Experimental device for underground water pumping and recharging

Abstract

The invention discloses an underground water pumping and recharging experiment device, and relates to the technical field of water pumping and recharging experiments, the underground water pumping and recharging experiment device comprises a water tank, the top of the water tank is provided with a mounting plate, one side of the mounting plate is provided with a plurality of supporting structure groups, each supporting structure group comprises a plurality of supporting structures, and each supporting structure is slidably inserted with a test frame; according to the invention, the plurality of supporting structures are respectively provided with the plurality of test frames, so that the plurality of test frames on the same supporting structure group can be combined up and down so as to contain soil with different soil properties for testing; the test frame can be freely detached, so that the soil after the test can be conveniently treated, the recharge test can be conveniently performed on the soil with different soil texture distributions, the test efficiency is improved, the accuracy of the test result is improved, and the water pressure detection device can freely enter or be separated from the test frame, so that the damage during the cleaning of the soil is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of water pumping and recharging experiments, and in particular to an underground water pumping and recharging experimental device. Background Art

[0002] Excessive exploitation of groundwater will cause a series of regional environmental geological problems, such as groundwater level drop, land subsidence, seawater intrusion, wetland shrinkage and ground vegetation degradation. Groundwater recharge is a positive and effective means to increase groundwater recharge. Recharging abundant rainwater or other surface water in the rainy season into the aquifer can effectively alleviate the related problems caused by excessive groundwater exploitation.

[0003] For groundwater recharge, since different soil geology will affect the recharge rate, the traditional groundwater pumping and recharge experimental device cannot reflect the influence of soil with different geology on the recharge rate. The existing utility model patent with patent announcement number CN214334619U discloses an experimental device for groundwater pumping and recharge, which is jointly constructed by the arrangement of a circulation box, an experimental box, a filter tube, a clay layer, a coarse sand layer, a fine sand layer, a fine pebble layer, a crushed stone layer, a connecting block, a flow meter, a recharge pipe and a branch pipe, wherein water is pumped into the experimental box by simulating the method of groundwater extraction, and the groundwater slowly seeps into the soil, and filter pipes are buried in different soils. At this time, groundwater can be introduced into the inner cavity of the filter pipe through the filter pipe, and then flow into the branch pipe through the recharge pipe, and when the recharge pipe is flowing, the water flow pressure can be detected by a water pressure gauge and then transmitted to an external experimental computer.

[0004] However, the above utility model patent still has corresponding problems: since the clay layer, coarse sand layer, fine sand layer, small pebble layer and gravel layer in the experimental box are stacked in sequence in the vertical direction, and the water pressure gauge is set on the reinjection pipe located inside the experimental box and is completely located inside the soil, when cleaning the soil after the experiment is completed, it is not only difficult to remove the soil from the inside of the experimental box, but the water pressure gauge is also easily damaged in the process of removing the soil. Secondly, when conducting multiple reinjection experiments with different soil distribution conditions, the soil needs to be completely emptied before the distribution of the new soil can be adjusted, which affects the efficiency of the experiment. Summary of the invention

[0005] The purpose of the present invention is to provide an experimental device for underground water pumping and recharging to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: An experimental device for underground water pumping and recharging, comprising a water tank, a mounting plate is arranged on the top of the water tank, a plurality of support structure groups are arranged on one side of the mounting plate in the horizontal direction, each of the support structure groups comprises a plurality of support structures arranged on the side wall of the mounting plate at equal intervals in the vertical direction, a test frame for holding soil is slidably inserted on each of the support structures, and two adjacent test frames in the vertical direction are fitted together, a water pressure detection device for detecting the water pressure inside the soil is arranged on each of the support structures, and each of the water pressure detection devices can enter or leave the inside of the test frame from one side of the test frame, a closing structure is arranged on each of the test frames, and the closing structure is used to close or open the path on the test frame for the water pressure detection device to pass through, a plurality of flow detection devices are arranged on the other side of the mounting plate, and the plurality of flow detection devices are used to receive water seeping out of the corresponding test frame, and a pumping device for injecting water into the soil is connected to one side of the water tank; The top of each test frame has an opening, and the bottom of each test frame can be movably opened or closed. The side of each test frame facing the mounting plate can be opened to allow water to pass through and restrict soil from passing through, and can be closed.

