Method for monitoring the life of a coal mine underground reservoir

Abstract

The application provides a coal mine underground reservoir service life monitoring method, which comprises the following steps: acquiring silt deposition parameters, water quality parameters and coal column dam body parameters of a coal mine underground reservoir; comparing the silt deposition parameters with preset silt deposition parameters, comparing the water quality parameters with preset water quality parameters, and comparing the coal column dam body parameters with preset coal column dam body parameters; and determining that the service life of the coal mine underground reservoir ends when the silt deposition parameters, the water quality parameters and the coal column dam body parameters all do not meet the requirements. Through the technical scheme provided in the application, the problem that the service life of an underground reservoir cannot be monitored in the related art and safety accidents are prone to occur can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining, and in particular to a method for monitoring the life of underground water reservoirs in coal mines. Background Art

[0002] Coal is the cornerstone of my country's energy security. Western China (Shanxi, Shaanxi, Inner Mongolia, Ningxia, and Gansu) is the primary coal-producing region, accounting for over 75% of national reserves and production. However, water resources are scarce in this region, and the surface ecology is fragile. Therefore, coal mining must address water use and water imbalance within the mining area.

[0003] In related technologies, underground water reservoirs are set up. Coal mine underground water reservoirs utilize the goaf formed by coal mining, and are formed by connecting the coal pillar dam body with the artificial dam body. The mine water is diverted to the underground goaf for storage and utilization. The underground water reservoir is used to avoid the discharge of mine water, which can reduce the energy consumption of coal mining and enable the use of water to be evenly allocated.

[0004] However, considering safety factors, since groundwater reservoirs have a service life cycle, it is impossible to monitor the service life of groundwater reservoirs when they are in use, which makes safety accidents prone to occur. Summary of the Invention

[0005] The present invention provides a coal mine underground water reservoir life monitoring method to solve the problem in the related art that the service life of the underground water reservoir cannot be monitored and safety accidents are likely to occur.

[0006] The present invention provides a life monitoring method for a coal mine underground reservoir, which includes: obtaining silt deposition parameters, water quality parameters and coal pillar dam body parameters of the coal mine underground reservoir; comparing the silt deposition parameters with preset silt deposition parameters, comparing the water quality parameters with preset water quality parameters, and comparing the coal pillar dam body parameters with preset coal pillar dam body parameters; when the silt deposition parameters, water quality parameters and coal pillar dam body parameters all do not meet the requirements, determining that the service life of the coal mine underground reservoir has ended.

[0007] Furthermore, in the step of obtaining silt deposition parameters, water quality parameters and coal pillar dam parameters of the coal mine underground reservoir, the step of obtaining silt deposition parameters of the coal mine underground reservoir includes: obtaining silt deposition parameters at the water inlet and outlet of the coal mine underground reservoir.

[0008] Furthermore, in the step of obtaining the silt accumulation parameters at the water inlet and outlet of the coal mine underground water reservoir, the step of obtaining the silt accumulation parameters at the water inlet of the coal mine underground water reservoir includes obtaining the pressure value and flow value at the water inlet of the coal mine underground water reservoir; when the pressure value at the water inlet of the coal mine underground water reservoir is greater than the preset pressure value and / or the flow value at the water inlet of the coal mine underground water reservoir is less than the preset flow value, it is determined that silt accumulation occurs at the water inlet of the coal mine underground water reservoir, and then it is determined that the silt accumulation parameters do not meet the requirements.

[0009] Furthermore, in the step of obtaining the silt accumulation parameters at the water inlet and outlet of the coal mine underground water reservoir, the step of obtaining the silt accumulation parameters at the water outlet of the coal mine underground water reservoir includes obtaining the flow value at the water outlet of the coal mine underground water reservoir; when the flow value at the water outlet of the coal mine underground water reservoir decreases by 30% to 50% compared with the initial value of the operation of the coal mine underground water reservoir, it is determined that the silt accumulation of the coal mine underground water reservoir affects the use of the coal mine underground water reservoir; when the flow value at the water outlet of the coal mine underground water reservoir decreases by more than 50% compared with the initial value of the operation of the coal mine underground water reservoir, it is determined that the silt accumulation parameters do not meet the requirements.

