In-situ testing system and method for water storage coefficient of underground water reservoir in coal mine

Abstract

The present invention provides an in-situ testing system and method for the water storage coefficient of a coal mine underground reservoir. The testing system comprises: a water inlet system, the water inlet system comprising a temporary water tank disposed on a high-level working surface; a water storage system, the water storage system comprising a reservoir, the reservoir being composed of a goaf, a coal pillar dam, and an artificial dam on a low-level working surface, the artificial dam being provided with a water outflow monitor and a water level monitor corresponding to the reservoir; wherein the temporary water tank is connected to the reservoir via a water delivery structure constructed from the high-level working surface to the low-level working surface, the water delivery structure being provided with a water inflow monitor. Based on the technical solution of the present invention, the water storage coefficient is calculated by real-time measurement of the water inflow, water outflow, and water level of the coal mine underground reservoir, taking into account the spatial and temporal effects of the compaction of the overlying strata, thereby truly reflecting the water storage capacity of the coal mine underground reservoir.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine underground water reservoirs, and in particular to an in-situ testing system and method for the water storage coefficient of a coal mine underground water reservoir. Background Art

[0002] The western region boasts vast coal reserves, shallow coal seams, and relatively simple geological and hydrological conditions. This has led to the development of modern fully mechanized coal mining technology, characterized by safety, efficiency, and high recovery rates, providing a crucial guarantee for my country's coal supply. Currently, western mining areas are developing and gradually promoting the use of distributed underground reservoirs in coal mines to address water shortages and uneven water use in these areas. This technology provides a crucial guarantee for water-saving coal mining, reducing mine wastewater discharge, and ensuring sufficient water for daily use.

[0003] Research on the water storage coefficient of coal mine underground reservoirs is not only the basis for determining storage capacity but also a key issue that needs to be addressed within the theoretical framework of coal mine underground reservoirs. Given that most current coal mine underground reservoir water storage coefficients are determined empirically, resulting in significant uncertainty and failing to consider the impact of timeliness, accurate, real-time, dynamic, and accurate determination of the water storage coefficient through in-situ testing is crucial for the operation of coal mine underground reservoir water resource systems. Summary of the Invention

[0004] In response to the above-mentioned problems in the existing technology, this application proposes an in-situ testing system and method for the water storage coefficient of a coal mine underground water reservoir. The water storage coefficient is obtained by calculating the water inflow, water outflow and water level of the coal mine underground water reservoir in real time, taking into account the spatial and temporal effects of the compaction of the overlying rock strata, thereby truly reflecting the water storage capacity of the coal mine underground water reservoir.

[0005] The in-situ testing system for the water storage coefficient of a coal mine underground reservoir of the present invention comprises:

[0006] A water inlet system, comprising a temporary water tank provided on the high working surface;

[0007] A water storage system, comprising a reservoir, the reservoir being composed of a goaf on a low-level working face, a coal pillar dam, and an artificial dam, the artificial dam being provided with a water outflow monitor and a water level monitor corresponding to the reservoir;

[0008] The temporary water tank is connected to the reservoir via a water delivery structure constructed from the high-level working surface to the low-level working surface, and a water inlet flow monitor is provided on the water delivery structure.

[0009] In one embodiment, the water delivery structure comprises:

[0010] a water inlet channel, the water inlet channel being constructed in the stratum between the high-level working surface and the low-level working surface and connecting the temporary water tank and the reservoir;

[0011] a water inlet pipe extending from the interior of the temporary water tank to the upper half of the water inlet channel;

[0012] Wherein, the water inlet flow monitor is arranged on the water inlet pipe.

[0013] In one embodiment, the water inlet system further comprises a water-passing, air-blocking tunnel constructed on the lower working surface, one end of which is connected to the reservoir and the other end of which corresponds to the water outlet at the bottom of the water delivery structure. In this embodiment, the water-passing, air-blocking tunnel is disposed between the reservoir and the water delivery structure, providing a buffer for water inflow while also preventing harmful gases from the lower working surface and reservoir from entering the higher working surface through the water delivery structure.

