Slope protection circulating water tank test device and method for simulating water flow scouring and scouring

Abstract

The invention relates to the technical field of water conservancy projects, and discloses a slope protection circulating water tank test device and method for simulating water flow scouring and scouring, and the device comprises a test water tank, a gradual change pipeline device, a scouring cover plate, a water storage device, a filtering baffle plate, a circulating water power system and a scouring bearing platform. The multi-gradient flow velocity washout test is realized; an angle-adjustable scouring bearing platform and a wave making device are utilized to simulate the scouring effect of different wave parameters on the slope protection. The device is connected through a flange and a bolt, the structure is stable, the flow guide plate and the energy dissipation grating eliminate water flow afterwave interference, the transparent scouring cover plate facilitates real-time observation, and the test method comprises the steps of quantitatively weighing the mass of fragments, recording morphological changes and dynamically adjusting wave parameters. The problem that multi-angle scouring and multi-flow-velocity gradient scouring cannot be simulated and the influence of residual waves cannot be eliminated in the prior art is solved, and reliable data support is provided for ecological slope protection engineering design.

Description

Technical Field

[0001] The invention relates to the technical field of circulating water flume tests simulating water flow scouring and washing slope protection, and in particular to a circulating water flume test device and method for simulating water flow scouring and washing slope protection. Background Art

[0002] In fields such as water conservancy projects and ecological and environmental protection, the scouring and scouring effects of water on slope protection are a significant issue. During flood season, water scour can carry away soil particles from the slope protection surface, causing severe soil and water loss. With increasing awareness of ecological and environmental protection, new types of concrete ecological slope protection have emerged, offering superior durability compared to traditional slope protection. Therefore, studying the ability of this new type of slope protection to resist water scouring and scouring is of great significance.

[0003] At present, certain results have been achieved in the experimental devices for simulating water scouring slope protection, but these technologies still have many shortcomings, such as the inability to adjust the scouring angle and the inability to solve the impact of water flow aftermath on simulation accuracy.

[0004] Therefore, a circulating water tank test device and method for simulating water flow scouring and washing slope protection are proposed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a circulating water flume test device and method for simulating water flow scouring and washing slope protection to solve the problems raised in the background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a circulating water tank test device simulating water flow scouring and washing slope protection, comprising: a test water tank, the outer side of which is welded with a square tube to enhance the bearing capacity, the left side is welded with a circular pipe, and the bottom is provided with a sample placement groove for fixing the ecological slope protection sample; a gradient pipe device, connected to the circular pipe through a flange, and its cross-section gradually changes from a circle to a rectangle to stabilize the water flow; a scouring cover plate, made of transparent acrylic material, fixed to the scouring connection plate above the sample placement groove by bolts, forming an observable scouring channel, and the scouring connection plate is connected to the circular pipe through a flange, and the ... the scouring cover plate is made of transparent acrylic material, fixed to the scouring connection plate above the sample placement groove by bolts, and the scouring channel is observable. A collection device is connected to the right side of the plate by bolts; the water storage device is connected to the test water tank through a guide plate, a drain valve is provided at the bottom, and a filter baffle is plugged in to filter debris; the circulating water power system includes a water pump device, a first valve device and a second valve device, and a closed-loop pipeline is formed by a flange-connected elbow device and a straight pipe device, and an electromagnetic flowmeter and a high-definition camera are provided in the pipeline to monitor the flow; the scouring bearing platform device is connected to the circular pipe through a flange, the inclination angle can be adjusted and it is plugged into the digital wave height device, cooperating with the wave-making device to simulate the scouring effect of waves on the slope protection.

[0007] Preferably, the guide plate of the test water tank is an arc-shaped structure to guide the water flow to enter the water storage device smoothly, and the inner wall of the water storage device is provided with an energy dissipation grid to eliminate the residual waves of the water flow.

[0008] Preferably, a sealing strip is provided between the flushing cover plate and the flushing connecting plate, and is fixed by detachable bolts to form a flushing channel that can be quickly disassembled and assembled. The filter baffle is a multi-layer stainless steel mesh structure, including a coarse filter layer and a fine filter layer, which respectively intercept debris of different particle sizes.

