Multistage liquid level control device for sand drain immersion test

Abstract

The utility model discloses a multistage liquid level control device for a sand drain immersion test, which comprises a water supply mechanism, a water injection intelligent control mechanism and a water level monitoring module, and the water supply mechanism comprises a water injection pipe, a water storage barrel and an electromagnetic induction valve arranged at the top of the water injection pipe; the water injection intelligent control mechanism comprises a liquid level control module, a plurality of groups of liquid level probes arranged at the lower part of the water injection pipe and a ground wire probe arranged at the bottom end of the water injection pipe, and the liquid level probes and the ground wire probe are controlled by the liquid level control module; the water level monitoring module comprises a water level monitoring pipe arranged in the immersion exploratory well, a steel ruler water level gauge arranged in the water level monitoring pipe and a pore water pressure gauge arranged at the bottom of the immersion exploratory well. The deep loess collapsibility test device is reasonable in design, stable control over the multi-stage design liquid level water head of a bottom-to-top water immersion test of the exploratory well is achieved, test errors caused by instability of the water head in the exploratory well in the test process can be reduced, and the accuracy of the deep loess collapsibility test is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of geotechnical engineering tests, and particularly relates to a multi-level liquid level control device for a sand well soaking test. Background Technique

[0002] The sand well soaking test is a field test method for evaluating the collapsibility of loess strata. The test can effectively simulate the collapsible deformation conditions of loess strata when affected by water in the natural state, and provide a scientific basis for engineering design and construction. During the test, an immersion exploration well is excavated in the collapsible loess site, and water is directly introduced into the deep collapsible loess strata and the soil around the exploration well to measure the collapsible deformation amount of the deep loess strata. During the test process, by observing the collapsible deformation amount, water consumption, water infiltration range, ground cracks and other contents, the collapsibility of the deep loess strata and the stability of the foundation can be accurately evaluated.

[0003] When conducting the on-site sand well soaking test of deep collapsible loess, two key points are to control the liquid level stability in the exploration well and measure the formation deformation. For the latter, there are currently many deep soil deformation monitoring methods for reference. For the method of maintaining the liquid level stability in the exploration well, in previous tests, grading soaking was carried out by controlling different water inflow levels, that is, the liquid level in the exploration well was raised by increasing the water inflow, and the research on the control of the liquid level height in the exploration well was not involved. The drawback of this method is that the liquid level height in the exploration well cannot be known after increasing the water inflow, and for the experimenters, it is impossible to accurately determine the thickness of the deep loess layer infiltrated by water. Therefore, there are large errors in the results of judging the collapsibility of deep loess by using this method.

[0004] Therefore, there is currently a lack of a multi-level liquid level control device for a sand well soaking test with reasonable design, which can realize the stable control of the multi-level designed liquid level heads for the bottom-up soaking test of the exploration well, reduce the test errors caused by the unstable water head in the exploration well during the test process, and improve the accuracy of the collapsibility test of deep loess. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a multi-level liquid level control device for a sand well soaking test aiming at the deficiencies in the above-mentioned prior art. The device has reasonable design, realizes the stable control of the multi-level designed liquid level heads for the bottom-up soaking test of the exploration well, can reduce the test errors caused by the unstable water head in the exploration well during the test process, and improves the accuracy of the collapsibility test of deep loess.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is: a multi-level liquid level control device for sand well immersion test, which is characterized in that it includes a water supply mechanism, a water injection intelligent control mechanism and a water level monitoring module. The water supply mechanism includes a water injection pipe arranged in the immersion exploration well, a water storage bucket connected to the water injection pipe, and an electromagnetic induction valve arranged at the top of the water injection pipe;

[0007] The water injection intelligent control mechanism includes a liquid level control module, multiple groups of liquid level probes arranged at the lower part of the water injection pipe, and a ground wire probe arranged at the bottom end of the water injection pipe. The liquid level probes and the ground wire probe are both controlled by the liquid level control module;

[0008] The water level monitoring module includes a water level monitoring pipe arranged in the immersion exploration well, a steel tape water level gauge arranged at the top of the immersion exploration well, and a pore water pressure gauge arranged at the bottom of the immersion exploration well.