[0014] In one embodiment, a recess and a protrusion are provided on the top plate of the water-passing and air-blocking tunnel, wherein the recess is located on a side of the protrusion close to the reservoir, and the lengths of the recess and the protrusion in the width direction of the water-passing and air-blocking tunnel are both equal to the width of the water-passing and air-blocking tunnel, and a retaining wall is provided in the water-passing and air-blocking tunnel directly below the recess;

[0015] Among them, the top height of the water retaining wall is higher than the height of the top plate of the water-passing and air-blocking tunnel and is lower than the height of the highest point of the depression.

[0016] Through this embodiment, the depression, protrusion and water retaining wall together form the air-tight structure in the water-through and air-tight tunnel, preventing toxic and harmful gases in the reservoir from entering the high-level working face along the water-through and air-tight tunnel.

[0017] In one embodiment, the water inlet channel is a tubular structure with a straight axis, and the angle between the axis of the water inlet channel and the horizontal plane is acute. This embodiment facilitates direct drilling of the tubular structure into the stratum. The acute angle between the axis of the water inlet channel and the horizontal plane prevents the water inlet channel from being perpendicular to the horizontal plane, thereby preventing excessive impact caused by vertical water flow.

[0018] In one embodiment, a drainage pipe and a water level monitoring pipe connected to the reservoir are respectively provided on the artificial dam body near the bottom of the reservoir, and valves are provided on the drainage pipe and the water level monitoring pipe.

[0019] Wherein, the water flow monitor and the water level monitor are respectively arranged on the drainage pipe and the water level monitoring pipe.

[0020] In one embodiment, a wire mesh is provided on the outlet of the drainage pipe and the water level monitoring pipe at one end inside the reservoir. In this embodiment, the wire mesh is used to prevent the waste rock sludge in the reservoir from clogging the pipe.

[0021] In one embodiment, the drainage pipe and the water level monitoring pipe are provided with a plurality of permeable holes on the wall of one end of the pipe located inside the reservoir. This embodiment not only prevents gangue and sludge from entering the pipes and clogging them, but also provides a flow path for water, ensuring that the water flow in the drainage pipe and the water level monitoring pipe is not too low.

[0022] In one embodiment, a waterproof layer composed of mortar is provided between the inner wall of the water inlet channel and the outer wall of the water inlet pipe. With this embodiment, the waterproof layer can seal the gap between the water inlet channel and the water inlet pipe, preventing water from flowing through the gap and affecting the accuracy of the water inlet flow monitor.

[0023] The present invention provides an in-situ testing method for the water storage coefficient of a coal mine underground reservoir, which is applied to the above-mentioned in-situ testing system. The method comprises:

[0024] Step a: Obtain the flow rate Q of water flowing into the reservoir through the water inlet flow monitor of the water inlet pipe in , the flow rate Q of water discharged from the reservoir is obtained through the water flow monitor of the drainage pipe out , obtaining the current water level height h of the reservoir through the water level monitor of the water level monitoring pipe;

[0025] Step b: Calculate the water storage coefficient of the reservoir according to the following formula:

[0026] R h =(Q in -Q out ) / V h

[0027] V h =(S×h)

[0028] Among them, R h is the water storage coefficient, V h is the spatial volume of the reservoir when the water level is h, and S is the reservoir area.

[0029] 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 invention can be achieved.

[0030] The in-situ testing system and method for the water storage coefficient of underground water reservoirs in coal mines provided by the present invention have at least the following beneficial effects compared with the prior art:

[0031] The in-situ testing system and method of the water storage coefficient of a coal mine underground water reservoir of the present invention calculates the water storage coefficient by measuring the water inflow, water outflow and water level of the coal mine underground water reservoir in real time, taking into account the spatial and temporal effects of the compaction of the overlying rock strata, thereby truly reflecting the water storage capacity of the coal mine underground water reservoir, providing reference data for engineering practice and theoretical verification, and thus providing a better basis for the protection and utilization of mine water resources.

[0032] At the same time, the present invention proposes a structural design of a water-passing and air-blocking tunnel, which not only saves the laying of water pipelines, but also effectively prevents harmful gases in the low-level working face and the reservoir from flowing into the high-level working face. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0034] Figure 1 Shows the overall structural schematic diagram of the test system of the present invention;

[0035] Figure 2 Shows Figure 1 Schematic diagram of the structure of the AA section;

[0036] Figure 3 Shows Figure 1 Schematic diagram of the structure of the BB section.