[0009] Preferably, the bent pipe device includes a first bent pipe, a second bent pipe and a third bent pipe, and the straight pipe device includes a first straight pipe, a second straight pipe and a third straight pipe; one end of the first bent pipe is connected to the water pump device, and the other end is connected to the first straight pipe, one end of the second bent pipe is connected to the second straight pipe, and the other end is connected to the third straight pipe, one end of the third bent pipe is connected to the third straight pipe, and the other end is connected to the second valve device.

[0010] Preferably, the water pump device includes a variable frequency motor and a centrifugal pump, and the flow rate can be adjusted steplessly by adjusting the motor speed.

[0011] Preferably, an angle adjustment mechanism is provided at the bottom of the brush carrying platform device, and the platform inclination angle can be accurately adjusted to 0°~45° through a worm gear assembly.

[0012] Preferably, the wave-making device includes a programmable controller, which generates waves with a wave height range of 0.1m~0.5m and a wavelength range of 0.5m~2m by adjusting the frequency and amplitude of the push plate.

[0013] Preferably, the collecting device is formed by welding a metal nylon wire mesh and a flange, and the mesh diameter is 1mm~5mm, and is used for quantitatively collecting the sample fragments after flushing.

[0014] In addition, the present invention also discloses a method for simulating water flow scouring and washing slope protection circulating water flume test device, comprising the following steps: Step 1: Test preparation: Place the ecological slope protection sample in a drying oven and dry it to constant weight, and record the initial mass; check the sealing of the test water tank to ensure that the scouring cover plate and the scouring connecting plate are tightly fitted with sealing strips; Step 2: System calibration: Pour clean water into the water storage device to the calibrated water level, start the water pump device and run it at no load for 10 minutes. Use the electromagnetic flowmeter to calibrate the flow error, and adjust the variable frequency motor to make the flow fluctuation rate less than ±2%; Step 3: Multi-gradient flow rate scour test: adjust the opening of the first valve device and the second valve device to 30%-80%, set the flow rate in stages to 0.5m / s, 1.5m / s, and 3.0m / s, and each stage lasts for 30 minutes; continuously capture the slope protection surface morphology with a high-definition camera, and collect the mass of the debris in the collection device every 5 minutes to calculate the cumulative loss rate; Step 4: Adjust the brush angle. Remove the gradient pipe device and connect the brush support platform to the circular pipe via a flange. Use the worm gear assembly to adjust the platform's tilt angle to 15°, 30°, and 45°. Use a digital level to verify that the angle deviation is less than ±0.5°. Step 5: Dynamic wave parameter simulation: Input the target wave height, wavelength, and wave period into the programmable controller of the wave generator, and activate the push plate to generate regular waves. The wave parameters are monitored in real time through the digital wave height device. If the deviation exceeds 5%, the push plate frequency and amplitude are automatically adjusted. Step 6: Synchronous data acquisition: During the scouring test, the displacement images of the slope protection captured by the high-definition camera, the fragment mass data of the weighing device, and the wave parameters of the digital wave height device are synchronously recorded to generate time-displacement and time-mass loss rate curves; Step 7: Elimination and resetting of residual waves. After the test, open the drain valve (501) to drain the water, remove the washing and brushing platform, place a leveling water baffle above the sample placement tank, start the water pump device to flush the pipeline at 0.1m / s for 5 minutes to remove residual debris.

[0015] Furthermore, in step three, if the cumulative loss rate exceeds 20%, the test is terminated immediately and the critical point of slope protection failure is marked; in step five, when the wave parameters are adjusted, the push plate frequency range is 1Hz~5Hz, the amplitude range is 10cm~30cm, and after each parameter adjustment, it is allowed to run stably for 2 minutes before collecting data.