[0009] The above-mentioned multi-level liquid level control device for sand well immersion test is characterized in that: the liquid level control module includes an intelligent control switch arranged at the top of the immersion exploration well, a water stop probe grading controller and a water replenishment probe grading controller. The intelligent control switch controls the electromagnetic valve, and the output ends of the ground wire probe, the water stop probe grading controller and the water replenishment probe grading controller are all connected to the intelligent control switch.

[0010] The above-mentioned multi-level liquid level control device for sand well immersion test is characterized in that: multiple groups of the liquid level probes are arranged at intervals along the height direction of the lower part of the water injection pipe. Each group of the liquid level probes includes a water replenishment probe and a water stop probe arranged on the water injection pipe. The water replenishment probe is connected to the input end of the water replenishment probe grading controller, and the water stop probe is connected to the input end of the water stop probe grading controller.

[0011] The above-mentioned multi-level liquid level control device for sand well immersion test is characterized in that: the water storage bucket is arranged at the top of the immersion exploration well, and the electromagnetic induction valve is arranged on the pipe section of the water injection pipe located at the top of the immersion exploration well.

[0012] The above-mentioned multi-level liquid level control device for sand well immersion test is characterized in that: a gravel layer and an excavated soil backfill layer are arranged in the immersion exploration well from bottom to top, and the top height of the gravel layer is higher than the topmost liquid level probe.

[0013] The above-mentioned multi-level liquid level control device for sand well immersion test is characterized in that: the liquid level probes and the ground wire probe are installed on the outer side wall of the water injection pipe through probe fixing parts. The probe fixing parts include a square steel box and an opening plate arranged on the side of the square steel box close to the water injection pipe. A receiving groove is arranged on the outer side wall of the opening plate, a U-shaped pull ring is arranged at the bottom of the receiving groove, a hoop for clamping the outer side wall of the water injection pipe is arranged through the U-shaped pull ring, and punching holes are arranged on the side wall of the square steel box.

[0014] The utility model has the following advantages compared with the prior art:

[0015] 1. The multi-level liquid level control device for the sand well immersion test of the utility model has a simple structure, reasonable design and convenient installation and layout.

[0016] 2. The utility model is provided with multiple groups of liquid level probes at the lower part of the water injection pipe and a ground wire probe at the bottom end of the water injection pipe. Through the cooperation of each group of liquid level probes and the ground wire probe, the liquid level monitoring in the exploration well is realized, and the accurate control of each level of liquid level in the immersion test is ensured.

[0017] 3. The utility model is provided with a liquid level control module to realize the switching control between the water stop probe and the water replenishing probe in multiple groups of preset liquid level probes, so as to enable the tester to realize the switching of the immersion liquid level grade in the sand well immersion test through simple operations; and cooperate with the opening and closing of the electromagnetic induction valve to realize the multi-level liquid level immersion control of the deep loess sand well immersion test.

[0018] 4. By using the water level monitoring module, the utility model can visually reflect the current water level height of the exploration well through the steel tape water level gauge and the pore water pressure gauge during the sand well immersion test. By comparing the water level detection reading with the designed immersion depth of the test liquid level probe, the tester can conveniently grasp the sand well immersion situation in real time.

[0019] In summary, the utility model has a reasonable design, realizes the stable control of the multi-level designed liquid level water head of the bottom-up immersion test of the exploration well, can reduce the test error caused by the unstable water head in the exploration well during the test, and improves the accuracy of the collapsibility test of deep loess.

[0020] The technical solution of the utility model will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0021] Figure 1 is the structural schematic diagram of the utility model.

[0022] Figure 2 is the structural schematic diagram of the intelligent control switch of the utility model.

[0023] Figure 3 is the structural schematic diagram of the water stop probe grading controller and the water replenishing probe grading controller of the utility model.