[0010] Furthermore, after the step of obtaining the silt deposition parameters at the water inlet and outlet of the coal mine underground reservoir, the coal mine underground reservoir life monitoring method also includes: conducting geophysical exploration of the silt deposition area of ​​the coal mine underground reservoir, and using the geophysical exploration results to verify the silt deposition parameters at the water inlet and outlet of the coal mine underground reservoir.

[0011] Furthermore, geophysical exploration is conducted on the siltation area of ​​the coal mine underground reservoir, and the steps of using the geophysical exploration results to verify the silt deposition parameters at the water inlet and outlet of the coal mine underground reservoir include: setting the outlet elevation of the coal mine underground reservoir as a first baseline, drilling and pumping water within a first preset distance from the first baseline to obtain the suspended matter concentration, and when the suspended matter concentration is ≥3000 mg / L, determining that the silt deposition parameters do not meet the requirements; and / or, setting the water inlet elevation of the coal mine underground reservoir as a second baseline, drilling and pumping water within a second preset distance from the second baseline to obtain the suspended matter concentration, and when the suspended matter concentration is ≥3000 mg / L, determining that the silt deposition parameters do not meet the requirements.

[0012] Furthermore, in the step of obtaining the silt deposition parameters, water quality parameters and coal pillar dam parameters of the coal mine underground reservoir, the step of obtaining the coal pillar dam parameters of the coal mine underground reservoir includes: obtaining the coal pillar dam strength parameters and coal pillar dam crack development parameters of the coal mine underground reservoir.

[0013] Furthermore, in the step of obtaining the strength parameters of the coal pillar dam body and the crack development parameters of the coal pillar dam body of the coal mine underground reservoir, the step of obtaining the strength parameters of the coal pillar dam body of the coal mine underground reservoir includes: installing a borehole stress gauge on the coal pillar dam body of the coal mine underground reservoir, and using the borehole stress gauge to monitor the stress change value of the coal pillar dam body of the coal mine underground reservoir within a preset time. If the stress change value is greater than the preset stress change range, it is determined that the strength parameters of the coal pillar dam body do not meet the requirements, and then it is determined that the parameters of the coal pillar dam body do not meet the requirements; and / or, sampling the coal pillar dam body of the coal mine underground reservoir and conducting rock mechanics tests to obtain the peak stress of the dam body measured by the test. If the peak stress of the dam body measured by the test is less than the actual monitored stress of the dam body, it is determined that the strength parameters of the coal pillar dam body do not meet the requirements, and then it is determined that the parameters of the coal pillar dam body do not meet the requirements.

[0014] Furthermore, in the step of obtaining the strength parameters of the coal pillar dam body and the crack development parameters of the coal pillar dam body of the coal mine underground reservoir, the step of obtaining the crack development parameters of the coal pillar dam body of the coal mine underground reservoir includes: installing a strain gauge and a piezometer on the coal pillar dam body of the coal mine underground reservoir, and using the strain gauge and the piezometer to obtain the crack development parameters of the coal pillar dam body; if the crack development parameters of the coal pillar dam body are greater than the preset crack development parameters, it is determined that the crack development parameters of the coal pillar dam body do not meet the requirements, and further it is determined that the coal pillar dam body parameters do not meet the requirements; and / or, installing a strain gauge on the coal pillar dam body of the coal mine underground reservoir, and using the strain gauge to obtain the initial coal pillar front strain gauge monitoring deformation value P 初1 , Initial coal pillar rear strain gauge monitoring deformation value P 初2 , the deformation value P1 monitored by the strain gauge at the front of the coal pillar during use and the deformation value P2 monitored by the strain gauge at the rear of the coal pillar during use, if It is determined that the crack development parameters of the coal pillar dam body do not meet the requirements, and further it is determined that the coal pillar dam body parameters do not meet the requirements.