[0016] The present invention has the following beneficial effects: 1. This invention addresses several technical deficiencies in existing technologies for simulating water scouring and flushing slope protection. Specifically, existing technologies cannot adjust the flushing angle while maintaining stability, cannot effectively simulate the scouring process of water on ecological slope protection, and cannot address the issue of water flow aftershocks affecting simulation accuracy. 2. The present invention effectively combines various devices together through a large number of flanges and bolt connections, maintains overall stability, and can efficiently simulate the scouring process of water flow on ecological slope protection; 3. The water flow of the present invention is stable and has multiple transition sections, which effectively eliminates the influence of turbulence on the test and makes the flow velocity distribution of the section more stable and reasonable; 4. The present invention can effectively simulate the scouring effect of water flow on slope protection, and can study the impact of water flow scouring on ecological slope protection from the perspective of multiple variables; 5. The guide plate design of the test water tank of the present invention guides the water flow with excess energy into the water storage device, eliminating the impact of the excess energy of the water flow on the water circulation; 6. The research results of this invention can provide a reference for the design of river ecological slope protection projects and provide important theoretical and technical support for protecting my country's ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the flushing test structure of the present invention; Figure 2 A top view of the scour test structure of the present invention; Figure 3 This is a schematic diagram of the structure of the scouring test of the present invention; Figure 4 It is a structural schematic diagram of the test water tank of the present invention; Figure 5 It is a structural schematic diagram of the gradual change pipeline of the present invention; Figure 6 It is a structural schematic diagram of the water storage device of the present invention; Figure 7 It is a structural schematic diagram of the filter baffle device of the present invention; Figure 8 This is a schematic structural diagram of the overall device of the brush carrying platform of the present invention; Figure 9 It is a structural schematic diagram of the wave-making device of the present invention; In the figure: test water tank 1, square tube 101, circular pipe 102, product placement tank 103, scouring connecting plate 104, guide plate 105, drain switch 106, gradient pipe device 2, scouring cover plate 3, collecting device 4, metal nylon wire mesh 401, flange 402, water storage device 5, drain valve 501, filter baffle 6, first valve device 7, water pump device 8, centrifugal pump 801, motor 802, first elbow device 9, first straight pipe device 10, electromagnetic flowmeter 11, high-definition camera 12, second straight pipe device 13, second elbow device 14, third straight pipe device 15, third elbow device 16, second valve device 17, weighing device 18, lifting device 19, test water tank bracket 20, first pipe support device 21, second pipe support device 22, third pipe support device 23, washing and brushing bearing platform 24, digital wave height device 25, leveling water baffle 26, wave making device 27. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and examples: Example 1 like Figure 1-9 As shown, a circulating water flume test device simulating water flow scouring and scouring of slope protection comprises: a test flume 1, a square tube 101 is welded on the outside of the test flume to enhance the bearing capacity, a circular pipe 102 is welded on the left side, and a sample placement groove 103 is provided at the bottom for fixing the ecological slope protection sample; a gradient pipe device 2 is connected to the circular pipe 102 through a flange, and its cross section gradually changes from a circle to a rectangle to stabilize the water flow; a scouring cover plate 3 is made of transparent acrylic material and is fixed to the scouring connecting plate 104 above the sample placement groove 103 by bolts to form an observable scouring channel, and the right side of the scouring connecting plate 104 is connected to a collecting plate by bolts. The collecting device 4; the water storage device 5 is connected to the test water tank 1 through the guide plate 105, the bottom of which is provided with a drain valve 501, and the filter baffle 6 is plugged in to filter debris; the circulating water power system includes a water pump device 8, a first valve device 7 and a second valve device 17, and a closed-loop pipeline is formed by a flange-connected elbow device and a straight pipe device, and an electromagnetic flowmeter 11 and a high-definition camera 12 are provided in the pipeline to monitor the flow; the scouring bearing platform device 24 is connected to the circular pipe 102 through a flange, the inclination angle can be adjusted and it is plugged into the digital wave height device 25, and cooperates with the wave-making device 27 to simulate the scouring effect of waves on the slope protection.

[0019] In this example, the main body of the test water tank 1 is set to be rectangular and made of aluminum plate. The scouring cover plate 3 is rectangular and made of acrylic material. It is a transparent material to facilitate observation of surface morphological changes of the ecological slope protection sample.