[0024] Figure 4 is the structural schematic diagram of the water injection pipe and the probe fixing part of the utility model.

[0025] Figure 5 is the structural schematic diagram of the probe fixing part of the utility model.

[0026] Description of the reference numerals:

[0027] 1—Infiltration exploration well; 1-1—Gravel layer;

[0028] 1-2—Backfill layer of excavated soil; 2—Water storage bucket; 3—Water injection pipe;

[0029] 4—Electromagnetic induction valve; 4-1—Connecting pipe orifice; 4-2—Electromagnetic induction valve cable;

[0030] 5—Power supply; 6—Intelligent control switch; 6-1—Power input interface;

[0031] 6-2—Load output interface; 6-3—Probe interface; 6-4—Signal lamp;

[0032] 6-5—Switch control button; 7—Water cut-off probe grading controller; 7-1—Knob;

[0033] 8—Water replenishment probe grading controller; 9—Ground wire probe cable;

[0034] 10—Water cut-off probe cable; 11—Water cut-off probe adapter;

[0035] 12—Water replenishment probe cable; 13—Water replenishment probe adapter;

[0036] 14—Ground wire probe; 15—Water cut-off probe; 15-1—The first water cut-off probe;

[0037] 15-2—The second water cut-off probe; 15-3—The third water cut-off probe;

[0038] 15-4—The fourth water cut-off probe; 16—Water replenishment probe;

[0039] 16-1—The first water replenishment probe; 16-2—The second water replenishment probe;

[0040] 16-3—The third water replenishment probe; 16-4—The fourth water replenishment probe;

[0041] 17—Probe fixing part; 17-1—Square steel box; 17-2—Open plate;

[0042] 17-3—U-shaped pull ring; 17-4—Receiving groove; 17-5—Hoop;

[0043] 17-6—Punched hole; 19—Water level monitoring pipe; 20—Steel tape water level gauge;

[0044] 21—Steel tape water level gauge; 22—Pore water pressure gauge. Specific implementation method

[0045] As Figures 1 to 5A multi-level liquid level control device for a sand well immersion test, including a water supply mechanism, a water injection intelligent control mechanism and a water level monitoring module. The water supply mechanism includes a water injection pipe 3 arranged in the immersion exploration well 1, a water storage bucket 2 connected to the water injection pipe 3, and an electromagnetic induction valve 4 arranged at the top of the water injection pipe 3;

[0046] The water injection intelligent control mechanism includes a liquid level control module, multiple groups of liquid level probes arranged at the lower part of the water injection pipe 3, and a ground wire probe 14 arranged at the bottom end of the water injection pipe 3. The liquid level probes and the ground wire probe 14 are both controlled by the liquid level control module;

[0047] The water level monitoring module includes a water level monitoring pipe 19 arranged in the immersion exploration well 1, a steel tape water level gauge 20 arranged at the top of the immersion exploration well 1, and a pore water pressure gauge 22 arranged at the bottom of the immersion exploration well 1.

[0048] In this embodiment, the liquid level control module includes an intelligent control switch 6 arranged at the top of the immersion exploration well 1, a water stop probe grading controller 7 and a water replenishment probe grading controller 8. The intelligent control switch 6 controls the electromagnetic valve 4, and the output ends of the ground wire probe 14, the water stop probe grading controller 7 and the water replenishment probe grading controller 8 are all connected to the intelligent control switch 6.

[0049] In this embodiment, multiple groups of the liquid level probes are arranged at intervals along the height direction of the lower part of the water injection pipe 3. Each group of the liquid level probes includes a water replenishment probe 16 and a water stop probe 15 arranged on the water injection pipe 3. The water replenishment probe 16 is connected to the input end of the water replenishment probe grading controller 8, and the water stop probe 15 is connected to the input end of the water stop probe grading controller 7.

[0050] In this embodiment, the water storage bucket 2 is arranged at the top of the immersion exploration well 1, and the electromagnetic induction valve 4 is arranged on the pipe section of the water injection pipe 3 located at the top of the immersion exploration well 1.