[0007] As a preferred solution of the present invention, the support structure includes two support plates vertically arranged on one side of the mounting plate, and the two support plates are parallel to the vertical plane, and slots for inserting the test frame are provided on opposite sides of the two support plates, and the water pressure detection device and the closing structure are both arranged on the outer wall of the same support plate.

[0008] As a preferred embodiment of the present invention, the test frame includes two parallel side plates, a fixed plate and a movable filter plate, and the fixed plate and the movable filter plate are parallel to each other, the movable filter plate has a path for water to pass through, and the path can be opened or closed, the two side plates, the fixed plate and the movable filter plate together form a square frame, the bottom of the square frame is provided with a movable plug plate for closing or opening the bottom of the square frame, and the movable plug plate is flush with the bottom of the square frame and passes through the fixed plate to the other side, and the outer side wall of the fixed plate is provided with a movable sealing plate for closing the connection between the movable plug plate and the fixed plate.

[0009] As a preferred embodiment of the present invention, the movable filter plate includes a fixed filter plate connected to the ends of two side plates, a slide groove connected to the bottom of the fixed filter plate is provided on the top of the fixed filter plate, a first sealing plate is slidably inserted in the slide groove, a limiting groove extending to the bottom is provided on one side of the first sealing plate, a limiting rod is slidably inserted on one of the side plates, and the limiting rod is used to be inserted into the limiting groove and abut against the inner top of the limiting groove.

[0010] As a preferred solution of the present invention, the movable sealing plate includes a vertical slide plate slidably arranged on the outer side wall of the fixed plate, a paddle plate is arranged on the top of the vertical slide plate, and the paddle plate is perpendicular to the vertical slide plate, a movable groove is opened on the outer side wall of the fixed plate, and the vertical slide plate is slidably connected in the movable groove and is used to close the area where the movable plug plate passes through the fixed plate.

[0011] As a preferred solution of the present invention, the water pressure detection device includes a threaded sleeve vertically arranged on the outer side wall of the support plate, and the threaded sleeve extends to the inner side of the support plate, the threaded sleeve is threadedly connected to a threaded push rod, the end of the threaded push rod is fixedly connected to a conical seat through a plurality of connecting rods, and the conical surface on the conical seat faces away from the threaded push rod, and a water pressure gauge is arranged on the side of the conical seat facing the threaded push rod, and a channel for the water pressure gauge to pass through is opened on one of the side plates, and the end of the threaded push rod is adapted to the channel.

[0012] As a preferred solution of the present invention, the closed structure includes a second sealing plate slidably inserted at the end of one of the side plates, and a horizontal groove connected to the channel is opened in the horizontal direction on the side of the side plate facing away from the mounting plate, and the projection of the channel in the horizontal direction is located inside the projection of the horizontal groove in the horizontal direction, and the bottom of the horizontal groove is connected to a feed chute, and the bottom of the feed chute extends to connect with the outer wall of the side plate.

[0013] As a preferred solution of the present invention, the flow detection device includes a guide pipe arranged on the side wall of the mounting plate away from the supporting structure, a flow meter is arranged at the end of the guide pipe, and a discharge port connected to the guide pipe is obliquely opened on the mounting plate, and the discharge port is in contact with the fixed filter plate.

[0014] In the present invention, multiple test frames are respectively installed through multiple supporting structures, so that multiple test frames on the same supporting structure group can be combined up and down to hold soil of different soil properties for testing, and the test frames can be freely disassembled, which is not only convenient for processing the soil after the test, but also convenient for recharging experiments on soil with different soil properties, thereby improving the experimental efficiency and the accuracy of the experimental results. In addition, the water pressure detection device can freely enter or leave the test frame to avoid damage when cleaning the soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0016] Figure 1 The present invention provides a first-view structural schematic diagram of an underground water pumping and recharging experimental device.

