Simulation device for underneath passing of existing river channel water delivery tunnel

Abstract

The utility model relates to a simulation device for underneath passing an existing river channel water delivery tunnel, which can effectively solve the problems of simulation experiments and construction technologies for underneath passing the existing river channel through the water delivery tunnel in some water transfer projects and the like. According to the technical scheme, the simulation device for the water delivery tunnel penetrating through the Yellow River fully simulates the influence of the turbid degree of water flow in a river channel on a riverbed and the water delivery tunnel, the situation of water seepage in the river channel and under the riverbed can be conveniently simulated through a flexible material layer, and the simulated water delivery tunnel can be monitored in real time through a sensor assembly; therefore, the pressure and deformation rules of the water delivery tunnel are simulated, the rule of the influence effect of riverbed infiltration on the undercrossing water delivery tunnel project is explored, the water flow and the water level height are controlled through the valve device and the simulated dam body structure, the simulation device can simulate the actual working condition, and therefore the accuracy and practicability of the simulation result are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of river simulation, in particular to a simulation device for a water conveyance tunnel passing under an existing river. Background Art

[0002] With the construction of inter-basin water diversion project infrastructure, water transfer projects often pass under large rivers. In the process of constructing water transfer tunnel projects under riverbeds, site selection must be carried out first. At the same time, the impact of the soil structure of the lower riverbed at the current location on the underground water transfer tunnel project must be determined. At the same time, the influence mechanism of the load and permeability of the riverbed on the underground water transfer tunnel project must be experimentally studied to ensure the mutual confirmation between theoretical analysis and actual working conditions. At the same time, the use of simulation test research can effectively determine the optimal solution and predict problems that may be encountered in actual projects in advance.

[0003] In view of the above, we provide a simulation device for a water diversion tunnel under an existing river to solve the above problems. Utility Model Content

[0004] In response to the above situation, the present invention provides a simulation device for a water diversion tunnel passing under an existing river. The device can easily simulate the seepage of water from the river to the riverbed, improve the degree of freedom of simulation, and can timely understand the pressure and deformation of the simulated water diversion tunnel, so that test personnel can more accurately simulate the impact of the riverbed seepage rate on the simulated water diversion tunnel under the riverbed.

[0005] A simulation device for a water conveyance tunnel under an existing river comprises a box body and a water storage tank, wherein the water storage tank is fixedly connected to one side of the top of the box body and is provided with a diversion mechanism inside the box body, and a valve device for controlling the flow of water inside the water storage tank is provided at the bottom of the water storage tank, the box body is filled with a simulated soil layer, a simulated river channel is excavated on the upper surface of the simulated soil layer, and a flexible material layer for simulating the riverbed is laid on the simulated river channel, a simulated water conveyance tunnel is provided at the bottom of the box body, and a sensor group is provided on the outside of the simulated water conveyance tunnel A return water tank is provided on one side of the box body close to the water storage tank, and a first pumping mechanism is provided inside the return water tank, and the water outlet and water inlet of the pumping mechanism are both connected to the simulated water delivery tunnel; a second pumping mechanism is provided on the outer surface of the return water tank, and the water outlet of the second pumping mechanism is connected to the interior of the water storage tank; a return water channel is fixedly installed on one side of the box body close to the flexible material layer, and the water outlet of the return water channel is connected to the return water tank; a simulated dam structure for controlling the water level is provided at the junction of the return water channel and the end of the flexible material layer.

[0006] Preferably, both sides of the upper surface of the box are provided with bank tops for simulating river banks, and the bank tops are supported on the upper surface of the simulated soil layer. The upper surface of the simulated soil layer inside the box is a concave arc of the return channel structure and the flexible material layer is laid inside the concave arc of the upper surface of the simulated soil layer, and the material of the flexible material layer is permeable geotextile.

[0007] Preferably, the diversion mechanism includes a partition plate, a water outlet pipe and a solenoid valve. The partition plate is T-shaped and is fixedly connected to the inside of the water tank and divides the water tank into three independent cavities, and the three cavities are respectively a clear water area, a muddy water area and a pre-outlet area. The front of the partition plate corresponding to the clear water area and the muddy water area are fixedly connected to the water outlet pipe and the inside of the two water outlet pipes are installed with solenoid valves, and the water outlet ends of the two water outlet pipes are both arranged inside the pre-outlet area.