[0051] In this embodiment, a gravel layer 1-1 and an excavated soil backfill layer 1-2 are arranged in the immersion exploration well 1 from bottom to top, and the top height of the gravel layer 1-1 is higher than the topmost liquid level probe.

[0052] In this embodiment, the liquid level probes and the ground wire probe 14 are installed on the outer side wall of the water injection pipe 3 through probe fixing parts 17. The probe fixing parts 17 include a square steel box 17-1 and an opening plate 17-2 arranged on the side of the square steel box 17-1 close to the water injection pipe 3. A receiving groove 17-4 is arranged on the outer side wall of the opening plate 17-2, a U-shaped pull ring 17-3 is arranged at the bottom of the receiving groove 17-4, a hoop 17-5 for clamping on the outer side wall of the water injection pipe 3 is arranged through the U-shaped pull ring 17-3, and punching holes 17-6 are arranged on the side wall of the square steel box 17-1.

[0053] In this embodiment, the water storage bucket 2 is located on the ground and includes an inlet and an outlet for supplying water into the immersion test well 1 through the water injection pipe 3. The water storage bucket 2 has a relatively large volume to facilitate the replenishment of water in the immersion test well 1 during the test. When the liquid level in the water storage bucket 2 is relatively low, the water storage bucket 2 should be replenished in time to avoid the interruption of water replenishment into the immersion test well 1 due to water shortage in the water storage bucket 2, which may affect the accuracy of the test results.

[0054] In this embodiment, one end of the water injection pipe 3 is connected to the outlet of the water storage bucket 2, and the other end extends to the bottom of the immersion test well 1 to achieve bottom-up immersion of the immersion test well 1. A filter screen is provided at the bottom end of the water injection pipe 3 extending into the immersion test well 1 to prevent the pipe head from being blocked.

[0055] In this embodiment, the load output interface 6-2 of the intelligent control switch 6 is connected to the electromagnetic induction valve cable 4-2, and the connection pipe orifice 4-1 of the electromagnetic induction valve 4 is connected in series in the water injection pipe 3; the electromagnetic induction valve 4 is controlled by the intelligent control switch 6, and the injection or stop of water into the immersion test well 1 is controlled by controlling the opening and closing of the electromagnetic induction valve 4.

[0056] In this embodiment, multiple groups of liquid level probes and ground wire probes 14 are installed on the outer side wall of the water injection pipe 3 through probe fixing members 17, so that the installation positions of each group of liquid level probes meet the requirements of different levels of immersion.

[0057] In this embodiment, the opening plate 17-2 and the square steel box 17-1 can be freely opened and closed through a tightening screw. When the opening plate 17-2 is set to be open, it is convenient for construction personnel to install the water replenishment probe 16, the water stop probe 15, and the ground wire probe 14.

[0058] In this embodiment, a U-shaped pull ring 17-3 is provided at the bottom of the accommodation groove 17-4 so that the U-shaped pull ring 17-3 does not protrude, which is convenient for the opening plate 17-2 to be arranged close to the outer side wall of the water injection pipe 3. And by setting the U-shaped pull ring 17-3, it is not only convenient to pass through the hoop 17-5 to install the probe fixing member 17, but also convenient for the artificial lifting of the opening plate 17-2 to open and close.

[0059] In this embodiment, the probe fixing member 17 is provided to isolate the probe from direct contact with the gravel and the water injection pipe 3. When the water level in the immersion test well 1 drops, the probe is not affected by the water retained in the gravel gaps and the water retained on the wall of the water injection pipe 3.

[0060] In this embodiment, the intelligent control switch 6 uses a DF-96DK controller.

[0061] In this embodiment, during specific implementation, the power input interface 6-1 of the intelligent control switch 6 is connected to a 220-volt power supply 5 to supply power to the water injection intelligent control mechanism.

[0062] In this embodiment, during specific implementation, the water cut-off probe 15 in each group is 200 mm higher than the water replenishing probe 16.

