Apparatus and method for embedding a confined aquifer in a similar simulation experiment

Abstract

The application provides a device and method for embedding confined aquifer in similar simulation experiment. The device for embedding confined aquifer in similar simulation experiment comprises a bearing system and a recharge and discharge system. The bearing system comprises a bearing frame with open ends and two water tanks installed on the inner wall of the bearing frame. Each of the two water tanks has a side of sand screen for blocking the aquifer medium from entering the water tank. The recharge and discharge system comprises a recharge system and a discharge system, both of which comprise a water tank and a variable frequency constant pressure water pump. The water tank is connected to the water tank through a water pipe, and a flow meter is arranged on the water pipe. Compared with the prior art, the device for embedding confined aquifer can embed the confined aquifer closer to the actual situation at each position of the rock layer in the similar experiment. The water pressure and water inflow and outflow of the corresponding water tank can be controlled through the variable frequency constant pressure water pump, the water tank and the flow meter, so as to control the side pressure head and recharge and discharge amount of the boundaries on both sides of the confined aquifer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of similar simulation experiment, in particular to a device and method for embedding a confined aquifer in a similar simulation experiment. BACKGROUND

[0002] Similar simulation experiment of rock strata plays a very important role in mineral exploitation, mine water resource protection and utilization. With the improvement of experimental conditions, similar experiment is more and more refined, large-scale and intelligent, and the similar simulation of confined aquifer is also required to be more complex and more realistic. However, the treatment of confined aquifer in the experiment is very simple at present. In the existing similar simulation experiment of rock strata, the water pressure and water volume of the confined aquifer cannot be controlled, and the recharge and discharge process cannot be formed. Even the stable side pressure head of the recharge boundary cannot be guaranteed, and the effect of simulating the real aquifer cannot be achieved.

[0003] In the paper "Research on Similar Material Simulation of Aquifer Structure Variation under Group Coal Mining Driving" by Li Minwei and Zhang Fawang, water and medium such as medium sand are mixed and filled directly to simulate the aquifer, which is realized by the size of water content ratio, so that liquid water is contained in the aquifer. In the simulation of coal mining process, the structure change of the aquifer can be observed. However, in this experiment, although water exists in the form of liquid in the water-containing medium, the pressure applied to the rock strata cannot be applied to the liquid water. When the rock strata collapse, the formation of phreatic surface in the aquifer is more similar to the phreatic aquifer.

[0004] In the paper "Experimental Study on Water Inrush and Sand Inrush under Coal Mining in Shallow Buried Thin Bedrock Aquifer" (Mining and Safety Engineering Journal, Vol. 34, No. 3) by Zhao Qifeng et al., a two-dimensional aquifer simulation device is designed. The device connects a nitrogen tank to a pressure water tank to pressurize the aquifer, so as to form a confined aquifer. In the experiment, the water runoff process can be observed through the water-resistant organic glass boundary. In the experiment, the confined pressure of the recharge section is realized, but the discharge boundary of the aquifer is lacking, and the complete groundwater runoff process cannot be formed. Moreover, the confined water head of the recharge section is uncontrollable when the rock strata change and groundwater infiltrates.

[0005] In the patent CN206710429U, a similar simulation experiment device suitable for simulating a confined aquifer is disclosed. A pressure water bag is embedded in the rock strata to simulate the confined aquifer, which solves the problem of constant pressure of the aquifer in the similar simulation dynamic experiment. Water flow circulation is realized through a water pump, inlet and outlet water pipes and a water tank. Although the experimental device realizes the pressure condition, the groundwater is not stored in the aquifer medium, which does not meet the conditions of most confined aquifers except a few karst areas. The use of pressure sleeping bag to simulate the aquifer can only simulate the confined aquifer and cannot be combined with the rock strata simulation. Moreover, the water in the aquifer is pipe flow rather than seepage, which is inconsistent with the actual situation. Although the device realizes the groundwater runoff process of the aquifer, the pressure heads of the recharge and discharge ends are uncontrollable. SUMMARY

[0006] In view of the above-mentioned deficiency that the water pressure and water volume of the confined aquifer in the similar simulation experiment cannot be controlled in the prior art, the present application aims to provide a device for embedding a confined aquifer in a similar simulation experiment, which can embed a confined aquifer in a similar simulation experiment and control the water pressure and water volume of the confined aquifer.

