A large-scale experimental device for regulating groundwater depth and its usage method

Abstract

The present invention relates to the technical field of pit injection tests, and provides a large-scale groundwater depth regulation experimental device and a method for using the same. It includes: a test pit, in which a liquid level observation well is arranged, and a liquid level sensor Y1 is arranged in the liquid level observation well; a water supply and drainage pipe network is arranged at the bottom of the test pit, and the water supply and drainage pipe network passes through the lower part of the test pit and is connected to a liquid level column through a first water pipe. A liquid level sensor Y2 is arranged between the water supply and drainage pipe network and a booster pump, and the liquid level column is connected with a liquid level sensor Y3. The beneficial effects are as follows: during the water injection process, the liquid level sensor Y2 monitors the change of the water supply pressure inside the test water supply system at any time. When the pressure reaches a certain threshold of the set index, the water supply is stopped, and the water that has entered the inside of the side pit diffuses slowly under a certain pressure. Then, the water supply is repeated according to the required number of water supply times until the water level in the test pit reaches the preset water level, which speeds up the flow rate of water in the soil of the test pit and improves the water supply rate.

Description

Technical Field

[0001] The present invention relates to the technical field of pit water injection tests, and particularly relates to a large-scale groundwater depth regulation experimental device and a method for using the same. Background Art

[0002] In the actual water supply process of rising groundwater levels, due to the limitations of the water pressure difference and the flow path of soil voids, the self-flow water supply speed is too slow to meet the requirements of actual simulation experiments; the water pressure difference refers to the pressure difference between the liquid level column and the pit. In an ideal situation without soil, the water levels in the liquid level column and the pit are the same, but in reality, the water flows upward through the soil gaps in the pit due to the pressure difference. However, due to the small pressure difference, the water flow is relatively slow in the soil of the pit, reducing the water supply rate. In addition, if the pressure difference is increased by external means, during the pressurized water supply process, if the water supply pressure is too high, and there are small voids between the soil in the upper pit and the pit wall locally, the water pressure will be released along the voids, resulting in the problem of local water gushing from the wall flow, making it difficult to ensure a relatively uniform rise in the groundwater level inside the side pit.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a large-scale groundwater depth regulation experimental device and a method for using the same to solve the technical problems existing in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a large-scale groundwater depth regulation experimental device, including: a pit, a liquid level observation well is arranged in the pit, and a liquid level sensor Y1 is arranged in the liquid level observation well; a water supply and drainage pipe network is arranged at the bottom of the pit, the water supply and drainage pipe network passes through the lower part of the pit and is connected to a liquid level column through a first water pipe, and the liquid level column is connected to a water source through a second water pipe; a three-way valve is arranged at one end of the first water pipe close to the liquid level column, and a water supply valve is arranged on the second water pipe; a booster pump is arranged at one end of the first water pipe close to the water supply and drainage pipe network, a liquid level sensor Y2 is arranged between the water supply and drainage pipe network and the booster pump, and a liquid level sensor Y3 is connected to the liquid level column.

[0006] In an optional embodiment, the liquid level sensor Y1 is electrically connected to a second collector, the liquid level sensor Y2 is electrically connected to a first collector, and the liquid level sensor Y3 is electrically connected to a third collector.

[0007] In an optional embodiment, the booster pump is electrically connected to a frequency converter, and the frequency converter is connected to a power supply.

[0008] In an optional embodiment, the first collector, the second collector, the third collector and the frequency converter are all connected to a control center.

[0009] In an alternative embodiment, the three-way valve is a drainage electric three-way valve, and the water supply valve is a water supply electric valve; the drainage electric three-way valve and the water supply electric valve are electrically connected to a controller, and the controller is connected to the control center.

[0010] In an alternative embodiment, the water supply and drainage pipe network extends outside the test pit and is connected to a ball valve.

[0011] In an alternative embodiment, multiple water supply pipes of the water supply and drainage pipe network are arranged in parallel, and multiple water injection holes are provided on each water supply pipe.

[0012] In an alternative embodiment, gravel is provided on the periphery of the water supply and drainage pipe network, and soil is on the gravel.