[0008] Preferably, the valve device includes a conical water outlet, a sealing baffle and an electric push rod, the conical water outlet is opened on the side of the lower surface of the water tank close to the pre-outlet area, the sealing baffle is inserted into the interior of the water tank and sealed below the conical water outlet, the fixed rod body part of the electric push rod is fixedly connected to the lower surface of the water tank and the movable rod body part is fixedly connected to the sealing baffle.

[0009] Preferably, the spray device includes a support rod, a clamping ring, a spray pipe and a spray head, the bottom end of the support rod is fixedly connected to the top of the side of the box, the clamping ring is fixedly connected to the top of the side of the support rod and the spray pipe is clamped inside the clamping ring, the spray head is fixedly installed on the side of the spray pipe and is connected to the interior of the spray pipe, the three-dimensional displacement sensor is fixedly installed on the top of the support rod and corresponds to the top of the bank on the upper surface of the box, and the spray devices and three-dimensional displacement sensors on both sides of the box are symmetrically arranged with the vertical center line of the box as the axis of symmetry.

[0010] Preferably, the sensor assembly includes a pressure sensor and a displacement sensor, and the number of the pressure sensors and displacement sensors is several, and the several pressure sensors and displacement sensors are respectively and evenly fixedly installed on the upper surface and side of the simulated water diversion tunnel and are in contact with the simulated soil layer.

[0011] Preferably, the first pumping mechanism includes a first water pump, a return water pipe and a flexible connector. Both sides of the return water tank are connected to the return water pipe and the two return water pipes are connected to the interior of the return water tank. The first water pump is arranged inside the return water tank and the pumping end is connected to one of the return water pipes. The other ends of the two return water pipes are connected to the two ends of the simulated water transfer tunnel through flexible connectors.

[0012] Preferably, the second pumping mechanism includes a second water pump, a connecting pipe, a three-way solenoid valve and a diversion pipe. The second water pump is fixedly installed on the outer side of the return water tank and its water inlet end is connected to the interior of the return water tank through a pipe. The connecting pipe is connected to the water outlet end of the second water pump and a three-way solenoid valve is fixedly installed on the top. The other two openings of the three-way solenoid valve are connected to diversion pipes, and the two diversion pipes are respectively arranged in the clear water area and the muddy water area in the water storage tank.

[0013] Preferably, the simulated dam structure includes a fixed dam body, an electric lifting rod, a lifting frame and a simulated gate. The fixed dam body is fixedly connected to the position where the return water channel is connected to the flexible material layer. Electric lifting rods are fixedly installed on both sides of the upper surface of the fixed dam body and the lifting frame is fixedly connected to the top of the movable rod body of the two electric lifting rods. The number of the simulated gates is several and the several simulated gates are equidistantly fixedly connected to the lower surface of the lifting frame and inserted into the interior of the fixed dam body.

[0014] Preferably, a stirring mechanism is provided in the muddy water area in the water tank, and the stirring mechanism includes a driving motor and a stirring rod. The stirring rod is connected to the output shaft of the driving motor through a spline and is passed through the inside of the muddy water area. The driving motor is fixedly mounted on the side of the water tank.

[0015] The beneficial effects of the above technical solution are:

[0016] The simulation device for the water diversion tunnel under the Yellow River can fully simulate the influence of the turbidity of the water flow in the river channel on the evolution of the riverbed and the influence of the water level in the river channel on the underpass water diversion tunnel through the diversion device. The flexible material layer can facilitate the simulation of river channel infiltration, and the flexible material layer can be replaced with materials of different permeability, thereby improving the simulation of different working conditions. The simulated water diversion tunnel can be monitored in real time through the sensor component, so as to timely understand the pressure and deformation of the simulated water diversion tunnel, thereby more accurately simulating the influence of the riverbed infiltration rate on the underpass water diversion tunnel under the riverbed. The flow rate and water level of the water flow in the riverbed can be controlled through the valve device and the simulated dam structure. The sprinkler device can imitate rain conditions, making the simulation device closer to the actual situation and more accurately detecting the influence of various conditions on the simulated water diversion tunnel under the riverbed, greatly improving the accuracy of the simulation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the utility model (plus the spray device);

[0018] Figure 2 This is a schematic diagram of the back structure of the utility model (with the spray device);

[0019] Figure 3 It is a cross-sectional schematic diagram of the utility model;

[0020] Figure 4 This is a schematic diagram of the electric push rod and sealing baffle of the utility model;

[0021] Figure 5 This is the intention of the stirring mechanism of the utility model;

[0022] Figure 6 This is a schematic diagram of the simulated dam structure of the utility model;

[0023] Figure 7 This is a schematic diagram of the flexible connector of the utility model (with a spray device);

[0024] Figure 8 This is a top view of the water storage tank of the utility model;

[0025] Figure 9 This is a schematic structural diagram of the utility model.

