System and method for monitoring seepage of dam body of underground reservoir of coal mine

Abstract

The invention provides a coal mine underground reservoir dam seepage monitoring system and method.The system comprises a reservoir dam body, multiple optical fiber sensing mechanisms and a processing module, the optical fiber sensing mechanisms are evenly arranged along the inner wall of the reservoir dam body, and the optical fiber sensing mechanisms are used for collecting the temperature value of the reservoir dam body; the processing module is used for determining the seepage condition of the reservoir dam body based on the temperature value, real-time continuous monitoring can be carried out, monitoring automation is achieved, and therefore the seepage monitoring precision of the reservoir dam body is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground water reservoirs in coal mines, and in particular to a monitoring system and method for seepage in a dam body of an underground water reservoir in a coal mine. Background Art

[0002] Coal mine underground reservoir is an underground reservoir that uses the coal mine underground goaf as a water storage space to store mine water. The dam of the coal mine underground reservoir is formed by connecting the safe coal pillars in the goaf with an artificial dam, but the reservoir dam will produce mine water seepage under the action of water and rock, affecting the safe operation of the underground reservoir.

[0003] In the existing technology, the main methods used for groundwater reservoir seepage monitoring include seepage pressure and seepage measurement, environmental and temperature tracing, electromagnetic detection, etc. These methods have different characteristics, but all have the problems of low degree of automation and difficulty in real-time continuous monitoring. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a monitoring system and method for seepage of underground reservoir dam in coal mines, which can continuously monitor the seepage problem of reservoir dam in real time and realize automatic monitoring.

[0005] In a first aspect, an embodiment of the present invention provides a monitoring system for seepage of a dam body of an underground water reservoir in a coal mine, comprising:

[0006] The reservoir dam body includes a reservoir dam body, an artificial dam body and a safety coal pillar. The artificial dam body is arranged between adjacent safety coal pillars. The reservoir dam body, the artificial dam body and the safety coal pillar form a closed water storage space. The reservoir dam body is used to store water.

[0007] At least one optical fiber sensing mechanism, a plurality of optical fiber sensing mechanisms are evenly arranged along the inner wall of the reservoir dam body, and the optical fiber sensing mechanisms are used to collect the temperature value of the reservoir dam body;

[0008] The processing module is connected with the optical fiber sensing mechanism and is used to detect the seepage condition of the reservoir dam body based on the temperature value.

[0009] In an optional embodiment, the optical fiber sensing mechanism includes an optical fiber structure, the optical fiber mechanism includes an optical fiber and a copper wire, the optical fiber and the copper wire are arranged adjacent to each other, the optical fiber is used to measure temperature, and the copper wire is used to adjust the ambient temperature of the optical fiber.

[0010] In an optional embodiment, the optical fiber sensing mechanism includes two groups of optical fiber structures, which are arranged adjacent to each other. The two groups of optical fiber structures can be used alternatively to monitor the seepage of the reservoir dam in real time.

[0011] In an optional embodiment, one end of the optical fiber sensing mechanism is arranged on one side of the reservoir dam body, and the other end extends to the lane of the reservoir dam body.

[0012] In an optional embodiment, the optical fiber sensing mechanism is arranged in a spiral manner along the inner wall of the reservoir dam.

[0013] In an optional embodiment, the monitoring system further includes an anchor rod, and the optical fiber sensing mechanism is fixedly connected to the inner wall of the reservoir dam body via the anchor rod.

[0014] In an optional embodiment, the processing module includes a percolation unit and a positioning unit;

[0015] The seepage unit is connected to the optical fiber sensing mechanism and is used to determine the presence of seepage in the reservoir dam body based on the temperature value;

[0016] The positioning unit is connected with the seepage unit and is used for the total length of optical fiber, the helical pitch of optical fiber and the meter mark of optical fiber sensing mechanism to determine the seepage position of the reservoir dam body.

[0017] In a second aspect, a method for monitoring seepage in a coal mine underground reservoir dam provided by an embodiment of the present invention is applied to a monitoring system for seepage in a coal mine underground reservoir dam, and the method comprises:

[0018] Get the temperature value of the inner wall of the reservoir dam;

[0019] Based on the temperature value, determine whether there is seepage in the reservoir dam.

[0020] In an optional embodiment, judging whether there is seepage in the reservoir dam body based on the temperature value includes:

[0021] Based on the temperature value, it is determined that there is seepage in the reservoir dam;

[0022] The seepage position of the reservoir dam is determined based on the total length of the optical fiber, the optical fiber helical pitch and the optical fiber meter mark of the optical fiber sensing mechanism.