[0063] In this embodiment, during specific implementation, the number of liquid level probes is four groups. The four groups of liquid level probes are successively divided into the first group of liquid level probes, the second group of liquid level probes, the third group of liquid level probes, and the fourth group of liquid level probes from bottom to top. The liquid level probes can refer to the conventional probes in the art.

[0064] In this embodiment, during specific implementation, the first group of liquid level probes includes the first water replenishing probe 16-1 and the first water cut-off probe 15-1, the second group of liquid level probes includes the second water replenishing probe 16-2 and the second water cut-off probe 15-2, the third group of liquid level probes includes the third water replenishing probe 16-3 and the third water cut-off probe 15-3, and the fourth group of liquid level probes includes the fourth water replenishing probe 16-4 and the fourth water cut-off probe 15-4.

[0065] In this embodiment, during specific implementation, the water cut-off probe cables 10 of the first water cut-off probe 15-1, the second water cut-off probe 15-2, the third water cut-off probe 15-3, and the fourth water cut-off probe 15-4 are respectively connected to the input ends of the first to fourth gears of the water cut-off probe grading controller 7. The water cut-off probe transfer wire 11 formed by connecting the fifth to eighth output ends of the water cut-off probe grading controller 7 is connected to the A terminal of the probe interface 6-3 in the intelligent control switch 6;

[0066] The water replenishing probe cables 12 of the first water replenishing probe 16-1, the second water replenishing probe 16-2, the third water replenishing probe 16-3, and the fourth water replenishing probe 16-4 are respectively connected to the input ends of the first to fourth gears of the water replenishing probe grading controller 8. The water replenishing probe transfer wire 13 formed by connecting the fifth to eighth output ends of the water replenishing probe grading controller 8 is connected to the B terminal of the probe interface 6-3 in the intelligent control switch 6;

[0067] The ground wire probe cable 9 of the ground wire probe 14 is connected to the D terminal of the probe interface 6-3 in the intelligent control switch 6.

[0068] In this embodiment, the water level monitoring pipe 19 is vertically arranged in the immersion exploration well 1. Water inlet holes of the water level pipe are evenly distributed on its side wall in the vertical direction for communicating with the water in the immersion exploration well 1, so as to make the water level in the water level monitoring pipe 19 consistent with the water level line in the immersion exploration well 1;

[0069] The water level probe 20 of the steel tape water level gauge 20 extends into the water level monitoring pipe 19; the steel tape water level gauge 20 is located on the ground. In the working state, the water level detection data is received in real time through the water level probe 20 and the water level height in the water level monitoring pipe 19 is reflected.

[0070] In this embodiment, the water cut-off probe grading controller 7 and the water replenishment probe grading controller 8 have the same structure, and both the water cut-off probe grading controller 7 and the water replenishment probe grading controller 8 adopt an LW26-20 / 3(0-5) change-over switch, and any one of the first to fourth gears is turned on by adjusting the knob 7-1.

[0071] In this embodiment, during specific implementation, after excavating the immersion inspection well 1, the bottom of the immersion inspection well 1 is sealed with a 200-mm-thick waterproof concrete layer to prevent water from directly infiltrating and flowing out from the bottom of the immersion inspection well 1 during the immersion process. Then, the geotextile is laid on the side wall of the immersion inspection well 1 within the immersion height range and fixed with U-shaped thick wire buckles to prevent soil particles from infiltrating into the immersion area during the immersion process and blocking the water injection pipe 3, the water inlet holes of the water level monitoring pipe 19, and the probe fixing member 17.

[0072] In this embodiment, during specific implementation, the connection between the probe cable and the probe is pasted with waterproof tape to prevent the cable from being immersed in water and short-circuited during the test.

[0073] In this embodiment, during specific implementation, the water injection pipe 3 and the water level monitoring pipe 19 are fixed on the side wall of the immersion inspection well 1 with U-shaped clamps, and one U-shaped clamp is arranged every 1 m.