[0026] In the figure: 1. Box body; 2. Water storage tank; 3. Flexible material layer; 4. Simulated soil layer; 5. Three-dimensional displacement sensor; 6. Simulated water tunnel; 7. Return water tank; 8. Bank top; 9. Partition plate; 10. Outlet pipe; 11. Solenoid valve; 12. Conical water outlet; 13. Sealing baffle; 14. Electric push rod; 15. Support rod; 16. Clamp ring; 17. Sprinkler pipe; 18. Sprinkler head; 19. Pressure sensor; 20. Displacement sensor; 21. First water pump; 22. Return water pipe; 23. Flexible connector; 24. Second water pump; 25. Connecting pipe; 26. Three-way solenoid valve; 27. Diverter pipe; 28. Fixed dam body; 29. ​​Electric lifting rod; 30. Lifting frame; 31. Simulated gate; 32. Drive motor; 33. Agitator rod; 34. Return water channel. DETAILED DESCRIPTION

[0027] The above and other technical contents, features and effects of the present invention are described in detail below with reference to the attached Figures 1 to 8 It can be clearly presented in the detailed description of the embodiments that the structural contents mentioned in the following embodiments are all referenced to the drawings in the specification.

[0028] This embodiment provides a simulation device for a water diversion tunnel under an existing river, as shown in the attached figure. Figure 1-8As shown, it includes a box body 1 and a water tank 2. The water tank 2 is fixedly connected to one side of the top of the box body 1 and a diversion mechanism is arranged inside it. The diversion mechanism includes a partition plate 9, an outlet pipe 10 and a solenoid valve 11. The partition plate 9 is T-shaped and fixedly connected to the inside of the water tank 2 and divides the water tank 2 into three independent cavities. The three cavities are respectively a clear water area, a muddy water area and a pre-outlet area. The clear water area and the muddy water area are discharged separately, which is convenient for simulating different mud contents in different seasons; the front of the partition plate 9 corresponding to the clear water area and the muddy water area are fixedly connected to the outlet pipe 10 and the two outlet pipes 10 are installed with solenoid valves 11. The outlet ends of the two outlet pipes 10 are both arranged inside the pre-outlet area. The solenoid valve 11 can control clear water or muddy water to flow into the pre-outlet area and flow to the simulated riverbed through the valve device.

[0029] A stirring mechanism is provided in the muddy water area in the water tank 2. The stirring mechanism includes a drive motor 32 and a stirring rod 33. The stirring rod 33 is connected to the output shaft of the drive motor 32 through a spline and is passed through the inside of the muddy water area. The drive motor 32 is fixedly mounted on the side of the water tank 2. The operation of the drive motor 32 causes the stirring rod 33 to rotate, which can stir the water in the muddy water area so that the sediment inside the muddy water area is evenly mixed with the water, thereby preventing sediment accumulation from affecting the turbidity of the discharged water.

[0030] A valve device for controlling the flow of water inside the water tank 2 is provided at the bottom of the water tank 2. The valve device includes a conical water outlet 12, a sealing baffle 13 and an electric push rod 14. The conical water outlet 12 is opened on the side of the lower surface of the water tank 2 close to the pre-water outlet area. The sealing baffle 13 is inserted into the interior of the water tank 2 and blocked below the conical water outlet 12. The fixed rod body part of the electric push rod 14 is fixedly connected to the lower surface of the water tank 2 and the movable rod body part is fixedly connected to the sealing baffle 13. The tip of the conical water outlet 12 faces the side away from the electric push rod 14. The sealing baffle 13 is located at The conical water outlet 12 is located below the conical water outlet 12 and is sealed and slidably connected to the lower surface of the conical water outlet 12; in the initial position, the sealing baffle 13 extends to the end away from the electric push rod 14, completely blocking the conical water outlet 12, so that the valve device is in a closed state. When water needs to flow, the sealing baffle 13 is driven backward by the electric push rod 14. During the backward movement of the sealing baffle 13, the conical water outlet 12 is gradually opened. The gap of the conical water outlet 12 is small when it is initially opened, and the longer the distance the sealing baffle 13 moves backward, the greater the water flow rate of the conical water outlet 12.