[0023] In an optional embodiment, determining the presence of seepage in the reservoir dam body based on the temperature value includes:

[0024] Based on the temperature difference between the seepage part and the non-seepage part of the reservoir dam body, it is determined that there is seepage in the reservoir dam body.

[0025] The embodiment of the present invention provides a system and method for monitoring seepage of an underground reservoir dam in a coal mine. At least one optical fiber sensing mechanism is arranged on the inner wall of the reservoir dam. The optical fiber sensing mechanism is used to collect the temperature value of the reservoir dam. The temperature value is used to determine whether there is seepage in the reservoir dam. Real-time continuous monitoring can be performed, and the automation of monitoring is realized, thereby improving the accuracy of reservoir dam seepage monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic structural diagram of a coal mine underground reservoir dam seepage monitoring system provided by an embodiment of the present invention is shown;

[0028] Figure 2 A schematic structural diagram of a reservoir dam body provided by an embodiment of the present invention is shown;

[0029] Figure 3 A schematic flow chart of a method for monitoring seepage in a coal mine underground reservoir dam provided by an embodiment of the present invention is shown.

[0030] Explanation of main component symbols: 100 - reservoir dam body; 110 - safety coal pillar; 120 - artificial dam body; 130 - reservoir inner wall; 200 - optical fiber sensing mechanism; 300 - DC power supply. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0032] In the prior art, the seepage monitoring of underground reservoir dams in coal mines generally adopts seepage pressure and seepage measurement, environmental and temperature tracing, electromagnetic detection, etc., which has the problems of low automation and difficulty in achieving real-time continuous monitoring. In addition, the traditional seepage monitoring of underground reservoir dams in coal mines is mainly based on point measurement, and the measurement distance, measurement range and positioning accuracy are all limited. Based on this, the present invention provides a monitoring system and method for seepage of underground reservoir dams in coal mines, by setting at least one optical fiber sensing mechanism on the inner wall of the reservoir dam body, the optical fiber sensing mechanism is used to collect the temperature value of the reservoir dam body, and through the temperature value, it is judged whether there is seepage in the reservoir dam body, and real-time continuous monitoring can be performed, realizing the automation of monitoring, thereby improving the accuracy of reservoir dam seepage monitoring.

[0033] Figure 1 A schematic diagram of a monitoring system for seepage in a coal mine underground reservoir dam provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the system includes: a reservoir dam body 100, a fiber optic sensing mechanism 200 and a processing module, the reservoir dam body 100 includes an artificial dam body 120 and a safety coal pillar 110, the artificial dam body 120 is arranged between adjacent safety coal pillars 110, and the reservoir dam body 100 is used to store water; at least one fiber optic sensing mechanism 200, a plurality of fiber optic sensing mechanisms 200 are evenly arranged along the inner wall of the reservoir dam body 100, and the fiber optic sensing mechanism 200 is used to collect the temperature value of the reservoir dam body 100; the processing module is connected to the fiber optic sensing mechanism 200, and is used to determine whether there is seepage in the reservoir dam body 100 based on the temperature value.

[0034] In the present application, by distributing the optical fiber sensing mechanism 200 on the inner wall of the reservoir dam body 100, the seepage condition of the dam body is determined based on the temperature value of the reservoir dam body 100 collected by the optical fiber sensing mechanism 200, and real-time continuous monitoring can be performed, thereby realizing the automation of monitoring and accurately locating the seepage point, thereby improving the accuracy of dam body seepage monitoring.

[0035] Further, if Figure 2 As shown, the coal mine reservoir dam turns the mined area into a water storage space, so it is necessary to construct a reservoir dam, and use an artificial dam 120 to connect discontinuous safety coal pillars 110 to form a closed water storage space, wherein the safety coal pillar 110 refers to the unmined coal reserved within the coal mining range for the safety of ground buildings and mine production.

[0036] Furthermore, the optical fiber sensing mechanism 200 adopts distributed optical fiber sensing technology, and the optical fiber sensing mechanism 200 is distributedly arranged on the inner wall of the reservoir dam body 100, and the seepage of the reservoir dam body 100 is monitored by active heating, thereby increasing the temperature difference between the seepage part and the non-seepage part of the reservoir dam body 100, so as to achieve accurate identification and positioning of the seepage part of the reservoir dam body 100.

[0037] In an optional embodiment, the optical fiber sensing mechanism 200 includes an optical fiber structure, which includes an optical fiber and a copper wire. The optical fiber and the copper wire are arranged adjacent to each other. The optical fiber is used to measure temperature, and the copper wire is used to adjust the environment in which the optical fiber is located.

