Underground water pollution simulation experiment device based on hydraulic driving

Abstract

The invention relates to an underground water pollution simulation experiment device based on hydraulic driving, and belongs to the technical field of underground water dynamic simulation experiments. The device comprises a simulation sand box and a data processing module, wherein the simulation sand box comprises two water supply chambers and a sand layer filling chamber between the two water supply chambers; the simulation sand box is communicated with the water flow control mechanism, the water flow control mechanism is used for providing a boundary water head for the simulation sand box, seepage detection pipe fittings and water pumping and injecting pipe fittings are distributed on the simulation sand box in an array mode, and the water pumping and injecting pipe fittings are communicated with the seepage field control mechanism. The water flow control mechanism is matched with the water supply chamber to supply water to the sand layer filling chamber, the seepage field control mechanism performs water pumping and injection on each detection point of the simulation sand box through the water pumping and injection pipe fitting, and the seepage detection pipe fitting and the data processing module perform collection, summarization and analysis on seepage pressure data and conductivity data of each detection point. And each detection point can be used for water pumping and injection, so that the detection efficiency during hydrogeological parameter inversion and pollution migration research is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of groundwater dynamic simulation experiments, and in particular relates to a groundwater pollution simulation experiment device based on hydraulic drive. Background Art

[0002] In the study of groundwater pollution, sand box simulation experiments are a common and effective research method. By building a simulated sand box in the laboratory, researchers can more intuitively understand the flow patterns of groundwater in different geological structures, and effectively simulate the migration process of pollutants in groundwater, providing data support and theoretical basis for the treatment of groundwater pollution.

[0003] The existing sand box simulation experimental devices have certain limitations in application. First, when conducting pollutant migration simulation studies, the existing devices pay little attention to the design of the pollutant extraction link, and usually do not reserve enough sampling ports, resulting in limited sampling flexibility and accuracy. Furthermore, when injecting or extracting groundwater, most devices use peristaltic pumps for water flow control. Due to the working characteristics of the peristaltic pump, the injection flow rate is fluctuating and difficult to maintain constant, affecting the reliability of the experimental data. In addition, current devices generally do not consider the discharge and collection of sewage after pollutant injection, and fail to meet the current more stringent laboratory management and environmental protection requirements. Therefore, in order to achieve higher-precision groundwater pollution simulation experiments, it is necessary to develop a groundwater pollution simulation experimental device with stable water flow drive, flexible sampling capabilities, and wastewater collection and treatment functions. Summary of the invention

[0004] The purpose of the present invention is to provide a groundwater pollution simulation experimental device based on hydraulic drive in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A groundwater pollution simulation experimental device based on hydraulic drive includes a simulation sand box, the simulation sand box includes a sand box body, water supply chambers are provided at both ends of the sand box body, and a sand layer filling chamber is provided between the two water supply chambers; the simulation sand box is connected to a water flow control mechanism, and the water flow control mechanism is connected to the two water supply chambers to provide boundary water head to the simulation sand box. Seepage detection pipe fittings are arranged in an array on one side of the sand layer filling chamber, and the seepage detection pipe fittings are used to collect sewage migration simulation data, and the sewage migration simulation data includes osmotic pressure data and conductivity data; a pumping water pipe fitting corresponding to the seepage detection pipe fitting is provided on the other side of the sand layer filling chamber; the experimental device also includes a seepage field control mechanism connected to the pumping water pipe fitting, and a dosing component for adding a tracer into the simulation sand box, and a data processing module for collecting sewage migration simulation data. In the simulation experiment preparation stage, a sand layer is filled into the sand layer filling chamber of the simulation sand box, and the seepage detection pipe fittings and the pumping water pipe fittings are respectively installed on the front and rear sides of the sand box body. During the simulation experiment, the seepage detection pipe fittings and the pumping and injection pipe fittings are first closed, and the water body to be tested is pumped into the water supply chamber of the simulated sand box through the water flow control mechanism. The water in the two water supply chambers gradually infiltrates into the sand layer filling chamber. After the water flow control mechanism inputs a sufficient amount of the water body to be tested into the water supply chamber, the seepage detection pipe fittings and the pumping and injection pipe fittings are opened, and the seepage field control mechanism pumps or injects water into the sand layer filling chamber through the pumping and injection pipe fittings. The pumping or injection operation is referred to as pumping and injection. The seepage detection pipe fittings are used to collect the osmotic pressure data of multiple detection points in the simulated sand box, and the osmotic pressure data are summarized and analyzed through the data processing module. During the pumping and injection process or after the pumping and injection, tracers are added to the water flow control mechanism through the dosing component, and the data of tracer migration are collected, summarized and analyzed through the seepage detection pipe fittings and the data processing module, so as to realize the simulation and detection of groundwater pollution and groundwater remediation.