[0020] Furthermore, the guide plate 105 guides the water flow into the water storage device 5. A drain valve 501 is provided below the water storage device. The water storage device 5 is connected to the filter baffle 6 by plugging. The filter baffle 6 can filter debris in the water flow. The water storage device 5 is connected to the first valve device 7 by a flange. The first valve device 7 is connected to the water pump device 8 by a flange. The water pump device 8 is connected to the first elbow device 9 by a flange. The first elbow device 9 is connected to the first straight pipe device 10 by a flange. The first straight pipe device 10 is connected to the electromagnetic flowmeter 11 Through flange connection, a high-definition camera 12 is provided next to the electromagnetic flowmeter 11 for monitoring flow data. The electromagnetic flowmeter 11 is connected to the second straight pipe device 13 through a flange, the second straight pipe device 13 is connected to the second bent pipe device 14 through a flange, the second bent pipe device 14 is connected to the third straight pipe device 15 through a flange, the third straight pipe device 15 is connected to the third bent pipe device 16 through a flange, the third bent pipe device 16 is connected to the second valve device 17 through a flange, and the second valve device 17 is connected to the circular pipe 102 through a flange.

[0021] Furthermore, the collecting device 4 is formed by welding a metal nylon wire mesh 401 and a flange 402, and its function is to collect sample fragments lost after the ecological slope protection sample is washed by water.

[0022] Furthermore, the first valve device 7 and the second valve device 17 are stop valves for adjusting the flow in the pipeline, thereby controlling the flow rate in the pipeline.

[0023] According to the circulating water tank test device for simulating water flow scouring and washing slope protection as described in claim 3, it is characterized in that the water pump device 8 is composed of a centrifugal pump 801 and a motor 802, which is used to realize the circulation of the fluid.

[0024] Furthermore, a test water tank bracket 20 is provided below the test water tank 1 for placing the test water tank 1 .

[0025] Furthermore, a first pipe supporting device 21 , a second pipe supporting device 22 , and a third pipe supporting device 23 are respectively provided below the first straight pipe device 10 , the second straight pipe device 13 , and the third straight pipe device 15 to provide support for the straight pipes.

[0026] Furthermore, when performing the scouring test, the circular pipe 102 is connected to the scouring bearing platform device 24 through a flange, the scouring bearing platform 24 is connected to the digital wave height device 25 through plugging, the leveling water baffle 26 is placed above the sample placement tank 103, and the wave generating device 27 is placed above the sample placement tank (103; Example 2 In another preferred embodiment, based on the above-mentioned embodiment 1, as shown in the figure, the present invention further discloses a method for simulating water flow scouring and washing slope protection circulating water flume test device, comprising the following steps: Step 1: Test preparation: Place the ecological slope protection sample in a drying oven and dry it to constant weight, and record the initial mass; check the sealing of the test water tank to ensure that the scouring cover plate and the scouring connecting plate are tightly fitted with sealing strips; Step 2: System calibration: Pour clean water into the water storage device to the calibrated water level, start the water pump device and run it at no load for 10 minutes. Use the electromagnetic flowmeter to calibrate the flow error, and adjust the variable frequency motor to make the flow fluctuation rate less than ±2%; Step 3: Multi-gradient flow rate scour test: adjust the opening of the first valve device and the second valve device to 30%-80%, set the flow rate in stages to 0.5m / s, 1.5m / s, and 3.0m / s, and each stage lasts for 30 minutes; continuously capture the slope protection surface morphology with a high-definition camera, and collect the mass of the debris in the collection device every 5 minutes to calculate the cumulative loss rate; Step 4: Adjust the brush angle. Remove the gradient pipe device and connect the brush support platform to the circular pipe via a flange. Use the worm gear assembly to adjust the platform's tilt angle to 15°, 30°, and 45°. Use a digital level to verify that the angle deviation is less than ±0.5°. Step 5: Dynamic wave parameter simulation: Input the target wave height, wavelength, and wave period into the programmable controller of the wave generator, and activate the push plate to generate regular waves. The wave parameters are monitored in real time through the digital wave height device. If the deviation exceeds 5%, the push plate frequency and amplitude are automatically adjusted. Step 6: Synchronous data acquisition: During the scouring test, the displacement images of the slope protection captured by the high-definition camera, the fragment mass data of the weighing device, and the wave parameters of the digital wave height device are synchronously recorded to generate time-displacement and time-mass loss rate curves; Step 7: Elimination and resetting of residual waves. After the test, open the drain valve (501) to drain the water, remove the washing and brushing platform, place a leveling water baffle above the sample placement tank, start the water pump device to flush the pipeline at 0.1m / s for 5 minutes to remove residual debris.