[0038] In the present application, the optical fiber sensing mechanism 200 adopts an optical-copper composite structure, wherein the optical fiber and the copper wire are arranged in parallel in the same optical cable, the optical fiber is used for temperature measurement, and the copper wire is used for active heating of the optical fiber.

[0039] It should be noted that optical fiber is both a sensing element and a signal transmission channel. Distributed Temperature Sensing (DTS) technology is a technology that continuously and real-time measures the temperature field along the optical fiber based on the Raman scattering temperature effect, and locates the temperature measurement point based on the principle of optical time domain reflection. It has the advantages of long distance, large range, anti-interference, high precision, stability and durability. Among them, distributed optical fiber sensing monitoring technology includes active heating and passive monitoring. Active heating uses heat pulses to input a current of known power into the optical fiber and monitor the resulting thermal response. Passive monitoring uses optical time domain reflection technology to monitor the temperature and strain at different positions along the optical fiber in the natural environment.

[0040] When seepage occurs in the dam body 100 of the underground reservoir in the coal mine, heat conduction and heat convection will occur between the optical fiber and the dam body, and between the optical fiber and the water body, resulting in a temperature difference between the seepage area and the non-seepage area. The temperature change is used to monitor and identify the seepage area of ​​the reservoir dam body 100.

[0041] In an optional embodiment, the optical fiber sensing mechanism 200 includes two sets of optical fiber structures, which are arranged adjacent to each other. The two sets of optical fiber structures can be used alternatively to monitor the seepage of the reservoir dam body 100 in real time.

[0042] Specifically, the optical fiber sensing mechanism 200 uses two groups of optical fiber mechanisms, one group of optical fiber components is used to monitor the seepage of the reservoir dam body 100 in real time, and the other group of optical fiber components is used for backup.

[0043] In the present application, the optical fiber sensing mechanism 200 adopts a "2+2" combination, that is, it is composed of 2 optical fibers and 2 copper wires, 1 optical fiber and 1 copper wire are used for monitoring, and the other 1 optical fiber and 1 copper wire are used for backup.

[0044] In an optional embodiment, one end of the optical fiber sensing mechanism 200 is disposed on one side of the reservoir dam body 100 , and the other end extends to the other side of the reservoir dam body 100 .

[0045] In an optional embodiment, the optical fiber sensing mechanism 200 is disposed in a spiral manner along the inner wall of the reservoir dam body 100 .

[0046] Specifically, the fiber optic sensing mechanism 200 arranges optical fibers along the inner wall 130 of the reservoir, and the optical fiber ends and tails pass through the artificial dam body 120 and extend to the tunnel. The optical fibers are arranged in a "spiral" ascending and rotating manner, from the bottom plate of the coal mine reservoir along the inner wall 130 of the reservoir to the top plate of the coal seam. The smaller the spiral pitch density, the better, so as to improve the spatial resolution of the fiber optic observation.

[0047] In an optional embodiment, the monitoring system further includes an anchor rod, and the optical fiber sensing mechanism 200 is fixedly connected to the inner wall of the reservoir dam body 100 via the anchor rod.

[0048] Specifically, to ensure that the optical fiber remains stable after the coal mine underground reservoir is injected with mine water, a non-metallic fiber reinforced plastic anchor rod is used to fix the optical fiber sensing mechanism 200, and the anchor rod spraying treatment is performed on the outside of the optical cable to enhance the stability of the optical cable.

[0049] In an optional embodiment, the monitoring system further includes a DC power supply 300 and a DTS monitor, wherein the optical fiber end in the optical fiber sensing mechanism 200 is connected to the DTS monitor, and the copper wire is connected to the DC power supply 300 .

[0050] When the seepage of the underground reservoir dam 100 of the coal mine is monitored by the monitoring system, the DC power supply 300 heats the copper wire and performs temperature calibration on the optical fiber, and then the DTS monitor is used to start measuring the real-time temperature change and store the measured temperature value.

[0051] In an optional embodiment, the processing module includes a percolation unit and a positioning unit;

[0052] The seepage unit is connected to the optical fiber sensing mechanism 200 and is used to determine the presence of seepage in the reservoir dam body 100 based on the temperature value;

[0053] The positioning unit is connected to the seepage unit and is used for the total length of the optical fiber, the optical fiber helical pitch and the optical fiber meter mark of the optical fiber sensing mechanism 200 to determine the seepage position of the reservoir dam body 100 .

[0054] Furthermore, the presence of seepage in the reservoir dam body is determined by the location of the temperature anomaly, wherein the location of the temperature anomaly can be determined based on the scattered light return time and the location where the scattered light occurs, and the temperature anomaly location can be determined by the following formula:

[0055]

[0056] Where S is the distance between the light source and the scattering point, Δt is the time difference between laser emission and the return of scattered light, c is the vacuum speed of light, and n is the refractive index of the optical fiber.