[0015] Furthermore, in the step of obtaining the silt deposition parameters, water quality parameters and coal pillar dam parameters of the coal mine underground reservoir, the step of obtaining the water quality parameters of the coal mine underground reservoir includes obtaining the suspended matter concentration, total dissolved solids and total hardness of the water quality of the coal mine underground reservoir; if the suspended matter concentration is greater than 30 mg / L, the total dissolved solids is greater than 1000 mg / L and the total hardness is greater than 1000 mg / L, it is determined that the water quality parameters do not meet the requirements.

[0016] By applying the technical solution of the present invention, when monitoring the life characteristics of a coal mine underground water reservoir, the silt deposition parameters of the coal mine underground water reservoir are obtained, and the obtained silt deposition parameters are compared with the preset silt deposition parameters to determine the silt deposition situation of the coal mine underground water reservoir. In addition, it is necessary to obtain the water quality parameters of the coal mine underground water reservoir, and compare the obtained water quality parameters with the preset parameters to determine the wastewater treatment capacity of the coal mine underground water reservoir. It is also necessary to obtain the coal pillar dam parameters, and compare the obtained coal pillar dam parameters with the preset coal pillar dam parameters, so as to ensure that the coal pillar dam can play a supporting and protective role when the coal mine underground water reservoir is in operation. By obtaining the above parameters, the coal pillar dam is determined. The life characteristics of the coal mine underground reservoir. When the silt deposition parameters, water quality parameters and coal pillar dam parameters do not meet the requirements, it is determined that the coal mine underground reservoir cannot operate normally, and therefore the service life of the coal mine underground reservoir is determined to be over. Then, by comparing the obtained parameters with the preset parameters, the safety of the coal mine underground reservoir is ensured, and a variety of monitoring methods are combined to measure the various parameters of the coal mine underground reservoir, thereby ensuring the accuracy of the life cycle judgment results of the coal mine underground reservoir, avoiding the limitations of using a single monitoring method, and taking corresponding measures in time according to the use of the coal mine underground reservoir, thereby ensuring the safety of the coal mine underground reservoir and avoiding safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 A flow chart of a method for monitoring the life of an underground water reservoir in a coal mine according to an embodiment of the present invention is shown;

[0019] Figure 2 A schematic structural diagram of a coal mine underground water reservoir provided according to an embodiment of the present invention is shown.

[0020] The above drawings include the following reference numerals:

[0021] 10. Coal mine underground reservoir; 11. Water inlet; 12. Water outlet; 13. Coal pillar dam;

[0022] 21. Flow meter; 22. Pressure gauge. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a method for monitoring the life of a coal mine underground reservoir, the method comprising:

[0025] S100, obtaining silt deposition parameters, water quality parameters, and coal pillar dam parameters of the coal mine underground reservoir 10;

[0026] S200, comparing silt deposition parameters with preset silt deposition parameters, comparing water quality parameters with preset water quality parameters, and comparing coal pillar dam parameters with preset coal pillar dam parameters;

[0027] S300: When the silt deposition parameters, water quality parameters, and coal pillar dam parameters do not meet the requirements, it is determined that the service life of the coal mine underground water reservoir 10 has ended.

[0028] The coal mine underground water reservoir life monitoring method provided in this embodiment is applied. When the life characteristic monitoring of the coal mine underground water reservoir 10 is performed, the silt deposition parameters of the coal mine underground water reservoir 10 are obtained, and the obtained silt deposition parameters are compared with the preset silt deposition parameters to determine the silt deposition situation of the coal mine underground water reservoir 10. In addition, it is necessary to obtain the water quality parameters of the coal mine underground water reservoir 10, and compare the obtained water quality parameters with the preset parameters to determine the wastewater treatment capacity of the coal mine underground water reservoir 10. It is also necessary to obtain the coal pillar dam parameters, and compare the obtained coal pillar dam parameters with the preset coal pillar dam parameters to ensure that the coal pillar dam 13 can play a supporting and protective role when the coal mine underground water reservoir 10 is in operation. By obtaining the above parameters , determine the life characteristics of the coal mine underground water reservoir 10. When the silt deposition parameters, water quality parameters and coal pillar dam parameters do not meet the requirements, it is determined that the coal mine underground water reservoir 10 cannot operate normally, and therefore it is determined that the service life of the coal mine underground water reservoir 10 has ended. Then, by comparing the obtained parameters with the preset parameters, the safety of the coal mine underground water reservoir 10 is ensured, and a variety of monitoring methods are combined to measure the various parameters of the coal mine underground water reservoir 10, thereby ensuring the accuracy of the life cycle judgment results of the coal mine underground water reservoir 10, avoiding the limitations of using a single monitoring method, and taking corresponding measures in time according to the use of the coal mine underground water reservoir 10, thereby ensuring the safety of the coal mine underground water reservoir 10 and avoiding safety accidents.

