CN202486127U - Confined Aquifer Test Simulator - Google Patents

Abstract

The utility model provides an analog device for a confined aquifer test. The analog device for the confined aquifer test comprises a sandy soil container, a water inflow height control device, a water supply device and a piezometer observation device. One end of the obliquely placed sandy soil container is provided with a first water inflow pipe, a plurality of piezometer mouths are evenly distributed on a front side wall, a back side wall and the bottom face of the sandy soil container, the piezometer mouths are connected with one piezometer tube of the piezometer observation device through a connecting pipe, a water pumping pipe is arranged on the bottom of the sandy soil container, a water discharge case is fixed outside a side wall at one lower end of the sandy soil container, and the top of the sandy soil container is connected with a pressure-bearing top cap which is provided with at least one overflow pipe. The water inflow height control device comprises a water tank which is connected with a lifting device, and the piezometer observation device comprises a piezometer plate and a plurality of the piezometer tubes arranged side by side on the piezometer plate. The analog device for the confined aquifer test can simulate change characteristics of a three-dimensional flow field of the confined aquifer on natural conditions and mining conditions, and is simple in structure and low in cost.

Description

Confined Aquifer Test Simulator

technical field

The utility model relates to a test device, in particular to a pressurized aquifer test simulation device.

Background technique

In groundwater science and research, the understanding and research of confined aquifers are generally carried out through field experiments. However, field experiments are generally expensive, poorly intuitive, and it is difficult to study the groundwater flow of confined aquifers under different external conditions. Therefore, the development of a confined aquifer test device to simulate the movement characteristics of groundwater under different recharge, runoff and discharge conditions is of great importance for the study of the movement law of groundwater flow in porous media under confined conditions. Practical significance.

Utility model content

The purpose of the utility model is to provide a pressurized aquifer test simulation device, which has simple structure, low price and more intuitive test process.

In order to achieve the above object, the technical solution of the utility model is: a test simulation device for a confined aquifer, including a sand container, a water inlet height control device, a water supply device, a pressure measurement and observation device, the sand container is placed obliquely, the sand container The top of the side wall at the higher end of the soil container is provided with a first water inlet pipe, and a switch is provided on the first water inlet pipe. Several pressure measuring nozzles are evenly distributed on the front, rear side walls and bottom of the sand container, and the pressure measuring nozzles are tubular. , the pressure measuring nozzle is located on the inner part of the sand container, and a screen hole is provided on the pipe wall. Each pressure measuring nozzle is connected to a pressure measuring tube of the pressure measuring observation device through a connecting pipe. The part of the water pipe and the suction pipe located inside the sand container is provided with a screen hole, the part of the suction pipe located outside the sand container is provided with a control valve and a flow meter, and a drainage box is fixed outside the side wall of the lower end of the sand container to drain water There is a second return pipe at the bottom of the tank, and a control valve and a flow meter are provided on the second return pipe. A water outlet hole is provided on the side wall between the sand container and the drainage tank. The top of the sand container is detachably connected with a pressure-bearing roof. Cover, the pressure-bearing top cover is provided with at least one overflow pipe, the part of the overflow pipe located inside the sand container is provided with a screen hole, the part of the overflow pipe located outside the sand container is provided with a switch, and the water inlet height control device includes The water tank, the lifting device, the water tank is connected with the lifting device, the water tank is divided into a water supply tank and an overflow tank by an overflow plate, the other end of the first water inlet pipe is arranged at the bottom of the water supply tank, and a third water inlet pipe is also provided on the side wall of the water supply tank, The third water inlet pipe is connected with a water supply device, and the bottom of the overflow tank is provided with a third water return pipe.

The utility model pressurized aquifer test simulation device, wherein, the water supply device includes a water tank and a water pump arranged in the water tank, the water tank is provided with a fourth water inlet pipe, the fourth water inlet pipe is provided with a switch, and the water outlet of the water pump is connected to the water pump. The third water inlet pipes are connected with each other, and the other end of the third water return pipe is arranged in the water tank.

The pressurized aquifer test simulation device of the utility model, wherein, the pumping pipe is connected with a first return pipe, and the first return pipe communicates with the water tank of the water supply device.

The pressurized aquifer test simulation device of the utility model, wherein, the second return pipe communicates with the water tank of the water supply device.

The pressure-bearing aquifer test simulation device of the utility model, wherein, the included angle between the bottom surface of the sand container and the horizontal plane is 20-30°.

The utility model relates to a pressurized aquifer test simulation device, wherein, the sieve hole on the pressure measuring nozzle is wrapped with a wire mesh.