[0037] In the drawings, like reference numerals are used for like parts, but the drawings are not necessarily true to scale.

[0038] Reference numerals:

[0039] 1-high-level working face, 2-low-level working face, 3-water inlet system, 31-temporary water tank, 32-water delivery structure, 321-water inlet channel, 322-water inlet pipe, 323-waterproof layer, 33-water inlet flow monitor, 34-water-passing and air-sealing tunnel, 341-depression, 342-convexity, 343-retaining wall, 4-water storage system, 41-reservoir, 42-coal pillar dam, 43-artificial dam, 44-water outlet flow monitor, 45-water level monitor, 5-drainage pipe, 51-pressure monitor, 6-water level monitoring pipe, 7-wire filter, 8-water permeable hole. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to the accompanying drawings.

[0041] The present invention provides an in-situ testing system for the water storage coefficient of a coal mine underground reservoir, comprising:

[0042] The water inlet system 3 includes a temporary water tank 31 provided on the high-level working surface 1;

[0043] Water storage system 4, which includes a reservoir 41. The reservoir 41 is composed of the goaf on the low-level working face 2, a coal pillar dam 42, and an artificial dam 43. The artificial dam 43 is provided with a water flow monitor 44 and a water level monitor 45 corresponding to the reservoir 41;

[0044] The temporary water tank 31 is connected to the reservoir 41 through a water delivery structure 32 constructed from the high-level working surface 1 to the low-level working surface 2 , and a water inlet flow monitor 33 is provided on the water delivery structure 32 .

[0045] Specifically, as shown in the accompanying drawings Figure 1 As shown, the stratum has a low-level working face 2 and a high-level working face 1 formed by coal mining operations. A temporary water tank 31 from the water inlet system 3 is installed on the high-level working face 1; a reservoir 41 from the water storage system 4 is installed on the low-level working face 2. The internal space of the reservoir 41 is the goaf on the low-level working face 2, and the coal pillar dam 42 and the artificial dam 43 constitute the dam body of one side of the reservoir 41. The temporary water tank 31 is connected to the reservoir 41 through a water delivery structure 32, and water is injected into the reservoir 41 through the water delivery structure 32. Based on the structure of the test system, an inlet flow monitor 33 is installed on the water delivery structure 32, and an outlet flow monitor 44 and a water level monitor 45 are installed on the artificial dam 43 of the reservoir 41 to respectively obtain the inlet flow, outlet flow and water level, so that the water storage coefficient of the reservoir 41 can be calculated by the company.

[0046] In one embodiment, the water delivery structure 32 includes:

[0047] The water inlet channel 321 is constructed in the stratum between the high-level working face 1 and the low-level working face 2 and connects the temporary water tank 31 and the reservoir 41;

[0048] A water inlet pipe 322 extends from the interior of the temporary water tank 31 to the upper portion of the water inlet channel 321;

[0049] The water inlet flow monitor 33 is disposed on the water inlet pipe 322 .

[0050] Specifically, as shown in the accompanying drawings Figure 1 As shown, the water inlet channel 321 is the main structure of the water delivery structure 32. One end of the water inlet pipe 322 is located in the temporary water tank 31, and the other end passes through the temporary water tank 31 and into the water inlet channel 321. Water in the temporary water tank 31 enters the water inlet channel 321 through the water inlet pipe 322 and ultimately flows into the reservoir 41. The water inlet pipe 322 is equipped with a valve to control the water delivery structure 32. The water inlet flow monitor 33 on the water inlet pipe 322 monitors the amount of water flowing from the temporary water tank 31 into the reservoir 41 in real time.

[0051] Preferably, a waterproof layer 323 is provided between the inner wall of the water inlet channel 321 and the outer wall of the water inlet pipe 322 , and the waterproof layer 323 is made of mortar.

[0052] Specifically, mortar is poured into the gap between the water inlet channel and the water inlet pipe and forms a waterproof layer after solidification. The waterproof layer can seal the gap between the water inlet channel and the water inlet pipe, preventing water from flowing through the gap and affecting the accuracy of monitoring by the water inlet flow monitor.

[0053] In one embodiment, the water inlet system 3 further comprises:

[0054] The water-passing and air-blocking tunnel 34 is constructed on the low-level working surface 2 , one end of the water-passing and air-blocking tunnel 34 is connected to the reservoir 41 , and the other end corresponds to the water outlet at the bottom of the water delivery structure 32 .