[0007] As a further optimization scheme of the present invention, the water flow control mechanism includes a first water pump, a diversion pipe fixedly arranged at the water outlet of the first water pump, two upper water pipes respectively connected to the two water outlets of the diversion pipe, and two first water supply tanks respectively connected to the water outlets of the two upper water pipes, the first water supply tank having a drain outlet and an overflow outlet at the bottom, and a downpipe and a first overflow pipe are respectively arranged in the drain outlet and the overflow outlet of the first water supply tank, the upper end of the first overflow pipe is higher than the upper end of the downpipe, and the downpipes of the two drain outlets of the first water supply tanks are respectively connected to the two water supply chambers.

[0008] As a further optimization scheme of the present invention, the dosing component includes a dosing hopper for adding tracers into the first water supply tank, and an agitator for stirring the water inside the first water supply tank; height adjustment components are provided on both sides of the simulation sand box, and the two height adjustment components are respectively used to adjust the height of the first water supply tank to adjust the boundary water head size of the simulation sand box.

[0009] As a further optimization scheme of the present invention, the seepage detection pipe fittings include a first blind pipe and a second blind pipe respectively arranged inside and outside the sand layer filling chamber, and a connecting pipe fixedly arranged between the first blind pipe and the second blind pipe, the connecting pipe is provided with a first two-way valve and a tracer detector, and a seepage pressure sensor is provided on one side of the second blind pipe; the water extraction and injection pipe fittings include a seepage regulating pipe arranged opposite to the first blind pipe, and a second two-way valve arranged on the seepage regulating pipe.

[0010] As a further optimization scheme of the present invention, the seepage field control mechanism includes a second water pump, a first guide pipe arranged at one port of the second water pump, and a second water supply tank connected to the upper end of the first guide pipe, the second water supply tank has a guide hole and an overflow hole at the bottom, and the second water supply tank has a guide hole and an overflow hole at the bottom, in which a second guide pipe and a second overflow pipe are respectively provided, the second guide pipe is connected to a water distribution pipe at one end away from the second water supply tank, and the water distribution pipe is used to supply water or pump water to the seepage regulating pipe, a water supply and drainage pipe group is provided on the other port of the second water pump, and a water channel regulating member is provided on the second water supply tank.

[0011] As a further optimization scheme of the present invention, the water supply and drainage pipe group includes a two-way pipe connected to the second water pump, a first three-way valve with one port connected to the two-way pipe, and an inlet pipe and an outlet pipe connected to the other two ports of the first three-way valve.

[0012] As a further optimization scheme of the present invention, the water channel regulating member includes a second three-way valve and a third three-way valve, the second three-way valve and the third three-way valve both have a docking port, a pipe connection port and a suspension port, the docking ports of the second three-way valve and the third three-way valve are docked with each other, the pipe connection port of the second three-way valve is connected to the upper end of the first flow guide pipe, the pipe connection port of the third three-way valve is connected to the upper end of the second flow guide pipe, and the upper end of the second overflow pipe is higher than the suspension port of the third three-way valve.

[0013] As a further optimization solution of the present invention, a support assembly is provided on one side of the simulation sand box, and the support assembly is used to assemble the second water supply tank.

[0014] As a further optimization scheme of the present invention, the experimental device also includes a sewage collection component, which includes a collection box and a plurality of guide covers arranged on the top of the collection box, the second blind pipes are divided into a plurality of columns, and the plurality of columns of second blind pipes are respectively arranged inside a plurality of guide covers, and guide plates corresponding to the second blind pipes in the columns are arranged on the inner side of the guide covers.

