 1 and Figure 6 As shown, a tail water circulation component 5 is also included.

[0064] The tail water circulation component 5 includes a water collecting tank 51, a second submersible pump 52, a filter screen 53, a flocculation layer 54 and a circulating water pipe 55; the water collecting tank 51 is connected to the tail of the box body 21 of the model box component 2, and is used to collect the tail water containing sand flowing out of the box body 21; the filter screen 53 is located at the top layer of the water collecting tank 51, and is used to separate water and sand; the flocculation layer 54 is located below the filter screen 53, and is composed of an inorganic flocculant and activated carbon, and is used to purify water quality; the second submersible pump 52 is located at the bottom of the water collecting tank 51, and is used to pump the purified tail water into the second space of the water supply tank through the circulating water pipe 55 to achieve the recycling of tail water. The filter screen 53 is detachable, and the separated sediment can reflect the amount of sediment produced by bank slope erosion. After the test, the collected sediment can be dried to obtain the amount of sediment produced by bank slope erosion. The filter screen 53 on the top of the water collecting tank 51 is a detachable filter screen, and the filter screen 53 is 2000 mesh, and the filter hole diameter is about 0.008 mm.

[0065] Furthermore, if Figure 7 As shown, the model box assembly 2 includes: a box body 21, which is located below the bracket 14; the box body 21 is a square box body with an open top and tail; the box body 21 includes a top plate 211, a bottom plate 212 and gate plates 213 on both sides; the outer surface of the gate plate 213 is marked with scale lines 214 and a grid for indicating the rainfall infiltration process; a rectangular hole is opened at the center of the top plate 211 of the box body 21 for connecting the slope foot scouring simulation test assembly 3. The box body 21 is made of organic glass, and a transition water tank 35 is connected to the periphery of the rectangular hole to facilitate the upstream water to flow into the box body 21 to scour the slope foot. The gate plates 213 made of organic glass on both sides of the box body are detachable. Because the position of the slope foot scouring is fixed, the slope foot position is used as a fixed point. The positions of the gate plates 213 on both sides are determined according to the bank slope size of the test design to meet the similarity ratio of different bank slope models.

[0066] Preferably, if Figure 7 As shown, a number of slots 2111 are evenly spaced on the top plate 211 for clamping the gate plate 213 to adjust the size of the bank slope.

[0067] Preferably, if Figure 1 and Figure 2 As shown, the model box assembly 2 also includes:

[0068] The base 22 is located at the bottom of the box 21, and is used to support the box 21 and prevent the box 21 from tilting. In a specific embodiment of the present invention, there are three groups of bases 22, which are respectively located at the front, middle and rear of the box 21, and clamp the box 21 to support it.

[0069] The anti-skid pad 23 is located between the box body 21 and the base 22 to prevent the box body 21 and the base 22 from sliding.

[0070] Furthermore, there are multiple shutoff valves 31, and each shutoff valve 31 is located at the same height in the water supply tank. In a specific embodiment of the present invention, the shutoff valve 31 is connected to the bottom of the water supply tank. There are three shutoff valves 31 and they are located at the same height. The shutoff valve in the middle has a sliding sluice on the inner wall of the water supply tank, which is used in the coupling test of rainfall infiltration and slope foot scouring; the shutoff valves on both sides have no sliding sluice to block water, and are used alone in the slope foot scouring test; the shutoff valve 31 is used to adjust the water output, and the water output is changed by changing the rotation angle of the shutoff valve 31 and the number of the shutoff valves 31, thereby changing the water level of the upstream water.

[0071] Furthermore, if Figure 1 As shown, a second pulley 38 is installed at the bottom of the lifting platform 32 to facilitate movement.

[0072] Furthermore, two high-definition cameras can be installed on the top and side of the model box assembly 2, and after the test starts, the dual cameras will record the entire process of the bank slope collapse.

[0073] Technical effects of the present invention:

[0074] 1) The present invention can adjust the rainfall intensity by lifting and lowering the valve, atomizing nozzle and bracket of the rainfall simulation test assembly, monitor the rainfall intensity change by a water pressure gauge, and simulate the slope landslide process under different rainfall intensities; change the upstream water flow rate by changing the height of the lifting platform of the slope foot scour test assembly, and change the water level of the incoming water by the interception valve to simulate the slope landslide process under different slope foot scour degrees.

[0075] 2) When the rainfall simulation test assembly of the present invention works in conjunction with the model box assembly, it can simulate the bank slope collapse under different rainfall intensities; when the slope foot scour test assembly of the present invention works in conjunction with the model box assembly, it can simulate the bank slope collapse under different slope foot scour degrees.

[0076] 3) After the rainfall simulation test component and the model box component work together for a period of time, the slope foot scouring simulation test component is started to simulate the slope collapse process under the coupling effect of rainfall and slope foot scouring. That is, the rainfall simulation test component and the slope foot scouring simulation test component work together automatically through the float-type water supply component, and the opening and closing of the sliding sluice gate is controlled by the float with the rise and fall of the water level, so as to achieve rainfall first, rainwater infiltration in the slope, and water flow down and scour after a period of time, which eventually leads to the collapse of the slope. It is consistent with the real situation that rainfall first occurs and a long period of flow generation and convergence process is required to form a rainstorm flood. Therefore, the present invention restores the occurrence conditions that conform to the real physical picture, simulates the slope collapse process under the coupling effect of rainfall infiltration, slope foot scouring and the two, and more realistically restores the physical process of natural slope collapse in the wild.