[0013] On the other hand, Embodiment 9 of the present invention further provides a method for using the large-scale groundwater depth regulation experimental device as described above, including the following steps:

[0014] S1: Detect the water level h1 in the test pit through the liquid level sensor Y1 in the liquid level observation well, and compare it with the preset water level h0;

[0015] S2: When the water level h1 in the test pit is equal to the preset water level h0, no water injection is carried out; when the water level h1 in the test pit is less than the preset water level h0, calculate the required water injection volume and calculate and determine the required number of water injection times;

[0016] S3: Start the booster pump to start water injection. Until the number of water injection times is reached, after each water injection, the next water injection is carried out after a certain time interval. The pressure of each water injection is less than the threshold value and is monitored by the liquid level sensor Y2;

[0017] S4: After the required number of water injection times is completed, the water level h1 in the test pit is equal to the preset water level h0, and the booster pump stops water injection;

[0018] S5: Collect the water level h1 in the test pit again after a certain time. When the water level h1 in the test pit is less than the preset water level h0 again, repeat the above steps.

[0019] In an alternative embodiment, in step S2, the calculation method for the required number of water injection times n is:

[0020] The preset water level is h0, the current water level is h1, and water injection is required when h0>h1; the cross-sectional area of each side pit is sm 2 , the porosity of the soil is θ, and the water injection volume is s*(h0 - h1)*θ / 100;

[0021] The water injection volume injected by each start of the water injection pump is qm 3 , then the number of water injection times is INT represents taking the integer part of the settlement result of ...

[0022] The beneficial effects of the present invention are as follows:

[0023] The present invention provides a pressure control system. The booster pump provides pressure output, and the liquid level sensor Y2 monitors and controls the water pressure. During the water injection process, the liquid level sensor Y2 monitors the change of the water supply pressure inside the test water supply system (especially the lower part) at any time. When the pressure reaches a certain threshold of the set index, the water supply stops, allowing the water that has entered the side pit to slowly diffuse under a certain pressure, and then repeating the water supply according to the required number of water supply times until the preset water level in the test pit is reached. Through the control of the booster pump and the pressure it provides, the flow rate of water in the soil of the test pit is accelerated, and the water supply rate is increased.

[0024] In addition, during the process of supplying water to the soil of the test pit, the pressure data provided by the booster pump is always within the threshold range. After one water injection is completed and the water supply stops, the water will slowly diffuse, so that the pressure inside the groundwater depth will be released, avoiding the situation of water emerging from local areas, especially avoiding water emerging from between the soil and the side wall of the test pit. The present invention can also accurately calculate the number of water injections. In particular, by introducing the porosity of the soil as θ, the number of water injections can be further accurately controlled to ensure the accurate and efficient completion of water injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 FIG. is a schematic diagram of the water supply process of a large-scale groundwater depth regulation experimental device provided in an embodiment of the present invention;

[0027] Figure 2 FIG. is a schematic structural diagram of a large-scale groundwater depth regulation experimental device provided in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the following further details the present invention with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The orientations or positions indicated by the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positions shown in the drawings, and are only for convenience of description and should not be construed as a limitation on the technical solution of the present invention. The terms "first" and "second" are only used for convenience of description and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. The meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0030] Embodiment 1

[0031] Please refer to the attached Figure 1-2 , the purpose of this embodiment is to provide a large-scale experimental device for regulating the groundwater depth, including: a test pit, a liquid level observation well is arranged in the test pit, and a liquid level sensor Y1 is arranged in the liquid level observation well to detect the water level height in the test pit through the liquid level sensor Y1 in the liquid level observation well; a water supply and drainage pipe network is arranged at the bottom of the test pit. In this embodiment, a plurality of water supply pipes of the water supply and drainage pipe network are arranged in parallel, and a plurality of water injection holes are arranged on each water supply pipe. Gravel is arranged on the periphery of the water supply and drainage pipe network, and soil is on the gravel. The water flows through the gravel and into the soil under the action of pressure. It should be noted that the water supply and drainage pipe network extends outside the test pit and is connected to a ball valve. When the water supply is excessive or the water level in the test pit is higher than the preset water level due to weather reasons such as rainfall, the ball valve can be opened to discharge the excess water.