[0015] As a further optimization solution of the present invention, the sewage collection assembly also includes a return water tank arranged on one side of the collection tank, and the water outlets of the second overflow pipe and the outlet pipe are both connected to the return water tank.

[0016] The beneficial effects of the present invention are:

[0017] 1) The present invention supplies water to the sand layer filling chamber through a water flow control mechanism in cooperation with a water supply chamber to simulate groundwater. The seepage field control mechanism uses a water pumping and injection pipe fitting to pump and inject water into each detection point of the simulated sand box. A tracer is added to the water flow control mechanism through a dosing component. The seepage detection pipe fitting cooperates with a data processing module to collect, summarize and analyze the osmotic pressure data and conductivity data of each detection point. Each detection point can be used for pumping and injecting water. In the process of hydrogeological parameter inversion research, it is not necessary to repeatedly disassemble and assemble sensors and related pipelines to test each point of the simulated sand box, thereby improving the detection effect and efficiency of the simulation experiment;

[0018] 2) The seepage field control mechanism of the present invention simulates the pumping-injection behavior by combining a peristaltic pump with a fixed water head with adjustable height, especially the design of the water injection link, uses overflow combined with a fixed height of the water supply tank to stabilize the injection pressure, and an agitator is set on the first water supply tank to simulate the injection behavior to provide a solution of constant concentration and improve the accuracy of the conductivity data;

[0019] 3) The present invention guides the water seeping out of the second blind pipe into the collection box through the guide plate in the guide cover. The guide plate also separates the water seeping out of the second blind pipe to prevent the water dripping from the high place from interfering with the detection result of the seepage detection pipe fitting at the low place. The pumped water is collected by the return water box. The collection box and the return water box are also used to recycle the water overflowing from the first water supply tank and the second water supply tank respectively. When the experiment involves pollutants, the waste liquid is collected to ensure that the drainage meets the specifications;

[0020] 4) The present invention regulates the water channels of the two guide pipes corresponding to the water pumping and injection operations through a water channel regulating component. During the water injection operation, the water supply and drainage pipe group is used for water supply, and the two three-way valves of the water channel regulating component are both in a state where the pipe connection port and the suspension port are connected. During the water pumping operation, the water supply and drainage pipe group is used for drainage, and the two three-way valves of the water channel regulating component directly connect the two guide pipes. While ensuring the stability of the water head during water injection, the seepage field control mechanism can be reused as a water pumping pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0023] Figure 3 It is a schematic diagram of the internal structure of the simulated sand box of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the seepage field control mechanism of the present invention;

[0025] Figure 5 yes Figure 4 The enlarged view of point B in the middle;

[0026] Figure 6 It is a structural schematic diagram of the seepage detection pipe fitting of the present invention;

[0027] Figure 7 yes Figure 6 Enlarged view of point C in the middle;

[0028] Figure 8 It is a schematic diagram of the internal structure of the first water supply tank of the present invention;

[0029] Fig. 9 It is a schematic diagram of the internal structure of the second water supply tank of the present invention.

[0030] In the figure: 1. Simulation sand box; 2. Water flow control mechanism; 3. Seepage detection pipe fittings; 4. Pumping and injection water pipe fittings; 5. Seepage field control mechanism; 6. Dosing assembly; 7. Height adjustment assembly; 8. Support assembly; 9. Sewage collection assembly; 11. Sand box body; 12. Water supply chamber; 13. Sand layer filling chamber; 14. Filter assembly; 15. Water inlet hole; 21. First water pump; 22. Diverter pipe; 23. Water supply pipe; 24. First water supply box; 25. Downpipe; 26. First overflow pipe; 31. First blind pipe; 32. Second blind pipe; 33. Connecting pipe; 34. First two-way valve; 35. Tracer detector; 36. Osmosis pressure sensor; 37, end; 41, seepage regulating tube; 42, second two-way valve; 51, second water pump; 52, first guide tube; 53, second water supply tank; 54, second guide tube; 55, second overflow pipe; 56, water distribution pipe; 57, water supply and drainage pipe group; 58, water channel regulating part; 61, dosing hopper; 62, agitator; 71, support frame; 72, assembly table; 91, collection box; 92, guide cover; 93, guide plate; 94, return water tank; 571, two-way pipe; 572, first three-way valve; 573, water inlet pipe; 574, water outlet pipe; 581, second three-way valve; 582, third three-way valve. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0032] Example