[0055] Specifically, the water-passing and air-blocking tunnel 34 is arranged between the reservoir 41 and the water supply structure 32 to provide a buffering effect for water inflow, while also preventing harmful gases in the low-level working face 2 and the reservoir 41 from entering the high-level working face 1 through the water supply structure 32.

[0056] Preferably, the height of the bottom of the water-passing and air-blocking tunnel 34 is higher than the height of the bottom of the reservoir 41 .

[0057] In one embodiment, a recess 341 and a protrusion 342 are provided on the top plate of the water-passing and air-blocking tunnel 34. The recess 341 is located on the side of the protrusion 342 close to the reservoir 41. The lengths of the recess 341 and the protrusion 342 in the width direction of the water-passing and air-blocking tunnel 34 are both equal to the width of the water-passing and air-blocking tunnel 34. A water retaining wall 343 is provided in the water-passing and air-blocking tunnel 34 directly below the recess 341.

[0058] The top height of the water retaining wall 343 is higher than the top plate of the water-passing and air-blocking tunnel 34 and is lower than the highest point height of the depression 341 .

[0059] Specifically, the depression 341, the protrusion 342 and the water retaining wall 343 together form the air-tight structure in the water-through air-tight tunnel 34. Figure 3 As shown, the principle of the air-tightening structure is that during the initial water supply, water flows through the water inlet channel 321 in the water supply structure 32 and enters the water-passing and air-tightening tunnel 34. However, the water flow is blocked by the water retaining wall 343 and cannot flow directly into the reservoir 41. Consequently, the water level in the water-passing and air-tightening tunnel 34 gradually rises and rises above the protrusion 342. Finally, when the water level is higher than the top of the water retaining wall 343, the water flows over the water retaining wall 343 and flows along the water-passing and air-tightening tunnel 34 into the reservoir 41. Thereafter, the water-passing and air-tightening tunnel 34 on the side of the water supply structure 32 near the protrusion 342 is filled with water. The protrusion 342 blocks the flow of gas from the water-passing and air-tightening tunnel 34 into the water supply structure 32, thereby achieving the effect of passing water and sealing air.

[0060] In one embodiment, the water inlet channel 321 is a tubular structure with a straight axis, and the angle between the axis of the water inlet channel 321 and the horizontal plane is an acute angle.

[0061] Specifically, as shown in the accompanying drawings Figure 1 As shown, the tubular structure of the water inlet channel 321 is convenient for drilling directly into the stratum; the angle between the axis of the water inlet channel 321 and the horizontal plane is acute, so that the water inlet channel 321 is not perpendicular to the horizontal plane, thereby avoiding excessive impact caused by the vertical flow of water.

[0062] In one embodiment, a drainage pipe 5 and a water level monitoring pipe 6 are respectively provided on the artificial dam body 43 near the bottom of the reservoir 41, both of which are connected to the reservoir 41. Valves are provided on the drainage pipe 5 and the water level monitoring pipe 6.

[0063] The water flow rate monitor 44 and the water level monitor 45 are respectively installed on the drainage pipe 5 and the water level monitoring pipe 6 .

[0064] Specifically, as shown in the accompanying drawings Figure 2 As shown, both the drainage pipe 5 and the water level monitoring pipe 6 are located near the bottom of the reservoir 41. The drainage pipe 5 is used to drain water during use, and the water flow rate monitor 44 detects the amount of water discharged. The water level monitor 45 on the water level monitoring pipe 6 detects the water level based on the relationship between water pressure and water level. The drainage pipe 5 is also equipped with a pressure monitor 51 for real-time monitoring of water pressure.

[0065] In one embodiment, a wire filter 7 is provided on the pipe openings of the drainage pipe 5 and the water level monitoring pipe 6 at one end located inside the reservoir 41 .

[0066] Specifically, the wire mesh filter 7 is used to prevent the gangue sludge in the reservoir 41 from clogging the pipeline.

[0067] Preferably, a plurality of water-permeable holes 8 are provided on the pipe wall of one end of the drainage pipe 5 and the water level monitoring pipe 6 located inside the reservoir 41 .