[0032] Specifically, the water supply and drainage pipe network passes through the lower part of the test pit and is connected to a liquid level column through a first water pipe, and the liquid level column is connected to a water source through a second water pipe; a three-way valve is arranged at one end of the first water pipe close to the liquid level column, and a water supply valve is arranged on the second water pipe. Preferably, the three-way valve is a drainage electric three-way valve, and the water supply valve is a water supply electric valve; the drainage electric three-way valve and the water supply electric valve are electrically connected to a controller, and the controller is connected to the control center. Under the control of the control center, the water supply electric valve can be opened, the water source enters the liquid level column through the second water pipe, the water in the liquid level column enters the water supply and drainage pipe network through the first water pipe, and then enters the soil in the test pit through the gravel.

[0033] Further, a booster pump is provided at one end of the first water pipe close to the water supply and drainage network. A liquid level sensor Y2 is provided between the water supply and drainage network and the booster pump. The liquid level column is connected with a liquid level sensor Y3. It is worth mentioning that the booster pump provides pressure output, and the liquid level sensor Y2 monitors and controls the water pressure. During the water injection process, the liquid level sensor Y2 monitors the change of the water supply pressure inside the water supply system (especially the lower part) at any time. During the water supply process, the pressure data provided by the booster pump is always within the threshold range. After a water injection is completed, the water supply stops, and the water that has entered the side pit slowly diffuses under a certain pressure. Then, the water supply is repeated according to the required number of water supply times until the preset water level in the measuring pit is reached. Through the control of the booster pump and the pressure it provides, the flow rate of water in the soil of the measuring pit is accelerated, and the water supply rate is increased.

[0034] In addition, the liquid level sensor Y1 is electrically connected to the second collector, the liquid level sensor Y2 is electrically connected to the first collector, and the liquid level sensor Y3 is electrically connected to the third collector. The booster pump is electrically connected to the frequency converter, and the frequency converter is connected to the power supply. The first collector, the second collector, the third collector, and the frequency converter are all connected to the control center. Under the control of the control center, the first collector, the second collector, and the third collector respectively collect the data of the liquid level sensor Y2, the liquid level sensor Y1, and the liquid level sensor Y3, output the pressure value and the water level value, and control and change the pressure output of the booster pump through the frequency converter. During the process of supplying water to the soil of the measuring pit, although the pressure provided by the booster pump is large, the water supply stops after the pressure reaches the threshold value, and the water flow will slowly diffuse, so that the pressure inside the groundwater depth will be released, avoiding the situation of water emerging from a local area, especially avoiding the water flow emerging between the soil and the side wall of the measuring pit.

[0035] Embodiment 2

[0036] Please refer to the attached Figure 1-2 , the purpose of this embodiment is to provide a usage method of a large-scale groundwater depth regulation experimental device, including the following steps:

[0037] S1: Detect the water level h1 in the measuring pit through the liquid level sensor Y1 in the liquid level observation well and compare it with the preset water level h0; specifically, the second collector collects the water level data of the liquid level sensor Y1 and transmits it to the control center;

[0038] S2: When the water level h1 in the measuring pit is equal to the preset water level h0, no water injection is carried out; when the water level h1 in the measuring pit is less than the preset water level h0, calculate the required water injection volume and calculate and determine the required number of water injection times, and complete the calculation in the control center;

[0039] The calculation method of the required number of water injection times n is:

[0040] The preset water level is h0, and the current water level is h1. When h0 > h1, water injection is required; the cross-sectional area of each side pit is sm 2 , the porosity of the soil is θ, and the water injection volume is s*(h0 - h1)*θ / 100;

[0041] The water injection volume per start of the water injection pump is qm 3 , then the number of water injection times is INT means taking the integer part of the settlement result.

[0042] S3: Start the booster pump to start water injection until the number of water injection times is reached. After each water injection, the next water injection is carried out after a certain time interval. The pressure of each water injection is less than the threshold value and is monitored by the liquid level sensor Y2; The first collector collects the liquid level data and pressure data of the liquid level sensor Y2 and transmits them to the control center. During the water supply process, the pressure data provided by the booster pump is always within the threshold range. After completing one water injection, the water supply is stopped, and after a certain time interval, during which the water flow will slowly spread, the pressure inside the groundwater depth will be released, avoiding the situation of water emerging from local areas, especially avoiding the water flow emerging between the soil and the side wall of the measuring pit. When injecting water, the water source first enters the liquid level column and then enters the soil under the action of the booster pump.