[0007] The present application provides a device for embedding a confined aquifer in a similar simulation experiment, characterized in that it comprises:

[0008] a bearing system comprising a bearing frame with open ends and a first water tank and a second water tank installed on the inner wall of the bearing frame, the inside of the bearing frame being used to fill aquifer medium to form an aquifer, the side of the first water tank and the second water tank away from the inner wall of the bearing frame being a sand screen, the sand screen being used to block the aquifer medium from entering the water tank and enable the water in the water tank to enter the aquifer, the sand screen on the first water tank being parallel to the sand screen on the second water tank;

[0009] a recharge and discharge system comprising a recharge system and a discharge system, both the recharge system and the discharge system comprising a water tank and a variable frequency constant pressure water pump providing constant water pressure for the water tank;

[0010] wherein the water tank in the recharge system is connected to the first water tank through a water pipe, and a flow meter is arranged on the water pipe; the water tank in the discharge system is connected to the second water tank through another water pipe, and a flow meter is arranged on the water pipe.

[0011] The aquifer medium is a similar material, which can be silt, fine sand, coarse sand or gravel. Preferably, the top and bottom of the two water tanks are spaced apart from the openings at both ends of the bearing frame.

[0012] Preferably, the inner wall of the bearing frame is provided with a frosted layer.

[0013] The inner wall of the entire bearing frame can be frosted to form a frosted layer, or only the part of the inner wall of the bearing frame in contact with the aquifer can be frosted to form a frosted layer on the inner wall of the bearing frame, so that the roughness profile unit of the frosted layer can reduce the permeability coefficient at the water-resisting boundary.

[0014] Preferably, the average width Rsm of the roughness profile unit of the frosted layer is equal to the particle size of the aquifer medium.

[0015] Preferably, the device further comprises a data monitoring system, which comprises a data processing device and a water pressure monitoring device, the water pressure monitoring device being buried in the aquifer to monitor the water pressure of the aquifer and transmit the water pressure data to the data processing device.

[0016] Preferably, the water pressure monitoring device is installed in a sand isolation frame, which is used to isolate the water pressure monitoring device from the aquifer medium and the pressure of the aquifer medium.

[0017] Preferably, the data monitoring device further comprises a water temperature monitoring device and / or a salinity monitoring device; the water temperature monitoring device is buried in the aquifer to monitor the water temperature of the aquifer and transmit the water temperature data to the data processing device; the salinity monitoring device is buried in the aquifer to monitor the salinity of the aquifer and transmit the salinity data to the data processing device.

[0018] The water temperature monitoring device and the salinity monitoring device can also be installed in a sand isolation frame to isolate the aquifer medium and the pressure of the aquifer medium.

[0019] Preferably, the data monitoring device further comprises an air pressure monitoring device for monitoring atmospheric pressure and transmitting atmospheric pressure data to the data processing device.

[0020] The present application also provides a method for embedding a confined aquifer in a similar simulation experiment, which embeds a confined aquifer in the rock stratum of a similar simulation experiment by using the device for embedding a confined aquifer as described above, comprising the following steps:

[0021] Step 1: Place the device for embedding a confined aquifer on the rock stratum in the similar simulation device, and fill the lower aquiclude in the bearing frame until the filling height reaches the bottom of the water tank;

[0022] Step 2: Fill the aquifer in the bearing frame to the height of the water tank, sprinkle water on the aquifer while filling, and inject water into the first water tank through the recharge system, and when the aquifer is filled, ensure that the aquifer is in a saturated state;

[0023] Step 3: Fill the upper aquiclude in the bearing frame;

[0024] Step 4: Continue to inject water into the first water tank through the recharge system, so that the amount of water flowing into the first water tank is the same as the amount of water flowing out of the second water tank, and at this time the aquifer is in a saturated state;

[0025] Step 5: Inject water into the second water tank through the drainage system, and set the pressure of the two variable frequency constant pressure water pumps in the recharge and drainage system to the pressure required by the similar simulation experiment;

[0026] Step 6: Fill the rock stratum in the similar simulation device, so that the rock stratum covers the upper aquiclude.