[0027] Furthermore, in step three, if the cumulative loss rate exceeds 20%, the test is terminated immediately and the critical point of slope protection failure is marked; in step five, when the wave parameters are adjusted, the push plate frequency range is 1Hz~5Hz, the amplitude range is 10cm~30cm, and after each parameter adjustment, it is allowed to run stably for 2 minutes before collecting data.

[0028] Example 3 In another preferred embodiment, based on the above embodiments 1 and 2, this embodiment describes in detail the specific structure of a circulating water tank test device that simulates water flow scouring and washing slope protection.

[0029] 1. Structural composition of the flushing device The flushing device of this embodiment mainly includes the following parts: a test water tank 1, a gradient pipe device 2, a flushing cover plate 3, a collection device 4, a water storage device 5, a filter baffle 6, etc. Test water tank 1: As the main part of the entire flushing device, the test water tank 1 is made of aluminum plate, and square tubes 101 are welded around it to increase the load-bearing capacity and stability of the test water tank; a circular pipe 102 is welded on the left side of the test water tank (1), and the circular pipe is made of aluminum plate; a sample placement tank 103 is welded below the test water tank for storing ecological slope protection samples; a flushing connection plate 104 is welded above the sample placement tank 103, and the flushing connection plate 104 is made of aluminum plate and is used to form a flushing channel; a guide plate 105 is welded on the right side of the test water tank 1, and the guide plate is used to guide the water flow; a drain switch 106 is installed at the bottom of the test water tank 1 for draining the water body.

[0030] Gradual pipe device 2: connected to the circular pipe 102 through a flange, the gradual pipe device 2 is welded from steel plates and the surface is treated with rust prevention; the gradual pipe device 2 changes from a circle to a rectangle and then gradually decreases in height.

[0031] Scour cover plate 3: The scour cover plate 3 is made of acrylic material, which is a transparent material, making it easy to observe the surface scour condition of the slope protection sample; the scour cover plate 3 and the scour connecting plate 104 are connected by bolts to form a scour channel together.

[0032] Collection device: The collection device is composed of a metal nylon steel mesh 401 and a flange 402. The flange 402 is connected to the scouring connecting plate 104 through a flange; the metal nylon steel mesh 401 is used to collect sample fragments.

[0033] Water storage device 5: The water storage device 5 is welded from stainless steel plates and is used to store water, thereby eliminating the residual energy of the water. The water storage device 5 is provided with a drain valve 501 for draining the water.

[0034] Filter baffle 6: The filter baffle 6 is made of stainless steel and is connected to the water storage device 5 by plugging and unplugging, and is used to filter debris in the water body.

[0035] Water power system: The water power system consists of a first valve device 7 and a water pump device 8. The first valve device 7 controls the water flow in the pipeline by adjusting the valve opening; the water pump device 8 provides power for the water power system and consists of a centrifugal pump 801 and a motor 802. The flow of the centrifugal pump 801 is continuous and uniform, the operation is stable, and the flow is easy to adjust.

[0036] External pipeline system: The external pipeline system consists of a first curved pipe 9, a first straight pipe 10, an electromagnetic flowmeter 11, a high-definition camera 12, a second straight pipe 13, a second curved pipe 14, a third straight pipe 15, a third curved pipe 16, and a second valve device 17, and is used for connecting external pipelines; the electromagnetic flowmeter 11 is used to monitor changes in flow in the pipeline; the high-definition camera 12 is used to record changes in flow in the pipeline.

[0037] Lifting and weighing system: The lifting and weighing system consists of a weighing device 18 and a lifting device 19. The lifting device 19 is used to move the slope protection sample and the collecting device 4; the weighing device is used to weigh the sample and the sample fragments in the collecting device 4.