[0029] In this embodiment, in step S100 of obtaining the silt deposition parameters, water quality parameters, and coal pillar dam parameters of the coal mine underground reservoir 10, the step of obtaining the silt deposition parameters of the coal mine underground reservoir 10 includes:

[0030] Obtaining silt deposition parameters at the water inlet 11 and the water outlet 12 of the coal mine underground water reservoir 10. Through the above steps, by obtaining the silt deposition parameters at the water inlet 11 and the water outlet 12 of the coal mine underground water reservoir 10, it is possible to monitor the water inlet 11 and the water outlet 12 when discharging wastewater into the coal mine underground water reservoir 10, thereby facilitating rapid determination of the silt deposition parameters of the coal mine underground water reservoir 10 and ensuring accurate monitoring results.

[0031] In this embodiment, in the step of obtaining silt accumulation parameters at the water inlet 11 and the water outlet 12 of the coal mine underground water reservoir 10, the step of obtaining the silt accumulation parameters at the water inlet 11 of the coal mine underground water reservoir 10 includes obtaining the pressure value and the flow value at the water inlet 11 of the coal mine underground water reservoir 10. Through the above steps, a flow meter 21 and a pressure gauge 22 are installed at the water inlet 11 of the coal mine underground water reservoir 10. The flow meter 21 can monitor the flow rate of wastewater at the water inlet 11, and the pressure gauge 22 can monitor the pressure at the water inlet 11, thereby determining the silt accumulation status at the water inlet 11, thereby simplifying the monitoring method and achieving accurate monitoring results.

[0032] In this embodiment, when the pressure value at the water inlet 11 of the coal mine underground water reservoir 10 is greater than the preset pressure value and / or the flow value at the water inlet 11 of the coal mine underground water reservoir 10 is less than the preset flow value, it is determined that siltation has occurred at the water inlet 11 of the coal mine underground water reservoir 10, and then it is determined that the siltation parameters do not meet the requirements. Through the above steps, the wastewater flowing into the coal mine underground water reservoir at the water inlet 11 is monitored by using the pressure gauge 22, and the liquid pressure at the water inlet 11 can be measured, and the flow meter 21 is used to monitor the wastewater flow, so that the flow meter 21 and the pressure gauge cooperate with each other to determine the blockage of the water inlet 11. When the pressure value of the water inlet 11 is greater than the preset pressure value and / or the flow value at the water inlet 11 is less than the preset flow value, it is determined that the water inlet 11 is blocked, and the flow meter 21 can monitor that the amount of wastewater entering the coal mine underground water reservoir 10 is reduced, so that the wastewater is blocked at the water inlet 11, and the pressure of the water inlet 11 increases. At this time, it is determined that the silt deposition parameters do not meet the requirements, making the monitoring method simple and accurate.

[0033] In this embodiment, in the step of obtaining silt accumulation parameters at the water inlet 11 and the water outlet 12 of the coal mine underground water reservoir 10, the step of obtaining the silt accumulation parameters at the water outlet 12 of the coal mine underground water reservoir 10 includes obtaining the flow value at the water outlet 12 of the coal mine underground water reservoir 10. Through these steps, the flow value of the water outlet 12 is monitored to determine the impact of silt accumulation on the flow of the water outlet 12. Moreover, the flow value of the water outlet 12 is monitored simultaneously with the monitoring of the water inlet 11, thereby making the monitoring results more accurate.