[0031] The valve is used to discharge the water in the water tank 2 downward, so the water pressure is relatively large when the valve device is opened. In order to ensure the sealing between the sealing baffle 13 and the lower end surface of the tapered water outlet 12, a supporting structure that can be used to support the lower end surface of the sealing baffle 13 can be fixedly connected to the valve device, and the upper end surface of the supporting structure is slidably connected to the lower end surface of the sealing baffle 13. On the other hand, since the position where the valve device is opened is the lower end of the water tank 2, the water in the water tank 2 will flow downward rapidly under the action of pressure and deadweight, thereby forming a large impact force. However, the water outlet of the valve needs to guide the flow of water while preventing water from flowing. The downward impact force of the flow is large, which affects the amount of water seeping downward through the flexible material layer 3. Therefore, an anti-impact plate can be fixedly installed at the lower end of the valve below the conical water outlet 12. The anti-impact plate can play a role in resisting the impact of water flow. At the same time, the opening on the left can also guide the water flow to the simulated riverbed. When the water flows to the simulated riverbed, it will penetrate downward through the flexible material layer 3, so that the simulated soil layer 4 is in a seepage state, thereby simulating the actual situation of the stratum at the bottom of the riverbed. Then, the pressure of the simulated riverbed will be fed back to the simulated water diversion tunnel 6, and the changes in various data will be detected in real time through the sensor components on the simulated water diversion tunnel 6.

[0032] The upper surface of the box 1 is paved with a replaceable flexible material layer 3 for simulating a riverbed and is filled with a simulated soil layer 4. The simulated soil layer 4 is divided into multiple layers of fillers, and each layer of filler is used to simulate the geological structure of the river channel. This can make the test data close to the actual value, and the overall experimental device is a corresponding reduced multiple of the actual parameters. At the same time, the strength of the filler is adjusted accordingly to ensure the accuracy and authenticity of the experiment; both sides of the upper surface of the box 1 are provided with bank tops 8 for simulating river banks, and the bank tops 8 are supported on the upper surface of the simulated soil layer 4. The upper surface of the simulated soil layer 4 inside the box 1 is a concave arc simulating the river channel structure and the flexible material layer 3 is laid inside the concave arc of the upper surface of the simulated soil layer 4. The material of the flexible material layer 3 is permeable geotextile, and the geotextile can be replaced with different permeabilities to control the seepage rate.

[0033] The tops of both sides of the box body 1 are provided with a sprinkler device that can simulate rain and a three-dimensional displacement sensor 5. The sprinkler device includes a support rod 15, a clamping ring 16, a sprinkler pipe 17 and a sprinkler head 18. The bottom end of the support rod 15 is fixedly connected to the top of the side of the box body 1, the clamping ring 16 is fixedly connected to the top of the side of the support rod 15 and the sprinkler pipe 17 is clamped inside the clamping ring 16. The sprinkler head 18 is fixedly installed on the side of the sprinkler pipe 17 and is connected to the inside thereof. The three-dimensional displacement sensor 5 is fixedly installed on the top of the support rod 15. The ends of the boxes correspond to the bank top 8 on the upper surface of the box body 1. The spray devices and three-dimensional displacement sensors 5 on both sides of the box body 1 are symmetrically arranged with the vertical center line of the box body 1 as the symmetry axis. The spray pipe 17 is connected to the external water pipeline through a pipeline. After the external water pipeline injects water into the spray pipe 17, it will be sprayed out from the sprinkler head 18 onto the simulated riverbed, thereby simulating rain conditions; a blowing device can also be set above the simulated riverbed to detect the influence of wind direction and wind speed on the water flow by applying wind of different directions or different wind speeds to the water flow.

[0034] The three-dimensional displacement sensor can monitor the bank tops 8 on both sides in real time to monitor the impact of water flow changes on the bank tops. When the bank top 8 sinks or displaces, the three-dimensional displacement sensor 5 can monitor the changes in the bank top 8 in time; pressure sensors and temperature sensors can also be arranged at different parts of the simulated soil layer 4 to facilitate more detailed monitoring of changes in various parts of the simulation device.