[0027] The aquifer medium used for filling the aquifer is similar material, which can be silt, fine sand, coarse sand or gravel; the filling material used for filling the upper and lower aquitard can be clay or concrete.

[0028] Preferably, the inner wall of the bearing frame and the lower aquitard are bonded with the water-proof adhesive, and the inner wall of the bearing frame and the upper aquitard are bonded with the water-proof adhesive.

[0029] Preferably, during the process of filling the aquifer, a water pressure monitoring device is buried in the aquifer, and the water pressure monitoring device is connected to a data processing device.

[0030] Compared with the prior art, the device for embedding a confined aquifer in a similar simulation experiment provided by the present application is a novel aquifer embedding device based on rock stratum simulation, which can embed a confined aquifer close to the actual situation at various positions in the rock stratum in a similar experiment and can be recycled. The device and method for embedding a confined aquifer in a similar simulation experiment provided by the present application can control the water pressure and water inflow and outflow of the corresponding water tank through a variable frequency constant pressure water pump, a water tank and a flowmeter, so as to control the side pressure head and recharge and discharge of the boundaries on both sides of the confined aquifer, thereby achieving: constant and same water head on both sides of the aquifer, static state of groundwater under pressure; constant but different water head on both sides of the aquifer, steady state of groundwater runoff under pressure difference; controlled recharge and discharge on both sides of the aquifer; and the state of groundwater seepage and fissure seepage can also be simulated by changing the upper and lower aquitards. The side pressure head, water temperature, salinity and recharge and discharge are monitored in real time by laying data monitoring equipment in the aquifer. Compared with the prior art, the simulated confined aquifer is closer to the actual situation and is more suitable for large-scale rock stratum simulation.

[0031] The above technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present application can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0032] The present application will be described in more detail in the following based on non-limiting examples and with reference to the drawings. In which:

[0033] Figure 1 The structure diagram of the device for embedding a confined aquifer in a similar simulation experiment provided by the present application;

[0034] Figure 2 The structure diagram of the device for embedding a confined aquifer in a similar simulation experiment provided by the present application; Figure 1 The enlarged view of I in the figure;

[0035] Figure 3 The side view of the rock stratum after embedding a confined aquifer in a similar simulation experiment.

[0036] Legend of reference signs:

[0037] 1, bearing frame; 2, first water tank; 2', second water tank; 3, sand screen; 4, water pressure monitoring device; 5, sand screen frame; 6, air pressure monitoring device; 7, data line outlet pipe; 8, flow meter; 9, pressure-bearing water pipe; 10, water tank; 11, data processing device; 12, variable frequency constant pressure water pump; 13, data line; 14, rock stratum; 15, lower aquiclude; 16, aquifer; 17, upper aquiclude. DETAILED DESCRIPTION

[0038] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below. Based on the specific embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0039] The terms "first", "second", and the like used in the present disclosure do not indicate any order, number or importance, but are only used to distinguish different parts. The terms "include" or "contain" and the like mean that the elements before the terms cover the elements listed after the terms, and do not exclude the possibility of also covering other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] Figure 1 The structure of the device for embedding the confined aquifer in the similar simulation experiment is schematically shown; Figure 2 For Figure 1 The enlarged view at I in the middle; Figure 3 The structure after embedding the confined aquifer in the similar simulation experiment rock stratum is schematically shown.

[0041] As Figure 1 , Figure 2 shown, the device for embedding the confined aquifer in the similar simulation experiment (hereinafter referred to as the device for embedding the confined aquifer) includes a bearing system and a recharge and discharge system. As Figure 3 shown, using the device for embedding the confined aquifer provided by the present application, the confined aquifer 16 can be embedded at any position in the rock stratum 14 of the similar simulation experiment. The bearing system is used to bear the aquifer 16 and the aquiclude. The recharge and discharge system is used to control the side pressure head of the boundaries on both sides of the confined aquifer 16 and the recharge and discharge amount, and by controlling the pressure head of the recharge and discharge boundaries of the aquifer 16, the runoff process completed by the groundwater is realized.