[0074] In this embodiment, the pore water pressure gauge 22 is placed in the coarse sand, and the coarse sand and the pore water pressure gauge 22 are wrapped with geotextile and tied and fixed with thin iron wire. Then, the pore water pressure gauge 22 is hoisted and placed at the bottom of the immersion inspection well 1, and the cable of the pore water pressure gauge 22 is led out to the ground surface along the side wall of the immersion inspection well 1 with a PVC pipe with a diameter of not less than 25 mm.

[0075] In the present utility model, during specific use, the knobs 7-1 of the water cut-off probe grading controller 7 and the water replenishment probe grading controller 8 respectively point to the "1" to "4" gears. The switch control button 6-5 of the intelligent control switch 6 is turned on, and the color of the signal lamp 6-4 of the intelligent control switch 6 is observed. If it shows "red", the control circuit needs to be checked until it shows "green"; if it shows "green", the switch control button 6-5 of the intelligent control switch 6 is normally turned off, and then the immersion inspection well 1 is backfilled. A gravel layer 1-1 and an excavated soil backfill layer 1-2 are sequentially arranged from bottom to top. The top height of the gravel layer 1-1 is higher than the topmost liquid level probe until the immersion inspection well 1 is backfilled to the ground surface.

[0076] When conducting the inundation experiment in the inundation exploration well 1, rotate the knobs 7-1 of the water cut-off probe grading controller 7 and the water replenishment probe grading controller 8 to the "1" gear respectively for the first-stage inundation test, so as to realize the connection of the A and B wiring ports of the probe interface 6-3 in the intelligent control switch 6 to the first water cut-off probe 15-1 and the first water replenishment probe 16-2 at the first-stage inundation design height. At the same time, when the intelligent control switch 6 controls the electromagnetic induction valve 4 to open and inject water into the inundation exploration well 1 for the first time, the water will flow out from the bottom of the water injection pipe 3, realizing the inundation of the inundation exploration well 1 from bottom to top. When the water level rises until it touches the first water cut-off probe 15-1, the electromagnetic induction valve 4 is controlled to close, and the water injection pipe 3 stops injecting water. During the water injection process, the water in the inundation exploration well 1 infiltrates into the surrounding soil, and the water level in the well will also continue to drop. When the water level drops to the height of the first water replenishment probe 16-2, the intelligent control switch 6 controls the electromagnetic induction valve 4 to open, and the water injection pipe 3 starts injecting water again. This cycle continues until the liquid levels detected by the steel tape water level gauge 20 and the liquid levels obtained by converting the data detected by the pore water pressure gauge 22 are both the same as the height of the first water replenishment probe 15-2 or meet the required error range, and the deformation of the soil body after inundation at this level reaches the stable standard, that is, the first-stage inundation height test is completed;

[0077] Repeat the above process. Rotate the knobs 7-1 of the water cut-off probe grading controller 7 and the water replenishment probe grading controller 8 to the "2" gear respectively for the second-stage inundation test. The second water cut-off probe 15-2 and the second water replenishment probe 16-2 at the first-stage inundation design height are connected, that is, the second-stage inundation height test is completed;

[0078] Rotate the knobs 7-1 of the water cut-off probe grading controller 7 and the water replenishment probe grading controller 8 to the "3" gear respectively for the third-stage inundation test. The third water cut-off probe 15-3 and the third water replenishment probe 16-3 at the third-stage inundation design height are connected, that is, the third-stage inundation height test is completed;

[0079] Rotate the knobs 7-1 of the water cut-off probe grading controller 7 and the water replenishment probe grading controller 8 to the "4" gear respectively for the fourth-stage inundation test. The fourth water cut-off probe 15-4 and the fourth water replenishment probe 16-4 at the fourth-stage inundation design height are connected, that is, the fourth-stage inundation height test is completed.