[0035] A horizontally penetrating simulated water tunnel 6 is provided at the bottom of the box body 1, and a sensor assembly is provided on the outside of the simulated water tunnel 6. The sensor assembly includes a pressure sensor 19 and a displacement sensor 20. The number of pressure sensors 19 and displacement sensors 20 is several. Several pressure sensors 19 and displacement sensors 20 are respectively and evenly fixedly installed on the upper surface and side of the simulated water tunnel 6 and are in contact with the simulated soil layer 4. The multiple pressure sensors 19 and displacement sensors 20 on the simulated water tunnel 6 can monitor the changes of the simulated water tunnel 6 itself in real time, and the pressure of the simulated soil layer 4 will be fed back to the simulated water tunnel 6. The changes of various data can be monitored in real time through the sensor assembly on the simulated water tunnel 6.

[0036] A return water tank 7 is provided on one side of the box body 1 close to the water storage tank 2, and a first pumping mechanism is provided inside the return water tank 7, and the water outlet and water inlet ends of the pumping mechanism are both connected to the simulated water tunnel 6. The first pumping mechanism includes a first pumping pump 21, a return water pipe 22 and a flexible connector 23. Both sides of the return water tank 7 are connected with the return water pipe 22, and the two return water pipes 22 are both connected to the interior of the return water tank 7. The first pumping pump 21 is provided inside the return water tank 7 and the pumping end is connected to one of the return water pipes 22. The other ends of the two return water pipes 22 are connected to the simulated water tunnel 6 through the flexible connector 23. The two ends of the simulated water tunnel 6 are connected, and the simulated water tunnel 6 is made of a flexible material. In order to connect the simulated water tunnel 6 with the box body 1, the simulated water tunnel 6 will cause the connection part with the box body 1 to deform when it is deformed. If the connection part is a hard connection, it cannot deform. Therefore, the connection part of the simulated water tunnel 6 with the box body 1 and the return pipe 22 adopts a flexible connector 23, which is convenient for deformation connection with the box body 1, so that the simulated water tunnel 6 can deform normally as the simulation progresses, making it easier for the sensor component to monitor the changes of the simulated water tunnel 6 in real time;

[0037] Flow rate sensors can be installed on the inner bottom wall of the flexible material layer 3 and the inner wall of the simulated water transfer tunnel 6, respectively, so that the flow rate of the water body in the simulated water transfer tunnel 6 in the riverbed can be monitored in real time, and combined with the data detected by each sensor, the overall simulation situation of the simulation device can be more accurately reflected.

[0038] The outer surface of the return water tank 7 is provided with a second pumping mechanism and the water outlet end of the second pumping mechanism is connected to the interior of the water storage tank 2. The second pumping mechanism includes a second water pump 24, a connecting pipe 25, a three-way solenoid valve 26 and a diverter pipe 27. The second water pump 24 is fixedly mounted on the outer side of the return water tank 7 and its water inlet end is connected to the interior of the return water tank 7 through a pipe. The connecting pipe 25 is connected to the water outlet end of the second water pump 24 and a three-way solenoid valve 26 is fixedly mounted on the top. The other two ports of the three-way solenoid valve 26 are connected to There is a diversion pipe 27, and the two diversion pipes 27 are respectively arranged in the clear water area and the muddy water area in the water storage tank 2. The water in the return water tank 7 can be controlled by the three-way solenoid valve 26 to be pumped into the clear water area or the muddy water area. The water flows out into the simulated riverbed through the valve device. The extended end of the return water channel extends obliquely downward to create a certain slope, so that the water will be diverted into the return water tank 7 by gravity after entering the return water channel. Most of the water passing through the simulated riverbed flows into the return water tank 7 through the return water channel. The water in the return water tank 7 is The first pumping pump 21 draws out water and enters the simulated water tunnel 6 through the return pipe 22, thereby simulating the actual working conditions of the simulated water tunnel 6. The water flowing through the simulated water tunnel 6 flows back into the return tank 7 from the return pipe 22 on the other side, thus forming a cycle; the second pumping pump 24 draws the water in the return tank 7 into the water storage tank 2 through the diversion pipe 27 and then flows into the simulated riverbed through the valve device, thereby simulating the water flow conditions in the actual riverbed, and then flows into the return tank 7 through the return channel, thus forming another circulation loop; and the experimental process using seepage as a variable often takes a long time. In order to prevent more water from seeping into the simulated soil layer 4 and reducing the amount of water in the entire simulation device, which may cause the amount of water in the entire circulation loop to fail to meet the normal required amount of the cycle, the water in the return tank 7 can be appropriately added to prevent the pressure variables of the simulated soil layer 4 and the simulated water tunnel 6 from increasing due to changes in the water level flowing in the simulated riverbed, thereby affecting the accuracy of the experiment.