[0034] In this embodiment, when the flow rate value at the water outlet 12 of the coal mine underground water reservoir 10 decreases by 30% to 50% compared to the initial value of the operation of the coal mine underground water reservoir 10, it is determined that the silt accumulation of the coal mine underground water reservoir 10 affects the use of the coal mine underground water reservoir 10. Through the above steps, when the flow rate value at the water outlet 12 is compared with the initial value of the operation of the coal mine underground water reservoir 10, when the flow rate value at the water outlet 12 decreases by 30% to 50% compared to the initial value of the operation of the coal mine underground water reservoir 10, it is determined that silt accumulation has occurred in the coal mine underground water reservoir 10, and the silt accumulation of the coal mine underground water reservoir 10 has affected the use of the coal mine underground water reservoir 10, and it is determined that the silt accumulation parameters of the coal mine underground water reservoir 10 do not meet the requirements.

[0035] In the embodiment, when the flow value at the outlet 12 of the coal mine underground reservoir 10 decreases by more than 50% compared with the initial value of the coal mine underground reservoir 10, it is determined that the silt accumulation parameter does not meet the requirement. Through the above steps, when the flow value at the outlet 12 of the coal mine underground reservoir 10 decreases by more than 50% compared with the initial value of the coal mine underground reservoir 10, it is further determined that the silt accumulation parameter of the coal mine underground reservoir 10 does not meet the requirement. The flow value at the outlet 12 is monitored, so that the monitoring method is simple and reliable.

[0036] It should be noted that when water flows in the coal mine underground reservoir 10, suspended solids are prone to accumulate, and the water flow rate is affected during the silt accumulation process. Therefore, the flow at the inlet 11 and the outlet 12 of the coal mine underground reservoir 10 needs to be monitored. The flow meter 21 is used for real-time monitoring to ensure the accuracy of the monitoring result, so as to avoid the inlet 11 and the outlet 12 being blocked when the silt accumulation reaches a certain height, thereby affecting the service life of the coal mine underground reservoir.

[0037] The silt accumulation at the outlet 12 affects the water circulation treatment capacity of the coal mine underground reservoir 10. When the water storage capacity of the coal mine underground reservoir 10 increases, the water pressure borne by the coal pillar dam body 13 increases, thereby affecting the service life of the coal mine underground reservoir 10. Therefore, the silt accumulation at the inlet 11 and the outlet 12 is monitored to ensure the accuracy of the monitoring result and avoid safety accidents.

[0038] In the embodiment, after the step of obtaining the silt accumulation parameters at the inlet 11 and the outlet 12 of the coal mine underground reservoir 10, the coal mine underground reservoir life monitoring method further includes:

[0039] The silt accumulation parameters at the inlet 11 and the outlet 12 of the coal mine underground reservoir 10 are verified by geophysical prospecting the silt accumulation area of the coal mine underground reservoir 10. Through the above steps, the silt accumulation area of the coal mine underground reservoir 10 is geophysically prospected, and the silt accumulation parameters of the coal mine underground reservoir 10 are determined through the geophysical prospecting result, so as to ensure the reliability of the monitoring result.

[0040] In the embodiment, the step of verifying the silt accumulation parameters at the inlet 11 and the outlet 12 of the coal mine underground reservoir 10 by geophysically prospecting the silt accumulation area of the coal mine underground reservoir 10 includes:

[0041] The elevation of the water outlet 12 of the coal mine underground water reservoir 10 is set as a first reference line, and a hole is drilled and pumped within a first preset distance from the first reference line to obtain the suspended solids concentration. When the suspended solids concentration is ≥3000 mg / L, it is determined that the silt deposition parameters do not meet the requirements. Through the above steps, a first reference line is set at the water outlet 12 of the coal mine underground water reservoir 10, and a hole is drilled within a first preset distance from the first reference line, so that water in the coal mine underground water reservoir 10 at the first preset distance can be extracted to obtain the suspended solids concentration and determine the silt deposition parameters. When the suspended solids concentration is ≥3000 mg / L, it is determined that the silt deposition parameters do not meet the requirements. The above method and steps are used to extract water through drilling and then detect the suspended solids concentration in the water, so that the detection results are accurate and reliable, and the monitoring method is simple and easy to operate.