[0033] like Figure 1-3As shown, this embodiment relates to a groundwater pollution simulation experimental device based on hydraulic drive, which includes a simulation sand box 1 and a water flow control mechanism 2. The simulation sand box 1 includes a sand box body 11, and water supply chambers 12 are provided at both ends of the sand box body 11, and a sand layer filling chamber 13 is provided between the two water supply chambers 12. A filter assembly 14 is provided between the sand layer filling chamber 13 and the two water supply chambers 12. The filter assembly 14 is composed of a porous plate and a filter screen fixed on the surface of the porous plate. The filter assembly 14 is fixedly connected to the inner wall of the sand box body 11. The material of the sand box body 11 is preferably a transparent material such as tempered glass. The bottom of the two water supply chambers 12 is provided with a water inlet 15, and the water inlet 15 passes through the bottom wall of the sand box body 11. The sand box body 11 is fixed on a base, which can be a support base fixed on the experimental site or a mobile support base with a walking function. The water flow control mechanism 2 is connected to the two water supply chambers 12 through the water inlet 15 to provide a boundary water head to the simulation sand box 1. In the simulation experiment preparation stage, the sand layer and karst structure are filled into the sand layer filling chamber 13 of the simulation sand box 1, and the seepage detection pipe fittings 3 and the water extraction pipe fittings 4 are respectively installed on the front and rear sides of the sand box body 11. During the simulation experiment, the seepage detection pipe fittings 3 and the water extraction pipe fittings 4 are first closed, and the water body to be tested is pumped into the water supply chamber 12 of the simulation sand box 1 through the water flow control mechanism 2. The water bodies in the two water supply chambers 12 gradually penetrate into the sand layer filling chamber 13. After the water flow control mechanism 2 inputs a sufficient amount of the water body to be tested into the water supply chamber 12, the sewage migration simulation data is collected. After the liquid level in the water supply chamber 12 is higher than the height of each detection point, the water flow control mechanism 2 intermittently supplies water to the water supply chamber 12. When the water flow control mechanism 2 stops supplying water and the liquid level in the water supply chamber 12 no longer drops, the sewage migration simulation data collection begins.

[0034] like Figure 3As shown, the simulation sand box 1 is provided with multiple columns of detection points, and each detection point has a corresponding front plate mounting hole and a rear plate mounting hole on the sand box body 11. Seepage detection pipe fittings 3 are arranged in an array on one side of the sand layer filling chamber 13. The seepage detection pipe fittings 3 are used to collect sewage migration simulation data, and the sewage migration simulation data includes osmotic pressure data and conductivity data. On the other side of the sand layer filling chamber 13, there are water extraction and injection pipe fittings 4 corresponding to the seepage detection pipe fittings 3. The seepage detection pipe fittings 3 and the water extraction and injection pipe fittings 4 are respectively installed in the front plate mounting holes and the rear plate mounting holes of the sand box body 11. The experimental device also includes a seepage field control mechanism 5 connected to the water extraction and injection pipe fittings 4, a dosing component 6 for placing tracers into the simulation sand box 1, and a data processing module for analyzing sewage migration simulation data. During the collection of sewage migration simulation data, the seepage detection pipe fitting 3 and the pumping and injection pipe fitting 4 are opened, and the seepage field control mechanism 5 pumps or injects water into the sand layer filling chamber 13 through the pumping and injection pipe fitting 4. The pumping or injection operation is referred to as pumping and injection. The seepage pressure data of multiple detection points of the simulated sand box 1 are collected through the seepage detection pipe fitting 3, and the seepage pressure data are summarized and analyzed through the data processing module. During the pumping and injection process or after the pumping and injection is completed, a tracer is added to the water flow control mechanism 2 through the dosing component 6, and the conductivity data is collected, summarized and analyzed through the seepage detection pipe fitting 3 in cooperation with the data processing module to realize the simulation and detection of groundwater pollution and groundwater remediation.