[0042] The bearing system comprises a bearing frame 1 which is a rectangular structure with two open ends and is surrounded by four side plates. The bearing frame 1 can support the aquifer 16, the aquiclude and part of the equipment. The structure with two open ends can make the aquifer 16 embedded in any position of the similar simulated rock stratum 14 and realize the real connection between the aquifer 16 and the rock stratum 14.

[0043] Two water tanks with the same size are respectively installed on the inner walls of the left and right sides of the bearing frame 1. The installation height of the two water tanks is the same, and the top and bottom of the two water tanks are respectively spaced from the openings at the two ends of the bearing frame 1, so as to fill the space at the bottom and top of the water tank to form the aquiclude. One side of each of the two water tanks is made of sand screen, which is used to block the aquifer medium from entering the water tank, and at the same time, the water in the water tank can pass through the sand screen into the aquifer 16. By arranging two water tanks, controllable pressure can be provided for the aquifer 16. In order to distinguish and describe conveniently, the water tank arranged on the left side of the bearing frame 1 is referred to as the first water tank 2, and the right side of the first water tank 2 is the sand screen 3. The water tank arranged on the right side of the bearing frame 1 is referred to as the second water tank 2', and the left side of the second water tank 2' is the sand screen 3. The sand screen 3 on the first water tank 2 is parallel to the sand screen 3 on the second water tank 2'. The space in the bearing frame 1 at the bottom of the water tank is used to fill the aquiclude filling material to form the lower aquiclude 15. The space in the bearing frame 1 between the two sand screens 3 is used to fill the aquifer medium to form the aquifer 16. The space in the bearing frame 1 at the top of the water tank is used to fill the aquiclude filling material to form the upper aquiclude 17. Preferably, the aquiclude filling material and the inner wall of the bearing frame 1 in contact with the aquiclude are bonded by aquiclude adhesive to ensure that the intermediate aquifer 16 bears pressure. By arranging two water tanks on the left and right inner walls of the bearing frame 1, the sand screens 3 on the two sides of the water tanks are parallel to each other, which realizes the same vertical pressure of the recharge and discharge boundary of the aquifer 16, and makes the water uniformly infiltrate and flow out in the aquifer 16.

[0044] In some embodiments, the part of the inner wall of the bearing frame 1 in contact with the aquifer 16 is subjected to sanding treatment, so as to form a sanding layer on the inner wall of the bearing frame 1. By arranging the sanding layer, the contact area between the aquifer medium and the inner wall of the bearing frame 1 is increased, and the permeability coefficient at the aquiclude boundary is reduced. However, the problem of too large permeability coefficient at the aquiclude boundary is often ignored in the prior art. Preferably, the average width Rsm of the roughness profile unit of the sanding layer is equal to the particle size of the aquifer medium, so that the permeability coefficient at the aquiclude boundary is consistent with the internal permeability coefficient of the aquifer 16.

[0045] The recharge and discharge system comprises a recharge system and a discharge system. Both the recharge system and the discharge system comprise a water tank 10, a variable frequency constant pressure water pump 12 and a flow meter 13. The water tank 10 is connected to the water tank through a water pipe, and the flow meter 13 is arranged on the water pipe to monitor the flow of water in the water pipe. The water tank 10 can be a common water tank, and the capacity thereof meets the water amount flow of the recharge or discharge of the aquifer during the simulation of the runoff process. The variable frequency constant pressure water pump 12 can provide constant water pressure to the water tank 10, and the water tank 10 can provide sufficient water amount for the recharge and discharge of the confined aquifer 16. The flow meter 13 records the water amount of the confined aquifer 16, and the water tank ensures the constant water pressure at the boundary of the confined aquifer 16. Specifically, the water tank 10 in the recharge system is connected to the first water tank 2 through a water pipe, and the water tank 10 in the discharge system is connected to the second water tank 2' through another water pipe. In order to improve the reliability of the device, the water pipe is preferably a pressure-bearing water pipe 9. The water pressure of the corresponding water tank can be controlled through the variable frequency constant pressure water pump 12 and the water tank 10, so as to control the side pressure head of the boundaries on both sides of the confined aquifer 16, ensure that the side pressure head at the boundary of the confined aquifer 16 is real-time constant and controllable, and then realize the simulation of the groundwater runoff process of the confined aquifer 16, thereby solving the problem that the initial pressure value of the aquifer in the prior art cannot be controlled in real time. Compared with the prior art, the confined aquifer 16 established by the device is closer to the actual situation.