The utility model relates to a pressurized aquifer test simulation device, wherein, the screen hole of the water pumping pipe is wrapped with a wire mesh.

The utility model relates to a pressurized aquifer test simulation device, wherein, the screen hole on the overflow pipe is wrapped with a wire mesh.

The utility model is a pressurized aquifer test simulation device, wherein, a silk screen is arranged on the inner side of the side wall between the sand container and the drainage box.

The utility model pressurized aquifer test simulation device, wherein the pressure measurement observation device includes a pressure measurement plate and several pressure measurement tubes arranged side by side on the pressure measurement plate, and the lifting device is a fixed pulley block.

After adopting the above scheme, because the utility model pressurized aquifer test simulation device comprises a sandy soil container, a water inlet height control device, a water supply device, and a pressure measurement observation device, the bottom of the sandy soil container is provided with a suction pipe for simulating a pumping well, There is a drainage box at one end of the sand container, and a return pipe on the drainage box, which can simulate a spring flow. An overflow pipe is provided on the pressure-bearing top cover to simulate an artesian well. Therefore, this device can simulate the pressure under natural conditions and mining conditions. The change characteristics of the three-dimensional flow field of the aquifer, and the test process is intuitive, the structure is simple, and the price is low.

In addition, since the first, second, and third water return pipes are all connected to the water tank of the water supply device, the water flowing out of each water return pipe during the test can be recovered, which is more economical. Each sieve hole is wrapped with wire mesh, which can prevent sand and soil from entering each return pipe during the test, which will affect the accuracy of the test.

Description of drawings

Fig. 1 is the structural diagram of the utility model confined aquifer test simulation device;

Fig. 2 is a perspective view of the sand and soil container in the confined aquifer test simulation device of the utility model.

The following is a concrete description of the utility model confined aquifer test simulation device in conjunction with the accompanying drawings.

Detailed ways

As shown in FIG. 1 , the test simulation device for a confined aquifer of the present invention includes a sand container 1 , a water inflow height control device 2 , a water supply device 3 , and a pressure measurement and observation device 4 .

The sand container 1 is placed obliquely. The left side of the sand container 1 is higher and the right side is lower. The angle between the bottom surface of the sand container 1 and the horizontal plane is 20-30°. The water pipe 12, the other end of the first water inlet pipe 12 is arranged at the bottom of the water supply tank 210, the first water inlet pipe 12 is provided with a switch, and a plurality of pressure measuring nozzles 13 are evenly distributed on the front and rear side walls and the bottom surface of the sand container 1. The pressure nozzle 13 is tubular, and the pressure measurement nozzle 13 is located on the inner part of the sand container 1. A screen hole is arranged on the pipe wall, and the screen hole is wrapped with a silk screen. The pressure measuring tube 42 is connected, and the center of the bottom of the sand container 1 is also provided with a suction pipe 15. The part of the suction pipe 15 located inside the sand container 1 is provided with a screen hole, and the screen hole is wrapped with a silk screen. The water suction pipe 15 passes through the first The return pipe 5 is connected to the water tank 31 of the water supply device 3, the first return pipe 5 is provided with a control valve and a flow meter, the right side wall of the sand container 1 is fixed with a drainage box 6, and the bottom of the drainage box 6 is provided with a second return pipe 61, the second return pipe 61 communicates with the water tank 31 of the water supply device 3, the second return pipe 61 is provided with a control valve and a flow meter, and the side wall between the sand container 1 and the drainage tank 6 is evenly distributed with water outlets 62 , the inner side of the side wall is provided with a wire mesh 63, as shown in Figure 2, the top of the sand container 1 is detachably connected with a pressure-bearing top cover 16 by a plurality of screws, and a pressure-bearing top cover 16 is provided between the sand container 1 and the pressure-bearing top cover 16. Rubber sealing gasket 17, three overflow pipes 18 are arranged at intervals on the pressure-bearing top cover 16, and the overflow pipe 18 is provided with a sieve hole inside the sand container 1, and the sieve hole is wrapped with a silk screen, and the overflow pipe 18 is located in the sand container 1. The external part of the sand container 1 is provided with a switch;

The water inlet height control device 2 comprises a water tank 21 and a lifting device 22. The water tank 21 is divided into a water supply tank 210 and an overflow tank 211 by an overflow plate. The lifting device 22 is a fixed pulley block, and the lifting cable 213 on the water tank 21 is wound on the fixed pulley. The height of the water tank 21 is controlled by the lifting device 22. The water supply tank 210 is provided with a third water inlet pipe 212, and the bottom of the overflow tank 211 is provided with a third water return pipe 213. The other ends of the third water inlet pipe 212 and the third water return pipe 213 are Set in the water tank 31.