[0017] Figure 2 A second perspective structural schematic diagram of an underground water pumping and recharging experimental device provided by the present invention; Figure 3 A third perspective structural schematic diagram of an experimental device for underground water pumping and recharging is provided for the present invention; Figure 4 A partial structural schematic diagram of an experimental device for underground water pumping and recharging is provided for the present invention; Figure 5 A structural schematic diagram of a first viewing angle of a test frame is provided for the present invention; Figure 6 A structural schematic diagram of a second viewing angle of a test frame is provided for the present invention; Figure 7 A schematic cross-sectional structure diagram of a test frame is provided for the present invention; Figure 8 A partial structural schematic diagram of a water pressure detection device is provided for the present invention; Fig. 9 A structural schematic diagram of a first sealing plate is provided for the present invention; Fig.10 The present invention provides Figure 1 A schematic diagram of the structure enlargement of part A shown in FIG. Fig.11 The present invention provides Figure 1 An enlarged schematic diagram of the structure of part B is shown in FIG.

[0018] The numbers in the figure represent the following: 1. Water tank; 2. Mounting plate; 3. Support structure; 4. Test frame; 5. Water pressure detection device; 6. Enclosure structure; 7. Flow detection device; 8. Pumping device; 301, support plate; 302, slot; 401, side plate; 402, fixed plate; 403, movable filter plate; 404, movable plug plate; 405, movable sealing plate; 406, fixed filter plate; 407, slide groove; 408, first sealing plate; 409, limit groove; 410, limit rod; 411, vertical slide plate; 412, paddle plate; 413, movable groove; 501, threaded sleeve; 502, threaded push rod; 503, conical seat; 504, water pressure gauge; 505, channel; 601, second sealing plate; 602, horizontal groove; 603, discharge chute; 701, diversion pipe; 702, flow meter; 703, discharge port. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0021] like Figures 1 to 11 As shown, the present invention provides an experimental device for underground water pumping and recharging, comprising a water tank 1, a mounting plate 2 is arranged on the top of the water tank 1, a plurality of support structure groups are arranged on one side of the mounting plate 2 in the horizontal direction, each support structure group comprises a plurality of support structures 3 arranged on the side wall of the mounting plate 2 at equal intervals in the vertical direction, a test frame 4 for holding soil is slidably inserted on each support structure 3, and two adjacent test frames 4 in the vertical direction are fitted together, a water pressure detection device 5 for detecting the internal water pressure of the soil is arranged on each support structure 3, and each water pressure detection device 5 can enter or move away from the inside of the test frame 4 from one side of the test frame 4, a closing structure 6 is arranged on each test frame 4, and the closing structure 6 is used to close or open the path on the test frame 4 for the water pressure detection device 5 to pass through, a plurality of flow detection devices 7 are arranged on the other side of the mounting plate 2, and the plurality of flow detection devices 7 are used to receive water seeping out of the corresponding test frame 4, and a pumping device 8 for injecting water into the soil is connected to one side of the water tank 1.

[0022] Among them, the top of each test frame 4 has an opening, and the bottom of each test frame 4 can be movably opened or closed. The side of each test frame 4 facing the mounting plate 2 can be opened to allow water to pass through and restrict the passage of soil, and can be closed.

[0023] In actual application, the present application is filled with soils of different soil types in multiple test frames 4 according to the test requirements, and then the multiple test frames 4 under the same test are respectively inserted into different support structures 3 of the same support structure group. After the installation is completed, except for the bottom test frame 4, the bottoms of the remaining test frames 4 above are opened, so that the multiple test frames 4 on the same support structure group are interconnected, the water pressure detection device 5 is inserted into the corresponding test frame 4, and one of the flow detection devices 7 is connected to the bottom test frame 4.