[0080] In this embodiment, the liquid level in the exploration well is stabilized by the liquid level probe to be basically unchanged, simulating the underground water level rising condition. Therefore, the determination of the collapsible deformation characteristics of the deep loess is more in line with the actual collapsible stress state, and the determination result is more reliable, which can provide a reference for the method of determining the collapsibility of deep loess during the construction of underground projects in collapsible loess areas.

[0081] In summary, the design of the present utility model is reasonable, realizing the stable control of the multi-level designed liquid level heads for the immersion test of the exploration well from bottom to top, which can reduce the test errors caused by the unstable water head in the exploration well during the test and improve the accuracy of the collapsibility test of deep loess.

[0082] The above are only the preferred embodiments of the present utility model, and do not impose any limitations on the present utility model. Any simple modifications, changes, and equivalent structural changes made to the above embodiments according to the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A multi-level liquid level control device for a sand well immersion test, characterized in that : It includes a water supply mechanism, a water injection intelligent control mechanism and a water level monitoring module. The water supply mechanism includes a water injection pipe (3) arranged in the immersion exploration well (1), a water storage bucket (2) connected to the water injection pipe (3), and an electromagnetic induction valve (4) arranged at the top of the water injection pipe (3); The water injection intelligent control mechanism includes a liquid level control module, multiple groups of liquid level probes arranged at the lower part of the water injection pipe (3), and a ground wire probe (14) arranged at the bottom end of the water injection pipe (3). The liquid level probes and the ground wire probe (14) are both controlled by the liquid level control module; The water level monitoring module includes a water level monitoring pipe (19) arranged in the immersion exploration well (1), a steel tape water level gauge (20) arranged at the top of the immersion exploration well (1), and a pore water pressure gauge (22) arranged at the bottom of the immersion exploration well (1).

2. The multi-level liquid level control device for the sand well immersion test according to claim 1, wherein: The liquid level control module includes an intelligent control switch (6), a water stop probe grading controller (7) and a water replenishment probe grading controller (8) arranged at the top of the immersion exploration well (1). The intelligent control switch (6) controls the electromagnetic induction valve (4). The output ends of the ground wire probe (14), the water stop probe grading controller (7) and the water replenishment probe grading controller (8) are all connected to the intelligent control switch (6).

3. A multi-level liquid level control device for a sand well immersion test according to claim 2, characterized in that: Multiple groups of the liquid level probes are arranged at intervals along the height direction of the lower part of the water injection pipe (3). Each group of the liquid level probes includes a water replenishment probe (16) and a water stop probe (15) arranged on the water injection pipe (3). The water replenishment probe (16) is connected to the input end of the water replenishment probe grading controller (8), and the water stop probe (15) is connected to the input end of the water stop probe grading controller (7).

4. A multi-level liquid level control device for a sand well immersion test according to claim 1, characterized in that: The water storage bucket (2) is arranged at the top of the immersion exploration well (1), and the electromagnetic induction valve (4) is arranged on the pipe section of the water injection pipe (3) located at the top of the immersion exploration well (1).

5. A multi-level liquid level control device for a sand well immersion test according to claim 1, characterized in that: A gravel layer (1-1) and an excavated soil backfill layer (1-2) are arranged in the immersion exploration well (1) from bottom to top. The top height of the gravel layer (1-1) is higher than that of the uppermost liquid level probe.

6. A multi-level liquid level control device for a sand well immersion test according to claim 1, characterized in that: The liquid level probes and the ground wire probe (14) are installed on the outer side wall of the water injection pipe (3) through probe fixing parts (17). The probe fixing parts (17) include a square steel box (17-1) and an opening plate (17-2) arranged on the side of the square steel box (17-1) close to the water injection pipe (3). A receiving groove (17-4) is arranged on the outer side wall of the opening plate (17-2). A U-shaped pull ring (17-3) is arranged at the bottom of the receiving groove (17-4). A hoop (17-5) for clamping on the outer side wall of the water injection pipe (3) is arranged through the U-shaped pull ring (17-3). A punching hole (17-6) is arranged on the side wall of the square steel box (17-1).

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