[0039] A return water channel is fixedly installed on one side of the box body 1 close to the flexible material layer 3, and the water outlet end of the return water channel is connected to the return water tank 7. A simulated dam structure for controlling the water level is provided at the junction of the return water channel and the end of the flexible material layer 3. The simulated dam structure includes a fixed dam body 28, an electric lifting rod 29, a lifting frame 30 and a simulated gate 31. The fixed dam body 28 is fixedly connected to the junction of the return water channel and the flexible material layer 3. Electric lifting rods 29 are fixedly installed on both sides of the upper surface of the fixed dam body 28, and the lifting frame 30 is fixedly connected to the top of the movable rod body of the two electric lifting rods 29. There are several simulated gates 31, and several simulated gates 31 are equidistantly fixedly connected to the lower surface of the lifting frame 30 and inserted into the interior of the fixed dam body 28.

[0040] The PIV technology can also be used to monitor the state of water flow. Tracer particles and tracers are added to the water body, and the sand content and flow rate of the water body are controlled to simulate different laminar flow, turbulent flow or vortex states of the water flow. The setting of the simulated dam structure can not only control the water level of the riverbed, but also cause the water flow in the riverbed to produce turbulent flow or vortex when it impacts the fixed dam body 28. Therefore, the impact of different working conditions of the water flow on the riverbed can be obtained by detecting the tracer particles.

[0041] The three-dimensional displacement sensor 5, solenoid valve 11, electric push rod 14, pressure sensor 19, displacement sensor 20, first water pump 21, second water pump 24, three-way solenoid valve 26, electric lifting rod 29 and drive motor 32 are all connected to the control unit and are electrically connected to the external circuit through wires. The data monitored by each monitoring component in the system can be remotely transmitted to the remote monitoring system through 5G technology, thereby realizing remote control.

[0042] The above description is only for the purpose of illustrating the present invention. It should be understood that the present invention is not limited to the above embodiments, and various variations that conform to the concept of the present invention are within the scope of protection of the present invention.

Claims

1. A simulation device for a water diversion tunnel under an existing river, comprising a box (1) and a water storage tank (2), characterized in that: The water storage tank (2) is fixedly connected to one side of the top of the box body (1) and is provided with a diversion mechanism inside. The bottom of the water storage tank (2) is provided with a valve device for controlling the flow of water inside the water storage tank (2). The flexible material layer is filled with a simulated soil layer inside the box body (1). A simulated river channel is excavated on the upper surface of the simulated soil layer, and a flexible material layer (3) for simulating a riverbed is laid on the simulated river channel. A horizontally penetrating simulated water delivery tunnel (6) is provided at the bottom of the box body (1), and a sensor component is provided outside the simulated water delivery tunnel (6). The box body (1) is provided with a sensor component on one side close to the water storage tank (2). A return water tank (7) is provided, and a first pumping mechanism is provided inside the return water tank (7), and both the water outlet and water inlet of the pumping mechanism are in communication with a simulated water delivery tunnel (6); a second pumping mechanism is provided on the outer surface of the return water tank (7), and the water outlet of the second pumping mechanism is in communication with the interior of the water storage tank (2); a return water channel (34) is fixedly installed on one side of the box body (1) close to the flexible material layer (3), and the water outlet of the return water channel (34) is in communication with the return water tank (7); and a simulated dam structure for controlling the water level is provided at the junction of the return water channel (34) and the end of the flexible material layer (3).

2. The simulation device for a water diversion tunnel under an existing river according to claim 1, characterized in that: Both sides of the upper surface of the box (1) are provided with bank tops (8) for simulating river banks, and the bank tops (8) are supported on the upper surface of the simulated soil layer (4). The upper surface of the simulated soil layer (4) inside the box (1) is a concave arc, and the flexible material layer (3) is laid inside the concave arc of the upper surface of the simulated soil layer (4). The material of the flexible material layer (3) is a permeable geotextile.