[0024] Subsequently, water is pumped from the water tank 1 into the uppermost test frame 4 by the pumping device 8. The water gradually penetrates into the soil below through the soil in the uppermost test frame 4. The water flow after passing through multiple layers of soil is detected by the flow detection device 7. At the same time, the water flow pressure in soils of different soil types is detected by the water pressure detection device 5. By analyzing these two data, the efficiency of underground water pumping and recharging is obtained.

[0025] After the experiment is completed, the multiple water pressure detection devices 5 are first pulled out of the corresponding test frames 4, and then the path on the test frame 4 for the water pressure detection devices 5 to pass through is closed by the closing structure 6 to prevent the soil and water in the test frame 4 from leaking to the outside of the water pressure detection devices 5 and the test frame 4, and to prevent the water pressure detection devices 5 from being damaged when cleaning the soil in the test frame 4. Then, the multiple test frames 4 are sequentially pulled out of the supporting structure 3 and dumped, which improves the convenience of operation and facilitates the replacement of soil for the next experiment.

[0026] By setting up multiple support structure groups, the device can carry out multiple groups of reinjection experiments at the same time, and can carry out reinjection experiments with the same or different soil distribution conditions, which not only improves the experimental efficiency, but also improves the accuracy of the test results.

[0027] The support structure 3 includes two support plates 301 vertically arranged on one side of the mounting plate 2, and the two support plates 301 are parallel to the vertical plane. The opposite sides of the two support plates 301 are provided with slots 302 for inserting the test frame 4, and the water pressure detection device 5 and the closing structure 6 are both arranged on the outer wall of the same support plate 301.

[0028] The corresponding test frame 4 is inserted into the slots 302 on the two support plates 301 to complete the installation of the test frame 4, and is easy to disassemble, so that it is easy to clean the soil in the test frame 4 after the experiment is completed, thereby improving the convenience of use.

[0029] Furthermore, the test frame 4 should be connected to the slot 302 by interference fit to avoid the stability of the test frame 4 during the experiment. A limit pin can also be set to pass through the support plate 301 to the outer wall of the test frame 4.

[0030] The test frame 4 includes two parallel side plates 401, a fixed plate 402 and a movable filter plate 403, and the fixed plate 402 and the movable filter plate 403 are parallel to each other. The movable filter plate 403 has a path for water to pass through, and the path can be opened or closed. The two side plates 401, the fixed plate 402 and the movable filter plate 403 together form a square frame. A movable plug plate 404 for closing or opening the bottom of the square frame is inserted at the bottom of the square frame, and the movable plug plate 404 is flush with the bottom of the square frame and is smaller than the size of the square frame, and passes through the fixed plate 402 to the other side. A movable sealing plate 405 for closing the connection between the movable plug plate 404 and the fixed plate 402 is provided on the outer side wall of the fixed plate 402.

[0031] Because when multiple upper and lower test frames 4 are used in combination, only the water flow of the lowest test frame 4 needs to pass through the flow detection device 7 to detect the water flow, so the movable filter plate 403 opens the path for water in the soil to pass through when necessary, or closes the path to limit the passage of water.

[0032] The square frame composed of the side plate 401, a fixed plate 402 and a movable filter plate 403 and the movable plug plate 404 at the bottom hold the soil together. When the upper and lower test frames 4 are used in combination, the movable plug plates 404 at the bottom of the upper test frame 4 are all pulled out, so that the upper and lower test frames 4 are connected in sequence, so that the water flows infiltrate into the lower test frame 4 in sequence.

[0033] After the movable plug plate 404 is pulled out, since the bottom of the movable plug plate 404 is flush with the bottom of the square frame and smaller than the size of the square frame, the contact surfaces of the upper and lower test frames 4 can be fitted and closed, thereby preventing soil and water from leaking from the contact points of the upper and lower test frames 4. In addition, since the movable plug plate 404 is pulled out from the fixed plate 402, a passage for the movable plug plate 404 to be pulled out is provided at the bottom of the fixed plate 402, and the soil and water in the test frame 4 can pass through this path and leak. At this time, the passage is closed by the movable sealing plate 405, thereby ensuring the sealing of the entire test frame 4, preventing soil and water from leaking, and ensuring the accuracy of the experimental results.