[0068] Specifically, the water-permeable holes 8 can prevent gangue sludge from entering the pipeline and clogging the pipeline, and further provide a flow path for water flow, ensuring that the water flow in the drainage pipe 5 and the water level monitoring pipe 6 is not too small.

[0069] The construction method of the test system of the present invention is:

[0070] Step 1: Select a reasonable location on the low-level working face 2 to excavate a water-permeable and air-tight tunnel 34;

[0071] Specifically, when excavating the water-passing and air-blocking tunnel 34, it is necessary to construct a highest point on the roof and a lowest point on the roof, that is, it is necessary to construct a depression 341 and a protrusion 342 on the roof of the water-passing and air-blocking tunnel 34 to ensure that there is a certain height difference between the two roofs, and to construct a water retaining wall 343 in the area of ​​the highest point of the roof, with a water-passing section left at the top of the wall from the highest point of the roof. For example: the elevation difference between the highest point on the roof of the water-passing and air-blocking tunnel 34 and the lowest point on the roof is 2.0m. A water retaining wall 343 is constructed at the highest point of the tunnel roof, and the height of the water retaining wall 343 is 1.0m higher than the lowest point of the tunnel roof, and a water-passing height of 1.0m is left at the tunnel from the highest point of the roof. In this way, the water in the water-through and air-tight tunnel 34 can flow over the retaining wall 343 into the reservoir 41, and since the water in the water-through and air-tight tunnel 34 has been capped, the toxic and harmful gases in the reservoir 41 will not enter the high-level working face 1 along the water-through and air-tight tunnel 34.

[0072] Step 2: construct an artificial dam body 43 based on the goaf (including collapsed rock mass) and coal pillar dam body 42 after mining of the low-level working face 2 to form a reservoir 41 together.

[0073] Step 3: Install the water level monitoring pipe 6 and the drainage pipe 5 near the bottom plate of the artificial dam body 43;

[0074] Specifically, before installation, both the water level monitoring pipe 6 and the drainage pipe 5 must have a permeable hole 8 at the end extending into the reservoir 41. A wire mesh 7 must be wrapped around the pipe opening to prevent clogging by waste rock and mud. The drainage pipe 5 is DN200 in diameter, and a pressure monitor 51, an outlet valve, and an outlet flow monitor 44 are installed, sequentially from the artificial dam body 43 outward. The water level monitoring pipe 6 is DN15 in diameter, and a water level monitor 45 and a control valve are installed, sequentially from the artificial dam body 43 outward.

[0075] Step 4: construct a temporary water tank 31 at a lower elevation in the mining tunnel of the high-level working face 1 according to the contour elevation, as a temporary water storage location for the high-level working face 1.

[0076] Step 5: Drill a water inlet channel 321 at a certain angle from the temporary water tank 31 and connect it to the water-passing and air-blocking tunnel 34. Install a water inlet pipe 322 in the upper area of ​​the temporary water tank 31 and the water inlet channel 321. Install a water inlet valve and a water inlet flow monitor 33 on the water inlet pipe 322.

[0077] Step 6: Use mortar to seal the gap between the water inlet pipe 322 and the water inlet channel 321 to prevent water from flowing from the gap between the water inlet channel 321 and the water inlet pipe 322 to the water-passing and air-blocking tunnel 34 .

[0078] The present invention also provides an in-situ testing method for the water storage coefficient of a coal mine underground reservoir, which is applied to the above-mentioned in-situ testing system. The method comprises:

[0079] Step a: Obtain the flow rate Q of water flowing into the reservoir through the water inlet flow monitor of the water inlet pipe in , the flow rate Q of water discharged from the reservoir is obtained through the water flow monitor of the drainage pipe out , obtaining the current water level height h of the reservoir through the water level monitor of the water level monitoring pipe;

[0080] Step b: Calculate the water storage coefficient of the reservoir according to the following formula:

[0081] R h =(Q in -Q out ) / V h

[0082] V h =(S×h)

[0083] Among them, R h is the water storage coefficient, V h is the spatial volume of the reservoir when the water level is h, and S is the reservoir area.