The water supply device 3 includes a water tank 31, a water pump 32 is arranged in the water tank 31, a fourth water inlet pipe 33 is arranged on the water tank 31, a switch is arranged on the fourth water inlet pipe 33, and the water outlet of the water pump 32 is connected with the third water inlet pipe 212 .

The pressure measurement and observation device 4 includes a pressure measurement plate 41 and a plurality of pressure measurement tubes 42 , and the plurality of pressure measurement tubes 42 are fixed side by side on the pressure measurement plate 41 .

Preparations before the experiment: close all switches and control valves, open the pressure-bearing top cover 17 of the sand container 1, fill the sand container 1 with sand and soil water-containing medium, sand simulates an aquifer, clay simulates an aquifer, and sand fills After loading, the pressure-bearing top cover 17 is covered, and a rubber sealing gasket 17 is placed between the pressure-bearing top cover 17 and the sand container 1, and the pressure-bearing top cover 17 and the sand container 1 are fixed mutually with screws. Open the switch on the fourth water inlet pipe 33 of the water supply device 3, supply water to the water supply device 3, close the switch after the water volume is sufficient, open the switch on the first water inlet pipe 12 on the left side wall of the sand container 1 and the first water return pipe 61 control valve on the upper side, start the water pump 32 to supply water to the sand container 1, adjust the height of the water tank 21 through the lifting device 22, thereby controlling the water level on the left side of the sand container 1, and adjust the control valve on the first return pipe 61, wait for After the water level stabilized, start the experiment.

Experiment 1: Simulating the three-dimensional flow field of a confined aquifer under natural conditions

The water tank 21 is raised by the lifting device 22, that is, the river water level is raised, and the confined aquifer is replenished. After the water level is stabilized, the water levels of the river water and each piezometric tube 42 are respectively measured, and the equal measurements of the confined aquifer on the plane and section are drawn. Confined water level line, and then draw the flow network of the confined aquifer on the plane and section, so as to reflect its three-dimensional flow field.

Experiment 2: Simulating the three-dimensional flow field of a confined aquifer under mining conditions

On the basis of Experiment 1, the pumping capacity of the water pipe 15 is adjusted by the control valve on the first return pipe 5. The water pipe 15 is a simulated water well. 15 of the water level, draw the pressure-measured water level line of the confined aquifer on the plane and section, and then draw the flow network of the confined aquifer on the plane and section, so as to reflect the change of the three-dimensional flow field of the confined aquifer under the mining condition .

Experiment 3: Simulating the three-dimensional flow field of a confined aquifer under a double-aqueous medium

Change the single water-containing medium in the sand container 1 into two kinds of water-containing media with different properties, such as silt and coarse sand, and the interface between the two media should be kept at the second and third sides near the bottom surface of the sand container 1. Between the rows of pressure measuring nozzles, the same experimental method as Experiments 1 and 2 was used to simulate the three-dimensional flow field of the confined aquifer under the dual aqueous medium.

Experiment 4: Simulating the recharge, runoff, and discharge characteristics of a confined aquifer

Close the control valve on the first water return pipe 5 and return to the state before the experiment started:

(1) Comparing the relationship between the average hydraulic gradient and spring discharge

Raise the height of the water tank 21 by the lifting device 22, thereby raising the river water level. After the water level is stable, read the river water level, the water level and the flow rate of the second return pipe 61 on the drainage tank 6, that is, simulate the spring water level and spring flow rate, Calculate the average hydraulic gradient; change the river water level through the lifting device 22, and after the water level is stable, read the river water level, spring water level, and spring flow rate again, and calculate the average hydraulic gradient. Relationship;

(2) Comparing the relationship between spring flow and pumping well flow

Raise the river water level to ensure that the river water level always supplies the confined aquifer during the experiment. After the water level stabilizes, read the spring flow. Then, open the control valve on the first water return pipe 5, and the pumping pipe 15 simulates the pumping well to start pumping water. After the water level is stable, read the flow of the second water return pipe 61 and the water suction pipe 15. Finally, the relationship between spring flow change and pumping well flow is compared.