[0046] The water pressure and water amount of the corresponding water tank can be controlled through the variable frequency constant pressure water pump 12, the water tank 10 and the flow meter 13, so as to control the side pressure head of the boundaries on both sides of the confined aquifer 16 and the recharge and discharge amount, and then realize that the water heads on both sides of the confined aquifer 16 are constant and the same, the groundwater is in a static state; the water heads on both sides of the confined aquifer 16 are constant but not equal, and the groundwater is in a runoff state under a stable pressure difference; the recharge and discharge amounts of the confined aquifer 16 are controlled; and the states of groundwater leakage and fissure seepage can also be simulated under the condition that the upper and lower aquitards 17 and 15 are changed.

[0047] In some embodiments, the device embedded in the confined aquifer further comprises a data monitoring system. The data monitoring system comprises a data processing device 11 and a data monitoring device. The data processing device 11 is used to save and process data, such as a computer, a mobile phone and the like. The data monitoring device at least comprises a water pressure monitoring device 4 for monitoring the water pressure of the confined aquifer 16. A plurality of water pressure monitoring devices 4 are buried in the confined aquifer 16 to monitor the water pressure in the confined aquifer 16. After the water pressure monitoring device 4 obtains the water pressure data, the data is transmitted to the data processing device 11 for saving and processing.

[0048] In some embodiments, the water pressure monitoring device 4 is installed in the sand isolation frame 5, so that the water pressure monitoring device 4 is isolated from the aquifer medium, while water can pass through the sand isolation frame, thereby excluding the interference of the aquifer medium pressure on the water pressure detection device, and ensuring that the water pressure monitoring device 4 accurately monitors the water pressure of the confined aquifer 16.

[0049] In some embodiments, the data monitoring device comprises a gas pressure monitoring device 6 in addition to the water pressure monitoring device 4. The gas pressure monitoring device 6 is used to monitor the atmospheric pressure and transmit the atmospheric pressure data to the data processing device 11. By monitoring the atmospheric pressure, the influence of the atmospheric pressure can be excluded, the water pressure data of the aquifer 16 can be calculated more accurately, and the error in monitoring the lateral water head can be reduced.

[0050] In order to monitor the water temperature and / or the salinity of the aquifer while monitoring the water pressure of the aquifer, the data monitoring device comprises a water temperature monitoring device and / or a salinity monitoring device in addition to the water pressure monitoring device 4. A plurality of water temperature monitoring devices and / or salinity monitoring devices are buried in the aquifer 16 to monitor the water temperature and / or the salinity in the aquifer 16, and after obtaining the water temperature and / or salinity data, the data are transmitted to the data processing device 11 for storage and processing. These water temperature monitoring devices and / or salinity monitoring devices can also be arranged in the sand exclusion frame.

[0051] In order to monitor the water temperature and / or the salinity of the aquifer while monitoring the water pressure of the aquifer, in addition to the above-mentioned water temperature monitoring device and / or salinity monitoring device, a monitoring device with the functions of monitoring water pressure, water temperature and salinity can also be selected. In some embodiments, the water pressure monitoring device 4 is a minDiver water pressure monitor with a sand exclusion frame 5. The minDiver water pressure monitor can not only monitor the water pressure, but also monitor the water temperature and salinity at the same time, and also avoids the water head loss caused by the water entering the rock layer 14. The gas pressure monitoring device 6 is a BaroDiver gas pressure monitor. The atmospheric pressure is monitored in real time by the BaroDiver gas pressure monitor, and the error in monitoring the lateral water head is reduced.

[0052] The sand exclusion frame 5 and the sand exclusion net 3 can be made of a metal mesh. The mesh size of the sand exclusion net 3 and the sand exclusion frame can be determined according to the size of the medium particles in the aquifer (such as particle size). The mesh size is required to be smaller than the particle size of the medium in the aquifer, so that water can pass through but the medium in the aquifer cannot pass through.