[0057] Specifically, the seepage unit is used to qualitatively identify the seepage of the dam body. According to the monitoring curve of the measured temperature change with the optical fiber length, the temperature anomaly is used to determine the seepage of the dam body. When water seeps out of the dam body, the temperature drops significantly. Therefore, the low temperature anomaly on the temperature curve is used as the criterion for determining the seepage of the dam body, thereby qualitatively identifying the seepage of the dam body.

[0058] The positioning unit is used to quantitatively identify the seepage site of the dam body. On the basis of qualitatively determining the existence of seepage in the dam body, the low-temperature anomaly position of the temperature curve is calculated according to the total length of the optical fiber, the optical fiber helix pitch and the optical fiber meter mark to accurately determine the spatial position of the seepage site of the dam body.

[0059] The present invention provides a coal mine underground reservoir dam seepage monitoring system, which has the following effects:

[0060] 1. The traditional monitoring of seepage in underground coal mine reservoirs adopts seepage pressure and seepage measurement, environmental and temperature tracing, electromagnetic detection, etc., which has the problems of low automation and difficulty in realizing real-time continuous monitoring. Therefore, the coal mine underground reservoir dam seepage monitoring method proposed in this application based on distributed optical fiber temperature sensing technology can perform real-time continuous monitoring and realize the automation of monitoring.

[0061] 2. Traditional coal mine underground reservoir seepage monitoring is mainly based on point measurement, and the measurement distance, measurement range and positioning accuracy are limited. The dam seepage monitoring method based on distributed optical fiber temperature sensing in this application has the advantages of long distance, large range, anti-interference, high accuracy, stability and durability. The optical time domain reflection technology is used to accurately locate the temperature measurement point, thereby improving the accuracy of dam seepage monitoring.

[0062] 3. In this application, the DTS active heating method is used, the purpose of which is to accurately identify and locate the seepage part of the reservoir dam by increasing the temperature difference between the seepage part and the non-seepage part of the reservoir dam. Alternatively, DTS adopts a passive monitoring method to realize the seepage monitoring of the artificial dam of the coal mine underground reservoir. Compared with the active heating monitoring method, the monitoring accuracy will be affected to a certain extent.

[0063] Figure 3 A flow chart of a method for monitoring seepage in a coal mine underground reservoir dam provided by an embodiment of the present invention is shown as follows: Figure 3 As shown, the method is applied to a monitoring system for seepage in a dam of an underground reservoir in a coal mine, and the method comprises the following steps:

[0064] Step S110, obtaining the temperature value of the inner wall of the reservoir dam body;

[0065] Step S120: Based on the temperature value, determine whether there is seepage in the reservoir dam body.

[0066] In an optional embodiment, judging whether there is seepage in the reservoir dam body based on the temperature value includes:

[0067] Based on the temperature value, it is determined that there is seepage in the reservoir dam;

[0068] The seepage position of the reservoir dam is determined based on the total length of the optical fiber, the optical fiber helical pitch and the optical fiber meter mark of the optical fiber sensing mechanism.

[0069] In an optional embodiment, determining the presence of seepage in the reservoir dam body based on the temperature value includes:

[0070] Based on the temperature difference between the seepage part and the non-seepage part of the reservoir dam body, it is determined that there is seepage in the reservoir dam body.

[0071] In an optional embodiment, the monitoring system comprises:

[0072] The reservoir dam body includes a reservoir dam body, an artificial dam body and a safety coal pillar. The artificial dam body is arranged between adjacent safety coal pillars. The reservoir dam body, the artificial dam body and the safety coal pillar form a closed water storage space. The reservoir dam body is used to store water.

[0073] At least one optical fiber sensing mechanism, a plurality of optical fiber sensing mechanisms are evenly arranged along the inner wall of the reservoir dam body, and the optical fiber sensing mechanisms are used to collect the temperature value of the reservoir dam body;

[0074] The processing module is connected with the optical fiber sensing mechanism and is used to detect the seepage condition of the reservoir dam body based on the temperature value.

[0075] In an optional embodiment, the optical fiber sensing mechanism includes an optical fiber structure, the optical fiber mechanism includes an optical fiber and a copper wire, the optical fiber and the copper wire are arranged adjacent to each other, the optical fiber is used to measure temperature, and the copper wire is used to adjust the ambient temperature of the optical fiber.