[0034] The movable filter plate 403 includes a fixed filter plate 406 connected to the ends of the two side plates 401, a slide groove 407 connected to the bottom of the fixed filter plate 406 is opened on the top of the fixed filter plate 406, a first sealing plate 408 is slidably inserted in the slide groove 407, and a limiting groove 409 extending to the bottom is opened on one side of the first sealing plate 408, a limiting rod 410 is slidably inserted on one of the side plates 401, and the limiting rod 410 is used to be inserted into the limiting groove 409 and abut against the inner top of the limiting groove 409.

[0035] Before inserting the first sealing plate 408 into the slide groove 407, first insert the limiting rod 410 into the side plate 401, and then insert the first sealing plate 408 into the slide groove 407 in the vertical direction. At this time, the end of the limiting rod 410 enters the limiting groove 409 from the bottom of the limiting groove 409. When the first sealing plate 408 descends along the slide groove 407 to the inner top of the limiting rod 410 and the limiting groove 409, the top of the first sealing plate 408 is flush with the top of the square frame, and the bottom of the first sealing plate 408 is flush with the bottom of the square frame and cooperates with the movable plug plate 404, so as to limit the water in the soil from the fixed filter Plate 406 seeps out into the flow detection device 7, and the first sealing plates 408 in the upper and lower test frames 4 contact each other, which can prevent water from leaking from the upper test frame 4 into the lower test frame 4. When the fixed filter plate 406 is pulled out from the chute 407, water in the soil can seep out from the fixed filter plate 406 into the flow detection device 7. At the same time, the soil is restricted in the square frame by the fixed filter plate 406. According to the experimental requirements, the first sealing plate 408 on the lowest test frame 4 is pulled out, and the remaining test frames 4 restrict water from flowing into the flow detection device 7 through the first sealing plates 408 that contact each other from top to bottom.

[0036] The movable closing plate 405 includes a vertical slide plate 411 slidably set on the outer wall of the fixed plate 402, a paddle plate 412 is set on the top of the vertical slide plate 411, and the paddle plate 412 is perpendicular to the vertical slide plate 411, a movable groove 413 is opened on the outer wall of the fixed plate 402, and the vertical slide plate 411 is slidably connected in the movable groove 413, and is used to close the area where the movable plug plate 404 passes through the fixed plate 402.

[0037] After the movable plug plate 404 is pulled out, the vertical slide plate 411 is driven to slide downward along the movable groove 413 until it is flush with the bottom of the square frame by pushing the dial plate 412. At this time, the vertical slide plate 411 abuts against the top of the test frame 4 below, thereby closing the area on the fixed plate 402 for the movable plug plate 404 to pass through, preventing water and soil leakage.

[0038] The water pressure detection device 5 includes a threaded sleeve 501 vertically arranged on the outer wall of the support plate 301, and the threaded sleeve 501 extends to the inner side of the support plate 301, and the threaded sleeve 501 is connected to a threaded push rod 502 through the inner thread of the threaded sleeve 501, and the end of the threaded push rod 502 is fixedly connected to a conical seat 503 through a plurality of connecting rods, and the conical surface on the conical seat 503 is away from the threaded push rod 502, and a water pressure gauge 504 is arranged on the side of the conical seat 503 facing the threaded push rod 502, and a channel 505 for the water pressure gauge 504 to pass through is opened on one of the side plates 401, and the end of the threaded push rod 502 is adapted to the channel 505.

[0039] By rotating the threaded push rod 502, the threaded push rod 502 moves along the threaded sleeve 501 into the test frame 4. At this time, the closing structure 6 opens the channel 505 on the test frame 4 to allow the water pressure gauge 504 to enter. The conical seat 503 is pushed by the threaded push rod 502 to drive the water pressure gauge 504 to move synchronously. The conical surface of the conical seat 503 squeezes the soil, so that the conical seat 503 and the water pressure gauge 504 enter the interior of the test frame 4 until the threaded push rod 502 contacts the channel 505 to close the channel 505, thereby limiting the outflow of soil and water from the test frame 4.