[0035] Specifically, the water flow control mechanism 2 includes a first water pump 21, a diversion pipe 22 fixedly arranged at the water outlet of the first water pump 21, two upper water pipes 23 respectively connected to the two water outlets of the diversion pipe 22, and two first water supply tanks 24 respectively connected to the water outlets of the two upper water pipes 23. The first water supply tank 24 has a drain outlet and an overflow outlet at the bottom, and a downpipe 25 and a first overflow pipe 26 are respectively arranged in the drain outlet and the overflow outlet of the first water supply tank 24. The upper end of the first overflow pipe 26 is higher than the upper end of the downpipe 25, and the height of the upper end of the upper water pipe 23 is lower than the height of the upper end of the first overflow pipe 26, so that the first water supply tank 24 can provide a constant water head for the simulated sand box 1, and the downpipes 25 of the drain outlets of the two first water supply tanks 24 are respectively connected to the two water supply chambers 12. In the process of the water flow control mechanism 2 inputting the water body to be tested into the water supply chamber 12, the water inlet of the first water pump 21 is connected to the water body supply device to be tested. The water body to be tested can be either pure water, or sewage prepared in the laboratory or contaminated groundwater. The first water pump 21 provides the water body to be tested to the first water supply tank 24 through the shunt pipe 22 and two upper water pipes 23. The water body to be tested in the first water supply tank 24 flows into the water supply chamber 12 through the lower water pipe 25. It should be noted that the water flow in the upper water pipe 23 should be slightly greater than the water flow in the lower water pipe 25, so that the water level of the first water supply tank 24 can be stabilized at the top position of the first overflow pipe 26, and the water in the first water supply tank 24 is overflowed through the first overflow pipe 26. The water in the first water supply tank 24 is stable, which can improve the stability of the boundary water head of the simulated sand box 1.

[0036] like Figure 4-8As shown, the dosing assembly 6 includes a dosing hopper 61 for adding a tracer into the first water supply tank 24, and a stirrer 62 for stirring the water inside the first water supply tank 24. A solenoid valve is provided between the dosing hopper 61 and the water inlet of the first water supply tank 24. Both sides of the simulated sand box 1 are provided with a height adjustment assembly 7, and the two height adjustment assemblies 7 are respectively used to adjust the height of the first water supply tank 24 to adjust the boundary water head size of the simulated sand box 1. The seepage detection pipe 3 includes a first blind pipe 31 and a second blind pipe 32 respectively arranged inside and outside the sand layer filling chamber 13, and a connecting pipe 33 fixed between the first blind pipe 31 and the second blind pipe 32. The connecting pipe 33 is provided with a first two-way valve 34 and a tracer detector 35. A permeability sensor 36 is provided on one side of the second blind pipe 32. The end of the second blind pipe 32 away from the connecting pipe 33 is provided with a terminal 37. The detection end of the permeability sensor 36 is embedded in the terminal 37 to detect the water pressure of the second blind pipe 32. The water extraction and injection pipe fittings 4 include a seepage regulating pipe 41 arranged opposite to the first blind pipe 31, a filter screen is provided at one end of the seepage regulating pipe 41 facing the first blind pipe 31, and a second two-way valve 42 is provided on the seepage regulating pipe 41. The height adjustment component 7 includes a support frame 71 and an assembly table 72, a plurality of assembly holes are provided on the support frame 71, and the assembly table 72 is used to install the first water supply tank 24. By adjusting the position of the assembly table 72 on the support frame 71, the height of the first water supply tank 24 can be changed. During the simulation experiment, by adjusting the position of the assembly table 72, the heights of the two first water supply tanks 24 are made different, so that the boundary conditions on both sides of the simulated sand box 1 meet the requirements of the hydrogeological parameter inversion study. In addition, in some other embodiments, the dosing component 6 can also be arranged on the side wall of the sand box body 11, and a dosing pump for easy supply of tracers is correspondingly arranged.