[0076] In an optional embodiment, the optical fiber sensing mechanism includes two groups of optical fiber structures, which are arranged adjacent to each other. The two groups of optical fiber structures can be used alternatively to monitor the seepage of the reservoir dam in real time.

[0077] In an optional embodiment, one end of the optical fiber sensing mechanism is arranged on one side of the reservoir dam body, and the other end extends to the lane of the reservoir dam body.

[0078] In an optional embodiment, the optical fiber sensing mechanism is arranged in a spiral manner along the inner wall of the reservoir dam.

[0079] In an optional embodiment, the monitoring system further includes an anchor rod, and the optical fiber sensing mechanism is fixedly connected to the inner wall of the reservoir dam body via the anchor rod.

[0080] The method provided in the embodiment of the present application has the same implementation principle and technical effects as those in the aforementioned system embodiment. For the sake of brief description, for matters not mentioned in the method embodiment, reference may be made to the corresponding contents in the aforementioned system embodiment.

[0081] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0082] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0083] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] Finally, it should be noted that the above embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes 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 of the present invention. They should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A monitoring system for seepage of underground reservoir dam in coal mine, characterized in that: include: A reservoir dam body, comprising a reservoir dam body, an artificial dam body and a safety coal pillar, wherein the artificial dam body is arranged between adjacent safety coal pillars, the reservoir dam body, the artificial dam body and the safety coal pillars form a closed water storage space, and the reservoir dam body is used to store water; At least one optical fiber sensing mechanism, a plurality of optical fiber sensing mechanisms are evenly arranged along the inner wall of the reservoir dam body, and the optical fiber sensing mechanism is used to collect the temperature value of the reservoir dam body; The processing module is connected to the optical fiber sensing mechanism and is used to detect the seepage condition of the reservoir dam body based on the temperature value.

2. The coal mine underground reservoir dam seepage monitoring system according to claim 1, characterized in that: The optical fiber sensing mechanism comprises an optical fiber structure, and the optical fiber mechanism comprises an optical fiber and a copper wire, wherein the optical fiber and the copper wire are arranged adjacent to each other, the optical fiber is used to measure temperature, and the copper wire is used to adjust the ambient temperature of the optical fiber.

3. The coal mine underground reservoir dam seepage monitoring system according to claim 2, characterized in that: The optical fiber sensing mechanism comprises two groups of optical fiber structures, which are arranged adjacent to each other and can be used alternatively to monitor the seepage of the reservoir dam in real time.

4. The monitoring system for seepage of underground reservoir dam in coal mine according to any one of claims 1 to 3, characterized in that: One end of the optical fiber sensing mechanism is arranged on one side of the reservoir dam body, and the other end extends to the lane of the reservoir dam body.

5. The coal mine underground reservoir dam seepage monitoring system according to claim 4, characterized in that: The optical fiber sensing mechanism is arranged in a spiral manner along the inner wall of the reservoir dam body.

6. The coal mine underground reservoir dam seepage monitoring system according to claim 4, characterized in that: The monitoring system also includes an anchor rod, and the optical fiber sensing mechanism is fixedly connected to the inner wall of the reservoir dam body through the anchor rod.

7. The coal mine underground reservoir dam seepage monitoring system according to claim 1, characterized in that: The processing module includes a seepage unit and a positioning unit; The seepage unit is connected to the optical fiber sensing mechanism and is used to determine the presence of seepage in the reservoir dam body based on the temperature value; The positioning unit is connected to the seepage unit and is used for the total length of the optical fiber, the helical pitch of the optical fiber and the optical fiber meter mark of the optical fiber sensing mechanism to determine the seepage position of the reservoir dam body.

8. A method for monitoring seepage in a coal mine underground reservoir dam, characterized in that: A monitoring system for seepage in a coal mine underground reservoir dam as claimed in any one of claims 1 to 7, the method comprising: Get the temperature value of the inner wall of the reservoir dam; Based on the temperature value, it is determined whether there is seepage in the reservoir dam body.

9. The method for monitoring seepage of underground reservoir dam in coal mine according to claim 8, characterized in that: Based on the temperature value, determining whether the reservoir dam body has seepage includes: Based on the temperature value, determining that seepage exists in the reservoir dam body; The seepage position of the reservoir dam body is determined based on the total length of the optical fiber, the optical fiber helical pitch and the optical fiber meter mark of the optical fiber sensing mechanism.

10. The method for monitoring seepage of underground reservoir dam in coal mine according to claim 9, characterized in that: Determining whether seepage exists in the reservoir dam body based on the temperature value includes: Based on the temperature difference between the seepage part and the non-seepage part of the reservoir dam body, it is determined that seepage exists in the reservoir dam body.

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