[0038] External support system: The external support system consists of a test water tank bracket 20, a first pipe support device 21, a second pipe support device 22, and a third pipe support device 23, which are used to support various devices and pipes; the test water tank bracket 20 is welded from square tubes and is used to place the test water tank 1, provide support for the test water tank, and enhance the ability of the sample placement tank 103 to resist deformation; the first pipe support device 21, the second pipe support device 22, and the third pipe support device 23 are all made of square tubes and aluminum plates processed and welded, and are used to provide support for the entire external pipe system.

[0039] 2. The structure of the washing device In addition to the test water tank 1, square tube 101, circular pipe 102, sample placement trough 103, flushing connecting plate 104, guide plate 105, drainage switch 106, high-definition camera 12, lifting device 19, and test water tank bracket 20 mentioned in the above-mentioned flushing device, the main body of the flushing device in this example also has a flushing bearing platform device 24, a digital wave height device 25, a leveling water baffle 26, a wave-making device 27, etc.

[0040] The scrubbing system consists of a scrubbing carrying platform device 24, a digital wave height device 25, a leveling water retaining plate 26, and a wave-making device 27. The scrubbing carrying platform 24 is used to store scrubbing test samples; the digital wave height device 25 is installed in the scrubbing carrying platform 24 through a plug-in connection, and is used to monitor wave-related data in the scrubbing test; the leveling water retaining plate 26 is used to level the test platform and block the sample placement groove 103 to reduce the impact on the waves; the wave-making device 27 affects the wave height, wavelength, and wave period of the waves by changing the frequency and amplitude, and is used to create waves.

[0041] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A circulating water tank test device for simulating water flow scouring and washing slope protection, characterized by: include: The test water tank (1) has a square tube (101) welded on the outside to enhance the bearing capacity, a circular pipe (102) welded on the left side, and a sample placement groove (103) at the bottom for fixing the ecological slope protection sample; a gradient pipe device (2) is connected to the circular pipe (102) through a flange, and its cross section gradually changes from a circle to a rectangle to stabilize the water flow; a scouring cover (3) is made of transparent acrylic material and is fixed to the scouring connecting plate (104) above the sample placement groove (103) by bolts to form an observable scouring channel, and the right side of the scouring connecting plate (104) is connected to the collecting device (4) by bolts; a water storage device (5) is connected to the sample placement groove (103) by a guide The plate (105) is connected to the test water tank (1), and a drain valve (501) is provided at the bottom, and a filter baffle (6) is plugged in to filter debris; the circulating water power system includes a water pump device (8), a first valve device (7) and a second valve device (17), and a closed-loop pipeline is formed by a bend pipe device and a straight pipe device connected by flanges, and an electromagnetic flow meter (11) and a high-definition camera (12) are provided in the pipeline to monitor the flow; the scouring bearing platform device (24) is connected to the circular pipe (102) through a flange, the inclination angle can be adjusted and it is plugged in to the digital wave height device (25), and cooperates with the wave-making device (27) to simulate the scouring effect of waves on the slope protection.

2. A circulating water tank test device for simulating water flow scouring and washing slope protection according to claim 1, characterized in that: The guide plate (105) of the test water tank (1) is an arc-shaped structure, guiding the water flow to smoothly enter the water storage device (5), and the inner wall of the water storage device (5) is provided with an energy dissipation grid to eliminate the residual waves of the water flow.

3. The circulating water tank test device for simulating water flow scouring and washing slope protection according to claim 1 is characterized by: A sealing strip is provided between the scouring cover plate (3) and the scouring connection plate (104), and the scouring cover plate (3) and the scouring connection plate (104) are fixed by detachable bolts to form a scouring channel that can be quickly disassembled and assembled. The filter baffle (6) is a multi-layer stainless steel mesh structure, including a coarse filter layer and a fine filter layer, which respectively intercept debris of different particle sizes.

4. The circulating water tank test device for simulating water flow scouring and washing slope protection according to claim 1 is characterized by: The curved pipe device comprises a first curved pipe (9), a second curved pipe (14) and a third curved pipe (16); the straight pipe device comprises a first straight pipe (10), a second straight pipe (13) and a third straight pipe (15); one end of the first curved pipe (9) is connected to the water pump device (8), and the other end is connected to the first straight pipe (10); one end of the second curved pipe (14) is connected to the second straight pipe (13), and the other end is connected to the third straight pipe (15); one end of the third curved pipe (16) is connected to the third straight pipe (15), and the other end is connected to the second valve device (17).