[0037] When the seepage field control mechanism 5 performs water extraction and injection operation on the simulated sand box 1 through the water extraction and injection pipe 4, the water pressure of the second blind pipe 32 is detected by the seepage pressure sensor 36, and the water pressure data is summarized by the data processing module to analyze the water pressure changes at each detection point under different karst structures. In addition, when the water extraction and injection operation is not performed, the water pressure can also be detected when the first two-way valve 34 is opened. When it is necessary to detect the seepage direction of the sewage to be tested, a tracer is added to the first water supply tank 24 through the dosing hopper 61. The tracer is preferably a sodium chloride solution, and the above-mentioned tracer detector 35 is preferably a conductivity sensor. After the tracer is added, the conductivity of each detection point is detected by the conductivity sensor, the data processing module summarizes and analyzes the conductivity, and the tracer content of the detection point is judged by the conductivity, so as to analyze the seepage direction of the sewage.

[0038] The seepage field control mechanism 5 includes a second water pump 51, a first flow guide pipe 52 arranged at one port of the second water pump 51, and a second water supply tank 53 connected to the upper end of the first flow guide pipe 52, the second water supply tank 53 has a flow guide hole and an overflow hole at the bottom, and the second water supply tank 53 has a flow guide hole and an overflow hole at the bottom, and a second flow guide pipe 54 and a second overflow pipe 55 are respectively arranged in the flow guide hole and the overflow hole, and the second flow guide pipe 54 is connected to a water distribution pipe 56 at one end away from the second water supply tank 53, and the water distribution pipe 56 is used to supply water or pump water to the seepage regulating pipe 41, and the other port of the second water pump 51 is provided with a water supply and drainage pipe group 57, and the second water supply tank 53 is provided with a water channel regulating member 58. The water supply and drainage pipe group 57 includes a two-way pipe 571 connected to the second water pump 51, a first three-way valve 572 with one port connected to the two-way pipe 571, and an inlet pipe 573 and an outlet pipe 574 connected to the other two ports of the first three-way valve 572. The second water pump 51 is preferably a peristaltic pump. like Fig. 9 As shown, the water channel regulating member 58 includes a second three-way valve 581 and a third three-way valve 582, the actuators of the second three-way valve 581 and the third three-way valve 582 are fixedly mounted on the outside of the second water supply tank 53, and the valve cores of the second three-way valve 581 and the third three-way valve 582 are mounted on the inside of the second water supply tank 53, the second three-way valve 581 and the third three-way valve 582 have a docking port, a pipe connection port and a suspension port, the docking ports of the second three-way valve 581 and the third three-way valve 582 are docked with each other, the pipe connection port of the second three-way valve 581 is connected to the upper end of the first flow guide pipe 52, the pipe connection port of the third three-way valve 582 is connected to the upper end of the second flow guide pipe 54, and the upper end of the second overflow pipe 55 is higher than the suspension port of the third three-way valve 582, so that the second water supply tank 53 can provide a constant water head to the simulated sand box 1. In addition, in some other embodiments, the water channel regulating member 58 can also be a U-shaped tube fixed on the lifting device. By lifting and lowering the U-shaped tube, the water channel between the first flow guide tube 53 and the second flow guide tube 54 can also be regulated. However, the adjustment process of the U-shaped tube may cause impact on the first flow guide tube 53 and the second flow guide tube 54.

[0039] During the process of water injection operation of the seepage field control mechanism 5 on the simulated sand box 1, the first three-way valve 572 is connected to the port connected to the water inlet pipe 573 and the two-way pipe 571, and the other port is closed. The water inlet pipe 573 is connected to the water source for conveying the injected water body, the pipe connection port of the second three-way valve 581 is connected to the suspension port, and the docking port is closed. The pipe connection port of the third three-way valve 582 is connected to the suspension port, and the docking port is closed. The injected water body enters the second water supply tank 53 after passing through the second water pump 51, the first guide pipe 52 and the second three-way valve 581. A part of the injected water body in the second water supply tank 53 flows out from the second overflow pipe 55, and the other part flows into the water distribution pipe 56 along the third three-way valve 582 and the second guide pipe 54. Open the water extraction and injection pipe fittings 4 corresponding to the detection points to be tested in the simulation experiment, and the corresponding detection points can be injected with water.