[0040] When the experiment is completed, the threaded push rod 502 is rotated in the opposite direction to separate the conical seat 503 and the water pressure gauge 504 from the test frame 4, and then the channel 505 is closed by the closing structure 6 to avoid damage to the water pressure gauge 504 when cleaning the soil in the test frame 4.

[0041] In this embodiment, the water pressure gauge 504 is a prior art, such as the water pressure gauge disclosed in the utility model patent with patent publication number CN214334619U.

[0042] The closing structure 6 includes a second closing plate 601 slidably inserted at the end of one of the side plates 401, and a horizontal groove 602 connected to the channel 505 is opened in the horizontal direction on the side of the side plate 401 facing away from the mounting plate 2, and the projection of the channel 505 in the horizontal direction is located inside the projection of the horizontal groove 602 in the horizontal direction, and the bottom of the horizontal groove 602 is connected to a discharge chute 603, and the bottom of the discharge chute 603 extends to connect with the outer wall of the side plate 401.

[0043] By pushing the second sealing plate 601 to slide along the horizontal groove 602 , the second sealing plate 601 can be moved to the channel 505 , thereby closing the channel 505 . When the second sealing plate 601 is away from the channel 505 , the channel 505 is opened.

[0044] When the threaded push rod 502 drives the water pressure gauge 504 away from the test frame 4, a portion of the soil in the test frame 4 is pushed away by the conical seat 503 and the water pressure gauge 504 and carried away to the channel 505. By providing the discharge chute 603, the carried away soil can slide through the discharge chute 603 to the outside of the test frame 4, thereby avoiding blockage of the channel 505 and part of the horizontal groove 602.

[0045] The flow detection device 7 includes a guide pipe 701 arranged on the side wall of the mounting plate 2 away from the support structure 3, a flow meter 702 is arranged at the end of the guide pipe 701, and a discharge port 703 connected to the guide pipe 701 is obliquely opened on the mounting plate 2, and the discharge port 703 is in contact with the fixed filter plate 406.

[0046] The water passing through the fixed filter plate 406 enters the diversion pipe 701 from the discharge port 703, and the flow rate of the water is measured by the flow meter 702 and the information is recorded.

[0047] In this embodiment, the flow meter 702 is a prior art, such as the flow meter disclosed in the utility model patent with patent publication number CN214334619U.

[0048] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention.

[0049] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. An experimental device for underground water pumping and recharging, comprising a water tank (1), characterized in that: The water tank (1) is provided with a mounting plate (2) on the top, and a plurality of support structure groups are provided on one side of the mounting plate (2) in the horizontal direction, each of the support structure groups comprising a plurality of support structures (3) arranged on the side wall of the mounting plate (2) at equal intervals in the vertical direction, each of the support structures (3) being provided with a test frame (4) for containing soil in a slidable manner, and two adjacent test frames (4) in the vertical direction being fitted together, each of the support structures (3) being provided with a water pressure detection device (5) for detecting the water pressure inside the soil, and each of the water The water pressure detection devices (5) can enter or leave the interior of the test frame (4) from one side of the test frame (4); each of the test frames (4) is provided with a closing structure (6), and the closing structure (6) is used to close or open a path on the test frame (4) for the water pressure detection device (5) to pass through; a plurality of flow detection devices (7) are provided on the other side of the mounting plate (2), and the plurality of flow detection devices (7) are used to receive water seeping out of the corresponding test frame (4); and a pumping device (8) for injecting water into the soil is connected to one side of the water tank (1); The top of each test frame (4) has an opening, and the bottom of each test frame (4) can be movably opened or closed, and the side of each test frame (4) facing the mounting plate (2) can be opened to allow water to pass through and restrict the passage of soil, and can be closed.