[0053] The flow meter 13, the water pressure monitoring device 4 and the gas pressure monitoring device 6 in the present application can be connected to the data processing device 11 through data lines 13 (as shown in Figure 1 In addition, wireless transmission modules can also be arranged in the flow meter 13, the water pressure monitoring device 4 and the gas pressure monitoring device 6, and wireless receiving modules are arranged in the data processing device 11, and the wireless transmission modules and the wireless receiving modules are wirelessly connected to transmit the monitoring data.

[0054] The device for embedding confined aquifer provided by the present application can embed the confined aquifer 16 at any position in the rock stratum 14 of the similar simulation experiment. Figure 1 The method for embedding the confined aquifer 16 in the similar simulation experiment provided by the device for embedding confined aquifer comprises the following steps:

[0055] Step 1: Place the device for embedding confined aquifer on the filled rock stratum 14 in the similar simulation device and fix it, fill the lower aquiclude 15 in the bearing frame 1 until the filling height reaches the bottom of the water tank;

[0056] In order to ensure the pressure bearing of the aquifer 16, it is preferred to use water-proof adhesive between the lower aquiclude 15 and the inner wall of the bearing frame 1 in contact with the lower aquiclude 15;

[0057] Step 2: Fill the aquifer 16 in the bearing frame 1 above the lower aquiclude 15, and the filling thickness of the aquifer 16 is the height of the water tank; During the filling of the aquifer 16, the water pressure monitoring device 4 is buried, and the water pressure monitoring device 4 is connected to the data processing device 11; At the same time of filling, water is sprayed on the aquifer 16, and water is injected into the first water tank 2 through the recharge system, and when the aquifer 16 is filled, it is ensured that the aquifer 16 is in a saturated state;

[0058] Step 3: Fill the upper aquiclude 17 in the bearing frame 1 above the aquifer 16;

[0059] In order to ensure the pressure bearing of the aquifer 16, it is preferred to use water-proof adhesive between the upper aquiclude 17 and the inner wall of the bearing frame 1 in contact with the upper aquiclude 17;

[0060] Step 4: Continue to inject water into the first water tank 2 through the recharge system, so that the amount of water flowing into the first water tank 2 is the same as the amount of water flowing out of the second water tank 2', at this time the aquifer 16 is in a saturated state;

[0061] Step 5: Inject water into the second water tank 2' through the drainage system, and set the pressure of the two variable frequency constant pressure water pumps 12 in the recharge and drainage system to the pressure required by the similar simulation experiment;

[0062] Step 6: Fill the rock stratum 14 in the similar simulation device, so that the rock stratum 14 covers the upper aquiclude 17.

[0063] If the experiment is set to have the aquifer 16 below the rock stratum 14, in step 1, the bearing frame 1 can be placed at the bottom end of the rock stratum 14.

[0064] After the above steps are completed, the confined aquifer 16 is embedded in the rock stratum 14 of the similar simulation experiment. As shown in Figure 3As shown, the embedding confined aquifer 16 device embeds the lower aquifuge 15, the aquifer 16 and the upper aquifuge 17 into the rock stratum 14 as a whole, so that the aquifer 16 has stable hydrogeological conditions of the confined and lateral water head, and a stable recharge-drainage flow system is formed in the aquifer 16.

[0065] The aquifuge filling material and the aquifer medium, the monitoring device 4 installation density and position, the monitoring time interval, the water tank 10 pressure value, and the physical and chemical characteristics of the water used in the aquifer 16 can be determined according to specific experiments.

[0066] In the similar simulation experiment, by increasing the pressure of the two water tanks 10, the lateral water head of the confined aquifer 16 is raised, and then the confined water penetrates into other rock strata 14 through the aquifuge, causing groundwater seepage.

[0067] By physically damaging the lower rock stratum 14 or the upper and lower aquifuges to form fissures, the seepage of the confined water in the fissures is simulated.

[0068] Finally, it should be noted that: the above implementation and examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments or replace some technical features with equivalent ones; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments or examples of the present application.