[0084] Specifically, the reservoir area S is measured in advance during coal mining, for example, the mining area S = 300m × 1000m; the corresponding parameters are obtained through the corresponding detector, such as the flow rate Q of the water flowing into the reservoir. in =70000m 3 , the flow rate of water discharged from the reservoir Q out =10000m 3 , water level height h = 1m; then the reservoir storage coefficient R can be calculated by the above formula h =(Q in -Q out ) / (S×h)=(70000-10000) / (300×1000×1)=0.2.

[0085] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0086] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

Claims

1. An in-situ testing system for the water storage coefficient of underground water reservoirs in coal mines, characterized in that: include: A water inlet system, comprising a temporary water tank provided on the high working surface; A water storage system, comprising a reservoir, the reservoir being composed of a goaf on a low-level working face, a coal pillar dam, and an artificial dam, the artificial dam being provided with a water outflow monitor and a water level monitor corresponding to the reservoir; Wherein, the temporary water tank is connected to the reservoir via a water delivery structure constructed from the high-level working surface to the low-level working surface, and a water inlet flow monitor is provided on the water delivery structure; The water inlet system also includes: A water-passing and air-blocking tunnel is constructed on the low-level working surface, one end of the water-passing and air-blocking tunnel is connected to the reservoir, and the other end corresponds to the water outlet at the bottom of the water conveyance structure; The top plate of the water-passing and air-blocking tunnel is provided with a depression and a protrusion, the depression is located on the side of the protrusion close to the reservoir, the lengths of the depression and the protrusion in the width direction of the water-passing and air-blocking tunnel are both equal to the width of the water-passing and air-blocking tunnel, and a water retaining wall is provided in the water-passing and air-blocking tunnel directly below the depression; Among them, the top height of the water retaining wall is higher than the height of the top plate of the water-passing and air-blocking tunnel and is lower than the height of the highest point of the depression.

2. The in-situ testing system for the water storage coefficient of underground water reservoirs in coal mines according to claim 1, characterized in that: The water delivery structure comprises: a water inlet channel, the water inlet channel being constructed in the stratum between the high-level working surface and the low-level working surface and connecting the temporary water tank and the reservoir; a water inlet pipe extending from the interior of the temporary water tank to the upper half of the water inlet channel; Wherein, the water inlet flow monitor is arranged on the water inlet pipe.

3. The in-situ testing system for the water storage coefficient of underground water reservoirs in coal mines according to claim 2, characterized in that: The water inlet channel is a tubular structure with a straight axis, and the angle between the axis of the water inlet channel and the horizontal plane is an acute angle.

4. The in-situ testing system for water storage coefficient of underground water reservoir in coal mine according to claim 1, characterized in that: A drainage pipe and a water level monitoring pipe connected to the reservoir are respectively provided on the artificial dam body near the bottom of the reservoir, and valves are provided on the drainage pipe and the water level monitoring pipe; Wherein, the water flow monitor and the water level monitor are respectively arranged on the drainage pipe and the water level monitoring pipe.

5. The in-situ testing system for the water storage coefficient of underground water reservoirs in coal mines according to claim 4, characterized in that: The drainage pipe and the water level monitoring pipe are both provided with steel wire filters on the pipe openings at one end located inside the reservoir.

6. The in-situ testing system for the water storage coefficient of underground water reservoirs in coal mines according to claim 5, characterized in that: A plurality of water-permeable holes are provided on the pipe wall of one end of the drainage pipe and the water level monitoring pipe located inside the reservoir.

7. The in-situ testing system for the water storage coefficient of underground water reservoirs in coal mines according to claim 2, characterized in that: A waterproof layer is further provided between the inner wall of the water inlet channel and the outer wall of the water inlet pipe, and the waterproof layer is composed of mortar.

8. An in-situ testing method for the water storage coefficient of a coal mine underground reservoir, applied to the in-situ testing system according to any one of claims 1 to 7, characterized in that: include: Step a: obtaining the flow rate Qin of water flowing into the reservoir through the water inlet flow monitor of the water inlet pipe, obtaining the flow rate Qout of water discharged from the reservoir through the water outlet flow monitor of the discharge pipe, and obtaining the current water level height h of the reservoir through the water level monitor of the water level monitoring pipe; Step b: Calculate the water storage coefficient of the reservoir according to the following formula: R h =(Q in -Q out ) / V h In h =(S×h) Among them, R h is the water storage coefficient, V h is the spatial volume of the reservoir when the water level is h, and S is the reservoir area.

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