[0040] During the process of the seepage field control mechanism 5 pumping water from the simulated sand box 1, the first three-way valve 572 is connected to the port connected to the two-way pipe 571 and the outlet pipe 574, and the other port is closed. The pipe connection port of the second three-way valve 581 is connected to the docking port, and the suspension port is closed. The pipe connection port of the third three-way valve 582 is connected to the docking port, and the suspension port is closed, so as to realize the direct connection between the first guide pipe 52 and the second guide pipe 54. Open the water extraction and injection pipe fittings 4 corresponding to the detection points to be tested in the simulation experiment, and the second water pump 51 can pump the water in the sand layer filling chamber 13 into the first guide pipe 52 through the water distribution pipe 56, the second guide pipe 54, the second three-way valve 581 and the third three-way valve 582, and then the water is discharged through the second water pump 51, the two-way pipe 571, the first three-way valve 572 and the outlet pipe 574. In addition, a support assembly 8 is provided on one side of the simulated sand box 1, and the support assembly 8 is used to assemble the second water supply tank 53. The structure of the support assembly 8 can be the same as that of the height adjustment assembly 7, or it can be a support structure with a fixed installation height of the second water supply tank 53, and the installation height of the second water supply tank 53 is higher than the height of the top of the water distribution pipe 56. In addition, in some other embodiments, the height adjustment assembly 7 can also be a device with lifting ability such as a hydraulic cylinder, a gas cylinder, or an electric cylinder.

[0041] Furthermore, if Figure 1 , 4As shown in Figures 6 and 7, the experimental device also includes a sewage collection component 9, which includes a collection box 91 and a plurality of flow guide covers 92 arranged on the top of the collection box 91. The second blind pipes 32 are divided into a plurality of rows, and the plurality of rows of second blind pipes 32 are respectively arranged inside the plurality of flow guide covers 92. The inner side of the flow guide covers 92 is provided with flow guide plates 93 corresponding to the second blind pipes 32 in the rows, and the ends 37 on the second blind pipes 32 are fixed on the flow guide plates 93. The sewage collection component 9 also includes a return water tank 94 arranged on one side of the collection box 91, and the outlets of the second overflow pipe 55 and the outlet pipe 574 are both connected to the return water tank 94. The water seeping out of the second blind pipe 32 is introduced into the collection box 91 through the flow guide plates 93 in the flow guide covers 92, and the water pumped out during the pumping operation is collected through the return water tank 94. In addition, the collection box 91 and the return water tank 94 are also used to recycle the overflowed water from the first water supply tank 24 and the second water supply tank 53, respectively, to avoid pollution. The guide plate 93 also separates the water seeping out of the second blind pipe 32 to prevent the water dripping from a high place from interfering with the detection result of the seepage detection pipe fitting 3 at a low place.

[0042] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A groundwater pollution simulation experimental device based on hydraulic drive, comprising a simulation sand box (1), wherein the simulation sand box (1) comprises a sand box body (11), characterized in that: Both ends of the sand box body (11) are provided with water supply chambers (12), and a sand layer filling chamber (13) is provided between the two water supply chambers (12); the simulated sand box (1) is connected to a water flow control mechanism (2), and the water flow control mechanism (2) is connected to the two water supply chambers (12) to provide a boundary water head for the simulated sand box (1); Seepage detection pipe fittings (3) are arranged in an array on one side of the sand layer filling chamber (13), and the seepage detection pipe fittings (3) are used to collect sewage migration simulation data, and the sewage migration simulation data includes osmotic pressure data and conductivity data; water extraction and injection pipe fittings (4) corresponding to the seepage detection pipe fittings (3) are arranged on the other side of the sand layer filling chamber (13); the experimental device also includes a seepage field control mechanism (5) connected to the water extraction and injection pipe fittings (4), a dosing component (6) for adding a tracer into the simulation sand box (1), and a data processing module for collecting pollutant migration data.

2. The groundwater pollution simulation experimental device according to claim 1 is characterized in that: The water flow control mechanism (2) comprises a first water pump (21), a shunt pipe (22) fixedly arranged at the water outlet of the first water pump (21), two upper water pipes (23) respectively connected to the two water outlets of the shunt pipe (22), and two first water supply boxes (24) respectively connected to the water outlets of the two upper water pipes (23); the first water supply box (24) has a drain port and an overflow port at the bottom, and a down pipe (25) and a first overflow pipe (26) are respectively arranged in the drain port and the overflow port of the first water supply box (24); the upper end of the first overflow pipe (26) is higher than the upper end of the down pipe (25); the down pipes (25) of the drain ports of the two first water supply boxes (24) are respectively connected to the two water supply chambers (12).