Claims

1. An apparatus for embedding a confined aquifer in a similar analog experiment, characterized in that, The device comprises: a bearing system comprising a bearing frame with two open ends and a first water tank and a second water tank installed on the inner wall of the bearing frame, the inside of the bearing frame being used to fill aquifer medium to form an aquifer, the side of the first water tank and the second water tank facing away from the inner wall of the bearing frame being a sand screen, the sand screen being used to block the aquifer medium from entering the water tank and enable the water in the water tank to enter the aquifer, the sand screen on the first water tank being parallel to the sand screen on the second water tank; a recharge and drainage system comprising a recharge system and a drainage system, the recharge system and the drainage system each comprising a water tank and a variable frequency constant pressure water pump providing constant water pressure for the water tank; wherein the water tank in the recharge system is connected to the first water tank through a water pipe, and a flow meter is arranged on the water pipe; the water tank in the drainage system is connected to the second water tank through another water pipe, and a flow meter is arranged on the water pipe; the inner wall of the bearing frame is provided with a frosted layer to increase the contact area of the aquifer medium and the inner wall of the bearing frame; the average width Rsm of the roughness profile unit of the frosted layer is equal to the particle size of the aquifer medium.

2. The apparatus for embedding an aquifer under pressure in a similar simulation experiment according to claim 1, characterized in that, The top and bottom of the two water tanks are spaced apart from the openings at the two ends of the bearing frame.

3. The apparatus for embedding an aquifer under pressure in a similar simulation experiment according to claim 1, characterized in that, It also comprises a data monitoring system, which comprises a data processing device and a water pressure monitoring device, the water pressure monitoring device being buried in the aquifer to monitor the water pressure of the aquifer and transmit the water pressure data to the data processing device.

4. The apparatus for embedding an aquifer under pressure in a similar simulation experiment according to claim 3, characterized in that, The water pressure monitoring device is installed in a sand screen frame, which is used to isolate the water pressure monitoring device from the aquifer medium and the pressure of the aquifer medium.

5. The apparatus for embedding an aquifer under pressure in a similar analog experiment according to claim 3, characterized in that, The data monitoring device further comprises a water temperature monitoring device and / or a salinity monitoring device; the water temperature monitoring device is buried in the aquifer to monitor the water temperature of the aquifer and transmit the water temperature data to the data processing device; the salinity monitoring device is buried in the aquifer to monitor the salinity of the aquifer and transmit the salinity data to the data processing device.

6. The apparatus for embedding an aquifer under pressure in a similar simulation experiment according to claim 3, characterized in that, The data monitoring device further comprises an air pressure monitoring device for monitoring atmospheric pressure and transmitting atmospheric pressure data to the data processing device.

7. A method of embedding a confined aquifer in a similar simulation experiment, characterized in that, The device for embedding in a confined aquifer according to any one of claims 1-6 is embedded in a rock layer in a similar simulation experiment, comprising the following steps: Step 1: Place the device for embedding in a confined aquifer on the rock layer in the similar experimental device, and fill the lower aquitard in the bearing frame until the filling height reaches the bottom of the water tank; Step 2: Fill the aquifer in the bearing frame to the height of the water tank, sprinkle water on the aquifer while filling, and inject water into the first water tank through the recharge system, and ensure that the aquifer is in a saturated state when the aquifer is filled; Step 3: Fill the upper aquitard in the bearing frame; Step 4: Continue to inject water into the first water tank through the recharge system, so that the amount of water flowing into the first water tank is the same as the amount of water flowing out of the second water tank, and at this time the aquifer is in a saturated state; Step 5: water is injected into the second water tank through the drainage system, and the pressure of the two variable frequency constant pressure water pumps in the recharge drainage system is set to the pressure required by the similar simulation experiment; Step 6: rock layer filling is carried out in the similar experimental device, so that the rock layer covers the upper aquiclude.

8. The method of embedding an aquifer under pressure in a similar analog experiment of claim 7, wherein, The inner wall of the bearing frame and the lower aquiclude, and the inner wall of the bearing frame and the upper aquiclude are bonded with water-proof adhesive.

9. The method of embedding a confined aquifer in a similar analogue experiment according to claim 7 or 8, characterized in that, During the process of aquifer filling, a water pressure monitoring device is buried in the aquifer, and the water pressure monitoring device is connected to a data processing device.

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