5. The circulating water tank test device for simulating water flow scouring and washing slope protection according to claim 1 is characterized by: The water pump device (8) comprises a variable frequency motor (802) and a centrifugal pump (801), and achieves stepless flow regulation by adjusting the motor speed.

6. The circulating water tank test device for simulating water flow scouring and washing slope protection according to claim 1, characterized in that: The bottom of the brush carrying platform device (24) is provided with an angle adjustment mechanism, and the platform inclination angle can be accurately adjusted to 0°~45° through a worm gear assembly.

7. The circulating water tank test device for simulating water flow scouring and washing slope protection according to claim 1, characterized in that: The wave-making device (27) includes a programmable controller, which generates waves with a wave height range of 0.1m to 0.5m and a wavelength range of 0.5m to 2m by adjusting the frequency and amplitude of the push plate.

8. The circulating water tank test device for simulating water flow scouring and washing slope protection according to claim 1, characterized in that: The collecting device (4) is formed by welding a metal nylon wire mesh (401) and a flange (402), and has a mesh diameter of 1 mm to 5 mm, and is used for quantitatively collecting sample fragments after flushing.

9. A method for simulating water flow scouring and washing slope protection circulating water flume test device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Test preparation: Place the ecological slope protection sample in a drying oven and dry it to a constant weight, and record the initial mass; Check the sealing of the test water tank (1) to ensure that the scouring cover plate (3) and the scouring connecting plate (104) are tightly fitted through the sealing strip; Step 2: System calibration: inject clean water into the water storage device (5) to the calibrated water level, start the water pump device (8) and run it at no load for 10 minutes, calibrate the flow error through the electromagnetic flow meter (11), and adjust the frequency conversion motor (802) so that the flow fluctuation rate is less than ±2%; Step 3: Multi-gradient flow rate scouring test, adjust the opening of the first valve device (7) and the second valve device (17) to 30%~80%, set the flow rate in stages to 0.5m / s, 1.5m / s, and 3.0m / s, and each stage lasts for 30 minutes; continuously shoot the surface morphology of the slope protection with a high-definition camera (12), and collect the mass of the fragments in the collection device (4) every 5 minutes to calculate the cumulative loss rate; Step 4: Adjust the brush angle. Remove the gradient pipe device (2), connect the brush bearing platform (24) to the circular pipe (102) via a flange, use the worm gear assembly to adjust the platform tilt angle to 15°, 30°, and 45°, and use a digital level to check that the angle deviation is less than ±0.5°. Step 5: Dynamic wave parameter simulation: input the target wave height, wavelength and wave period into the programmable controller of the wave-making device (27), start the push plate to generate regular waves; monitor the wave parameters in real time through the digital wave height device (25); if the deviation exceeds 5%, automatically feedback and adjust the push plate frequency and amplitude; Step 6: Synchronous data acquisition: During the scouring test, the displacement image of the slope protection filmed by the high-definition camera (12), the mass data of the fragments from the weighing device (18), and the wave parameters from the digital wave height device (25) are synchronously recorded to generate time-displacement and time-mass loss rate curves; Step 7: Elimination and resetting of residual waves. After the test, open the drain valve (501) to drain the water, remove the washing and brushing platform (24), place the leveling water baffle (26) above the sample placement tank (103), start the water pump device (8) to flush the pipeline at 0.1m / s for 5 minutes to remove residual debris.

10. The method for simulating water flow scouring and scouring a slope protection circulating water tank test device according to claim 9, characterized in that: In step three, if the cumulative loss rate exceeds 20%, the test is terminated immediately and the critical point of slope protection failure is marked; in step five, when the wave parameters are adjusted, the push plate frequency range is 1Hz~5Hz, the amplitude range is 10cm~30cm, and after each parameter adjustment, it is allowed to run stably for 2 minutes before collecting data.

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