(3) Observation of artesian wells

Close the control valve on the first water return pipe 5, and return to the state before the experiment started. Raise the river water level to make the river water level as high as possible. After the water level is stable, open the switches on the three overflow pipes 18. The overflow pipes 18 simulate artesian wells, and observe whether the three overflow pipes 18 have a direct flow phenomenon. Then, lower the River water level, after the water level stabilizes, observe whether the direct current situation of three overflow pipes 18 has changed, repeat the above process, until part of the well no longer direct current.

The above-mentioned embodiment is only to describe the preferred implementation mode of the utility model, and is not to limit the scope of the utility model. Various modifications and improvements made should fall within the scope of protection determined by the claims of the present utility model.

Claims (10)

1. A confined aquifer test simulation device is characterized in that: comprise sand and soil container (1), water inlet height control device (2), water supply device (3), pressure measuring observation device (4), sand and soil container (1) Placed obliquely, the top of the side wall at the higher end of the sand container (1) is provided with a first water inlet pipe (12), and a switch is provided on the first water inlet pipe (12), and the front and rear of the sand container (1) Several pressure measuring nozzles (13) are evenly distributed on the side wall and the bottom surface, the pressure measuring nozzles (13) are tubular, and the pressure measuring nozzles (13) are provided with sieve holes on the pipe wall of the inner part of the sand container (1). Each pressure measuring nozzle (13) is respectively connected to a pressure measuring tube (42) of the pressure measuring observation device (4) through a connecting pipe (14), and a pumping pipe (15) is provided at the center of the bottom of the sand container (1) , the suction pipe (15) is provided with a sieve hole in the part inside the sand container (1), and the suction pipe (15) is provided with a control valve and a flow meter in the external part of the sand container (1), and the sand container (1) A drainage box (6) is fixed outside the side wall of the lower end of the drainage box (6). The bottom of the drainage box (6) is provided with a second return pipe (61). The second return pipe (61) is provided with a control valve and a flow meter. A water outlet (62) is provided on the side wall between the container (1) and the drainage box (6), and a pressure-bearing top cover (16) is detachably connected to the top of the sand container (1), and the pressure-bearing top cover (16) At least one overflow pipe (18) is provided on the top, the overflow pipe (18) is provided with a sieve hole at the part inside the sand container (1), and the overflow pipe (18) is provided with a screen hole at the part outside the sand container (1). There is a switch, the water inlet height control device (2) includes a water tank (21), a lifting device (22), the water tank (21) is connected to the lifting device (22), and the water tank (21) is divided into a water supply tank (210) and an overflow tank by an overflow plate. Launder (211), the other end of the first water inlet pipe (12) is located at the bottom of the water supply tank (210), the side wall of the water supply tank (210) is also provided with a third water inlet pipe (212), the third water inlet pipe (212 ) is connected with a water supply device (3), and the bottom of the overflow tank (211) is provided with a third water return pipe (213). 2. the confined aquifer test simulation device as claimed in claim 1, is characterized in that: described water supply device (3) comprises water tank (31) and the water pump (32) that is located in water tank (31), water tank (31) ) is provided with a fourth water inlet pipe (33), the fourth water inlet pipe (33) is provided with a switch, the water outlet of the water pump (32) is connected with the third water inlet pipe (212), and the third water return pipe (213) The other end is located in the water tank (31). 3. the confined aquifer test simulation device as claimed in claim 2, is characterized in that: described pumping pipe (15) is connected with the first water return pipe (5), and the first water return pipe (5) and water supply device (3) ) of the water tank (31) is connected. 4. The confined aquifer test simulation device according to claim 2, characterized in that: the second return pipe (61) communicates with the water tank (31) of the water supply device (3). 5. The confined aquifer test simulation device according to claim 1, characterized in that: the angle between the bottom surface of the sand container (1) and the horizontal plane is 20-30°. 6. The confined aquifer test simulation device according to claim 1, characterized in that: the mesh on the pressure measuring nozzle (13) is wrapped with a wire mesh. 7. The confined aquifer test simulation device according to claim 1, characterized in that: the mesh of the suction pipe (15) is wrapped with wire mesh. 8. The confined aquifer test simulation device according to claim 1, characterized in that: the mesh on the overflow pipe (18) is wrapped with wire mesh. 9. The confined aquifer test simulation device according to claim 1, characterized in that: a wire mesh (63) is provided on the inner side of the side wall between the sand container (1) and the drainage box (6). 10. The confined aquifer test simulation device as claimed in claim 1, characterized in that: the pressure measurement observation device (4) comprises a pressure measurement plate (41) and several pressure measurement plates arranged side by side on the pressure measurement plate (41). Pressure pipe (42), described elevating device (22) is fixed pulley block.

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