2. The experimental device for underground water pumping and recharging according to claim 1, characterized in that: The support structure (3) comprises two support plates (301) vertically arranged on one side of the mounting plate (2), and the two support plates (301) are parallel to the vertical plane. The two support plates (301) are provided with slots (302) for inserting the test frame (4) on opposite sides thereof, and the water pressure detection device (5) and the closed structure (6) are arranged on the outer side wall of the same support plate (301).

3. The experimental device for underground water pumping and recharging according to claim 2, characterized in that: The test frame (4) comprises two parallel side plates (401), a fixed plate (402) and a movable filter plate (403), wherein the fixed plate (402) and the movable filter plate (403) are parallel to each other, the movable filter plate (403) has a path for water to pass through, and the path can be opened or closed, the two side plates (401), the fixed plate (402) and the movable filter plate (403) together form a square frame, the bottom of the square frame is provided with a movable plug plate (404) for closing or opening the bottom of the square frame, and the movable plug plate (404) is flush with the bottom of the square frame and passes through the fixed plate (402) to the other side, and the outer side wall of the fixed plate (402) is provided with a movable sealing plate (405) for closing the connection between the movable plug plate (404) and the fixed plate (402).

4. The underground water pumping and recharging experimental device according to claim 3 is characterized in that: The movable filter plate (403) comprises a fixed filter plate (406) connected to the ends of the two side plates (401); a slide groove (407) communicating with the bottom of the fixed filter plate (406) is provided at the top of the fixed filter plate (406); a first sealing plate (408) is slidably inserted in the slide groove (407); a limiting groove (409) extending to the bottom is provided on one side of the first sealing plate (408); a limiting rod (410) is slidably inserted on one of the side plates (401); and the limiting rod (410) is used to be inserted into the limiting groove (409) and abut against the inner top of the limiting groove (409).

5. The underground water pumping and recharging experimental device according to claim 3 is characterized in that: The movable closing plate (405) comprises a vertical slide plate (411) slidably arranged on the outer side wall of the fixed plate (402); a shift plate (412) is arranged on the top of the vertical slide plate (411), and the shift plate (412) is perpendicular to the vertical slide plate (411); a movable groove (413) is opened on the outer side wall of the fixed plate (402), and the vertical slide plate (411) is slidably connected in the movable groove (413) and is used to close the area where the movable plug plate (404) passes through the fixed plate (402).

6. The underground water pumping and recharging experimental device according to claim 3 is characterized in that: The water pressure detection device (5) comprises a threaded sleeve (501) vertically arranged on the outer wall of the support plate (301), and the threaded sleeve (501) extends to the inner side of the support plate (301); the threaded sleeve (501) is internally threadedly connected to a threaded push rod (502); the end of the threaded push rod (502) is fixedly connected to a conical seat (503) via a plurality of connecting rods, and the conical surface of the conical seat (503) faces away from the threaded push rod (502); a water pressure gauge (504) is arranged on the side of the conical seat (503) facing the threaded push rod (502); a channel (505) for the water pressure gauge (504) to pass through is opened on one of the side plates (401), and the end of the threaded push rod (502) is matched with the channel (505).

7. The underground water pumping and recharging experimental device according to claim 3 is characterized in that: The closed structure (6) comprises a second sealing plate (601) slidably inserted at the end of one of the side plates (401); a horizontal groove (602) connected to the channel (505) is provided on the side of the side plate (401) facing away from the mounting plate (2) in the horizontal direction; the projection of the channel (505) in the horizontal direction is located inside the projection of the horizontal groove (602) in the horizontal direction; the bottom of the horizontal groove (602) is connected to a material discharge groove (603); and the bottom of the material discharge groove (603) extends to be connected to the outer wall of the side plate (401).

8. The underground water pumping and recharging experimental device according to claim 3 is characterized in that: The flow detection device (7) comprises a flow guide pipe (701) arranged on the side wall of the mounting plate (2) away from the support structure (3), a flow meter (702) being arranged at the end of the flow guide pipe (701), and a discharge port (703) communicating with the flow guide pipe (701) being obliquely opened on the mounting plate (2), and the discharge port (703) being in contact with the fixed filter plate (406).

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