[0043] S4: After completing the required number of water injection times, the water level h1 in the measuring pit is equal to the preset water level h0, and the booster pump stops water injection;

[0044] S5: After a certain time, collect the water level h1 in the measuring pit again. When the water level h1 in the measuring pit is less than the preset water level h0 again, it may be due to the evaporation of the water flow caused by hot weather, resulting in the reduction of the liquid level in the measuring pit, and then repeat the above steps.

[0045] In this embodiment, a booster pump is added to pressurize and forcibly supply water into the measuring pit, increasing the water supply rate. The water supply rate is controlled according to parameters such as the water demand of the measuring pit and the actual test conditions of the simulated groundwater depth. During the process of adjusting the groundwater level, the water supply and drainage operations are key actions. The normal operation of its electronic system is also one of the key issues. All the power-consuming units such as the system control unit, sensors, collectors, booster pumps, and solenoid valves are within the same set of power supply systems. The system monitors the power supply status of the commercial power. In case of a power outage of the commercial power, the system automatically stops working, closes the water supply and drainage system, collects and saves a set of parameters of each sensor, closes all solenoid valves, and the system automatically shuts down. After the commercial power supply is restored, the system is manually started. The system resumes operation. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. Method for using a large-scale experimental device for regulating groundwater depth, comprising: A test pit, in which a liquid level observation well is arranged, and a liquid level sensor Y1 is arranged in the liquid level observation well; a water supply and drainage pipe network is arranged at the bottom of the test pit, and the water supply and drainage pipe network passes through the lower part of the test pit and is connected to a liquid level column through a first water pipe, and the liquid level column is connected to a water source through a second water pipe; a three-way valve is arranged at one end of the first water pipe close to the liquid level column, and a water supply valve is arranged on the second water pipe; a booster pump is arranged at one end of the first water pipe close to the water supply and drainage pipe network, a liquid level sensor Y2 is arranged between the water supply and drainage pipe network and the booster pump, and a liquid level sensor Y3 is connected to the liquid level column; The use is carried out according to the following steps: S1: Detect the water level h1 in the test pit through the liquid level sensor Y1 in the liquid level observation well and compare it with the preset water level h0; S2: When the water level h1 in the test pit is equal to the preset water level h0, no water injection is carried out; when the water level h1 in the test pit is less than the preset water level h0, calculate the required water injection volume and calculate and determine the required number of water injection times; The calculation method for the required number of water injection times n is: The preset water level is h0, and the current water level is h1. When h0 > h1, water injection is required; the cross-sectional area of each side pit is sm 2 , the porosity of the soil is θ, and the water injection volume is s*(h0 - h1)*θ / 100; The water injection volume per start of the water injection pump is qm 3 , then the number of water injection times is INT represents taking the integer part of the settlement result of ; S3: Start the booster pump to start water injection until the number of water injection times is reached. After each water injection, the next water injection is carried out after a certain time interval, and the pressure of each water injection is less than the threshold value and is monitored by the liquid level sensor Y2; S4: After the required number of water injection times is completed, the water level h1 in the test pit is equal to the preset water level h0, and the booster pump stops water injection; S5: Collect the water level h1 in the test pit again after a certain time. When the water level h1 in the test pit is less than the preset water level h0 again, repeat the above steps.

2. The use method according to claim 1, characterized in that, The liquid level sensor Y1 is electrically connected to the second collector, the liquid level sensor Y2 is electrically connected to the first collector, and the liquid level sensor Y3 is electrically connected to the third collector.

3. The use method according to claim 2, characterized in that, The booster pump is electrically connected to an inverter, and the inverter is connected to a power supply.

4. The use method according to claim 3, characterized in that, The first collector, the second collector, the third collector and the inverter are all connected to a control center.

5. The use method according to claim 4, characterized in that, The three-way valve is a drainage electric three-way valve, and the water supply valve is a water supply electric valve; the drainage electric three-way valve and the water supply electric valve are electrically connected to a controller, and the controller is connected to the control center.

6. The use method according to claim 1, characterized in that, The water supply and drainage pipe network extends outside the test pit and is connected to a ball valve.

7. The use method according to claim 1, characterized in that, Multiple water supply pipes of the water supply and drainage pipe network are arranged in parallel, and multiple water injection holes are arranged on each water supply pipe.

8. The use method according to claim 1, characterized in that, Crushed stones are arranged on the periphery of the water supply and drainage pipe network, and soil is on the crushed stones.

Images