3. The groundwater pollution simulation experimental device according to claim 2 is characterized in that: The dosing component (6) comprises a dosing hopper (61) for adding a tracer into the first water supply tank (24), and a stirrer (62) for stirring the water inside the first water supply tank (24); height adjustment components (7) are provided on both sides of the simulation sand box (1), and the two height adjustment components (7) are respectively used to adjust the height of the first water supply tank (24) to adjust the boundary water head size of the simulation sand box (1).

4. The groundwater pollution simulation experimental device according to claim 1 is characterized in that: The seepage detection pipe fitting (3) comprises a first blind pipe (31) and a second blind pipe (32) respectively arranged inside and outside the sand layer filling chamber (13), and a connecting pipe (33) fixedly arranged between the first blind pipe (31) and the second blind pipe (32), wherein the connecting pipe (33) is provided with a first two-way valve (34) and a conductivity sensor (35), and a seepage pressure sensor (36) is provided on one side of the second blind pipe (32); the water extraction and injection pipe fitting (4) comprises a seepage regulating pipe (41) arranged opposite to the first blind pipe (31), and a second two-way valve (42) arranged on the seepage regulating pipe (41).

5. The groundwater pollution simulation experimental device according to claim 4 is characterized in that: The seepage field control mechanism (5) comprises a second water pump (51), a first flow guide pipe (52) arranged at one port of the second water pump (51), and a second water supply box (53) connected to the upper end of the first flow guide pipe (52), the second water supply box (53) having a flow guide hole and an overflow hole at the bottom, and the second water supply box (53) having a flow guide hole and an overflow hole at the bottom, in which a second flow guide pipe (54) and a second overflow pipe (55) are respectively arranged, the second flow guide pipe (54) is connected to a water distribution pipe (56) at one end away from the second water supply box (53), and the water distribution pipe (56) is used to supply water or pump water to the seepage regulating pipe (41), the other port of the second water pump (51) is provided with a water supply and drainage pipe group (57), and the second water supply box (53) is provided with a water channel regulating member (58).

6. The groundwater pollution simulation experimental device according to claim 5, characterized in that: The water supply and drainage pipe group (57) comprises a two-way pipe (571) connected to the second water pump (51), a first three-way valve (572) having one port connected to the two-way pipe (571), and an inlet pipe (573) and an outlet pipe (574) connected to the other two ports of the first three-way valve (572).

7. The groundwater pollution simulation experimental device according to claim 5, characterized in that: The water channel regulating member (58) comprises a second three-way valve (581) and a third three-way valve (582); the second three-way valve (581) and the third three-way valve (582) both have a docking port, a pipe connection port and a suspension port; the docking ports of the second three-way valve (581) and the third three-way valve (582) are docked with each other; the pipe connection port of the second three-way valve (581) is connected to the upper end of the first flow guide pipe (52); the pipe connection port of the third three-way valve (582) is connected to the upper end of the second flow guide pipe (54); and the upper end of the second overflow pipe (55) is higher than the suspension port of the third three-way valve (582).

8. The groundwater pollution simulation experimental device according to claim 5, characterized in that: A support assembly (8) is provided on one side of the simulation sand box (1), and the support assembly (8) is used to assemble a second water supply tank (53).

9. The groundwater pollution simulation experimental device according to claim 6, characterized in that: The experimental device also includes a sewage collection component (9), the sewage collection component (9) including a collection box (91) and a plurality of flow guide covers (92) arranged on the top of the collection box (91), the second blind pipes (32) are divided into a plurality of rows, the plurality of rows of second blind pipes (32) are respectively arranged inside a plurality of flow guide covers (92), and the inner side of the flow guide covers (92) is provided with flow guide plates (93) corresponding to the second blind pipes (32) in the rows.

10. The groundwater pollution simulation experimental device according to claim 9, characterized in that: The sewage collection assembly (9) further comprises a return water tank (94) arranged on one side of the collection tank (91), and the water outlets of the second overflow pipe (55) and the water outlet pipe (574) are both connected to the return water tank (94).

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