3. The simulation device for a water diversion tunnel under an existing river according to claim 1, characterized in that: The diversion mechanism comprises a partition plate (9), a water outlet pipe (10) and a solenoid valve (11); the partition plate (9) is T-shaped and fixedly connected to the interior of the water storage tank (2) and divides the interior of the water storage tank (2) into three independent cavities, wherein the three cavities are respectively a clear water area, a muddy water area and a pre-water outlet area; the front portion of the partition plate (9) corresponding to the clear water area and the muddy water area is fixedly connected to the water outlet pipe (10), and the interior of the two water outlet pipes (10) is installed with a solenoid valve (11); the water outlet ends of the two water outlet pipes (10) are both arranged inside the pre-water outlet area.

4. The simulation device for a water diversion tunnel under an existing river according to claim 3, characterized in that: The valve device comprises a conical water outlet (12), a sealing baffle (13) and an electric push rod (14); the conical water outlet (12) is provided on a side of the lower surface of the water storage tank (2) close to the pre-water outlet area; the sealing baffle (13) is inserted into the interior of the water storage tank (2) and seals below the conical water outlet (12); the fixed rod portion of the electric push rod (14) is fixedly connected to the lower surface of the water storage tank (2) and the movable rod portion is fixedly connected to the sealing baffle (13).

5. The simulation device for a water diversion tunnel under an existing river according to claim 1, characterized in that: The sensor assembly comprises a pressure sensor (19) and a displacement sensor (20), wherein the number of the pressure sensor (19) and the displacement sensor (20) are both several, and the several pressure sensors (19) and the displacement sensors (20) are respectively and evenly fixedly installed at equal distances on the upper surface and side surfaces of the simulated water conveyance tunnel (6) and are all in contact with the simulated soil layer (4).

6. The simulation device for a water diversion tunnel under an existing river according to claim 1, characterized in that: The first pumping mechanism comprises a first pumping pump (21), a return water pipe (22) and a flexible connector (23); both sides of the return water tank (7) are connected to the return water pipe (22), and both return water pipes (22) are connected to the interior of the return water tank (7); the first pumping pump (21) is arranged inside the return water tank (7), and the pumping end is connected to one of the return water pipes (22); the other ends of the two return water pipes (22) are connected to both ends of the simulated water delivery tunnel (6) through the flexible connector (23).

7. The simulation device for a water diversion tunnel under an existing river according to claim 3, characterized in that: The second water pumping mechanism comprises a second water pump (24), a connecting pipe (25), a three-way electromagnetic valve (26) and a diversion pipe (27). The second water pump (24) is fixedly mounted on the outer side of the return water tank (7) and its water inlet is connected to the interior of the return water tank (7) through a pipe. The connecting pipe (25) is connected to the water outlet of the second water pump (24) and a three-way electromagnetic valve (26) is fixedly mounted on the top. The other two openings of the three-way electromagnetic valve (26) are both connected to the diversion pipe (27). The two diversion pipes (27) are respectively arranged in the clear water area and the muddy water area in the water storage tank (2).

8. The simulation device for a water diversion tunnel under an existing river according to claim 1, characterized in that: The simulated dam structure comprises a fixed dam body (28), an electric lifting rod (29), a lifting frame (30) and a simulated gate (31); the fixed dam body (28) is fixedly connected to the portion where the return water channel and the flexible material layer (3) are connected; the electric lifting rods (29) are fixedly installed on both sides of the upper surface of the fixed dam body (28); and the lifting frame (30) is fixedly connected to the top ends of the movable rods of the two electric lifting rods (29); and the number of the simulated gates (31) is several, and the several simulated gates (31) are fixedly connected to the lower surface of the lifting frame (30) at equal distances and inserted into the interior of the fixed dam body (28).

9. The simulation device for a water diversion tunnel under an existing river according to claim 3, characterized in that: A stirring mechanism is provided in the muddy water area in the water storage tank (2), the stirring mechanism comprising a driving motor (32) and a stirring rod (33), the stirring rod (33) being connected to the output shaft of the driving motor (32) via a spline and passing through the interior of the muddy water area, and the driving motor (32) being fixedly mounted on the side of the water storage tank (2).

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