[0077] 4) The test device described in the present invention can simultaneously realize the slope collapse simulation test device of different sizes and under different working conditions. The model box component simulates the mountain torrent ditch. Before the test starts, sand is laid on the side of the model box to construct an artificial slope. Then the test device is turned on to carry out collapse tests and measurements. The coordinate grid on the side wall of the model box is used to mark the shape of the collapse surface.

[0078] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0079] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and 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 methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A slope collapse simulation test device coupling rainfall and slope foot scouring, characterized in that: include: Rainfall simulation test assembly, model box assembly, slope foot scour simulation test assembly and water supply assembly; The water supply component is used to provide water source for the rainfall simulation test component and the slope foot scour simulation test component; The rainfall simulation test assembly includes a water pipe, a water pressure gauge, a valve, a bracket and an atomizing nozzle; the water pipe is connected to the water supply assembly; the valve, the water pressure gauge and the atomizing nozzle are all arranged on the water pipe; the rainfall intensity is regulated by raising and lowering the valve, the atomizing nozzle and the bracket; The slope foot scouring simulation test assembly includes a shutoff valve, through which the water level of the incoming water is changed to simulate the slope foot scouring process of different degrees; The model box assembly is connected to the slope foot scour simulation test assembly, and sand is piled at the bottom of the box body of the model box assembly as a bank slope; The rainfall simulation test component simulates rainfall processes of different intensities and the slope foot scour simulation test component simulates slope foot scour processes of different degrees, so as to simulate the bank slope collapse process in the model box component under the combined effects of rainfall infiltration and slope foot scour; The water supply assembly is located on the lifting platform of the slope foot scour simulation test assembly, and includes a water supply tank, a partition plate, a first float, a second float, a lever, a right-angle connecting rod and a sliding water gate; the interior of the water supply tank is divided into a first space and a second space by the partition plate, and a water outlet is provided in the second space, and a sliding water gate is installed at the water outlet; the first float and the second float are connected through the lever, the mass of the first float is greater than that of the second float, and the lever uses the circular groove in the middle of the partition plate as a fulcrum; the right-angle connecting rod connects the second float and the sliding water gate respectively; The first space is used to store water for the rainfall simulation test component, and the second space is used to store water for the slope foot scour simulation test component; when the water level of the water supply tank has not dropped, the sliding water gate blocks the water outlet; when the water level of the first space drops, the first float drops with the water level and drives the lever to lift the second float, and the second float drives the right-angle connecting rod to open the sliding water gate to start the slope foot scour simulation test component.

2. The device for simulating bank slope collapse by coupling rainfall and slope foot scouring according to claim 1 is characterized in that: The slope foot scour simulation test assembly includes: a lifting platform, a water tank, an extension water tank and a transition water tank; The top of the extended water tank is fixed on the lifting platform, the upper part of the water tank is connected to the bottom of the slidable extended water tank, and the lower part of the water tank is connected to the transition water tank by bolts; The flow rate of the incoming water is adjusted by adjusting the height of the lifting platform; the extended water tank can be extended and retracted accordingly with the change of the height of the lifting platform to adjust the inclination range of the water tank.

3. The device for simulating bank slope collapse by coupling rainfall and slope foot scouring according to claim 2 is characterized in that: A water sill is arranged at the bottom of the extended water trough, and the water sill is a slope type.

4. The device for simulating bank slope collapse by coupling rainfall and slope foot scouring according to claim 1 is characterized in that: The rainfall simulation test assembly also includes: A first submersible pump, located in the water supply tank of the water supply assembly and connected to the water pipe; A first pulley, located at the bottom of the bracket; A plug is threadedly connected to the tail end of the water pipe and is used to ensure the airtightness of the rainfall simulation test assembly.

5. The device for simulating bank slope collapse by coupling rainfall and slope foot scouring according to claim 1, characterized in that: Also included are tailwater circulation components; The tail water circulation component includes a water collecting tank, a second submersible pump, a filter, a flocculation layer and a circulating water pipe; the water collecting tank is connected to the tail of the box body of the model box assembly, and is used to collect the tail water flowing out of the box body; the filter is located at the top layer of the water collecting tank, and is used to separate water and sand; the flocculation layer is located below the filter, and is used to purify the water quality; the second submersible pump is located at the bottom of the water collecting tank, and is used to pump the purified tail water into the second space of the water supply tank through the circulating water pipe to realize the recycling of the tail water.

6. The device for simulating bank slope collapse by coupling rainfall and slope foot scouring according to claim 1, characterized in that: The model box assembly includes: a box body, located below the bracket; the box body is a square box body with open top and tail; the box body includes a top plate, a bottom plate and gate plates on both sides; the outer surface of the gate plate is marked with scale lines and grids for indicating the rainfall infiltration process; a rectangular hole is opened at the center of the top plate of the box body for connecting the slope foot scour simulation test assembly.

7. The device for simulating bank slope collapse by coupling rainfall and slope foot scouring according to claim 6, characterized in that: A number of slots are evenly spaced on the top plate for clamping the gate plate to adjust the size of the bank slope.

8. The device for simulating bank slope collapse by coupling rainfall and slope foot scouring according to claim 6, characterized in that: The model box assembly also includes: A base, located at the bottom of the box, used to support the box and prevent the box from tilting; An anti-skid pad is located between the box body and the base and is used to prevent the box body and the base from sliding.

9. The device for simulating bank slope collapse by coupling rainfall and slope foot scouring according to claim 1, characterized in that: There are multiple shut-off valves, and each shut-off valve is located at the same height in the water supply tank.

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