[0042] The elevation of the water inlet 11 of the coal mine underground water reservoir 10 is set as a second reference line, and a hole is drilled and pumped within a second preset distance from the second reference line to obtain the suspended matter concentration. When the suspended matter concentration is ≥3000 mg / L, it is determined that the silt deposition parameters do not meet the requirements. Through the above steps, a second reference line is set at the water inlet 11 of the coal mine underground water reservoir 10, and a hole is drilled within the second preset distance of the second reference line, so that water in the coal mine underground water reservoir 10 at the second preset distance can be extracted to obtain the suspended matter concentration and determine the silt deposition parameters. When the suspended matter concentration is ≥3000 mg / L, it is determined that the silt deposition parameters do not meet the requirements. The above method and steps are used to extract water through drilling and then detect the suspended matter concentration in the water, so that the detection results are accurate and reliable, and the monitoring method is simple and easy to operate.

[0043] It should be noted that, by setting a pressure gauge 22 at the water inlet 11 for regular monitoring, when the actual value monitored is greater than the initial operation of the coal mine underground water reservoir 10, it can be determined that siltation has occurred at the water inlet 11; by setting a flow meter 21 at the water inlet 11 for regular monitoring, when the actual value monitored is less than the initial operation of the coal mine underground water reservoir, it can be determined that siltation has occurred at the water inlet 11, and in order to avoid the singleness of the monitoring results and improve the accuracy of the monitoring results, when the pressure gauge 22 and the flow meter 21 monitor abnormal values, geophysical exploration can also be added, by drilling 50 cm below the water inlet 11 and extracting water from the corresponding area for suspended matter monitoring, and drilling 50 cm above the water outlet 12 and extracting water from the corresponding area for suspended matter monitoring, and then the siltation conditions of the water inlet 11 and the water outlet 12 can be further determined, so as to avoid the weakening of the function of the coal mine underground water reservoir 10 due to siltation.

[0044] In this embodiment, in the step of obtaining the silt deposition parameters, water quality parameters, and coal pillar dam parameters of the coal mine underground reservoir 10 in S100, the step of obtaining the coal pillar dam parameters of the coal mine underground reservoir 10 includes:

[0045] Obtaining the strength parameters and fracture development parameters of the coal pillar dam 13 of the coal mine underground water reservoir 10. By using the above steps, by obtaining the strength parameters and fracture development parameters of the coal pillar dam 13 of the coal mine underground water reservoir 10, it is possible to determine the strength and fracture development of the coal pillar dam 13 itself during long-term operation of the coal mine underground water reservoir 10, thereby facilitating the safety of the coal pillar dam 13.

[0046] In this embodiment, in the step of obtaining the coal pillar dam body strength parameter and the coal pillar dam body crack development parameter of the coal mine underground reservoir 10, the step of obtaining the coal pillar dam body strength parameter of the coal mine underground reservoir 10 includes:

[0047] A borehole stress gauge is installed on the coal pillar dam 13 of the coal mine underground water reservoir 10. The borehole stress gauge is used to monitor the stress change value of the coal pillar dam 13 of the coal mine underground water reservoir 10 within a preset time. If the stress change value is greater than the preset stress change range, it is determined that the strength parameters of the coal pillar dam do not meet the requirements, and further, it is determined that the coal pillar dam parameters do not meet the requirements. Using the above steps, by installing a borehole stress gauge on the coal pillar dam 13, the borehole stress gauge can be used to measure the strength parameters of the coal pillar dam and determine the stress change. When the stress change value is greater than the preset stress change range, it is determined that the strength parameters of the coal pillar dam do not meet the requirements. The borehole stress gauge can directly measure the stress change of the coal pillar dam 13, ensuring accurate and reliable results and facilitating monitoring.

[0048] The coal pillar dam 13 of the coal mine underground water reservoir 10 is sampled and rock mechanics tests are carried out to obtain the peak stress of the dam body measured by the test. If the peak stress of the dam body measured by the test is less than the actual monitored stress of the dam body, it is determined that the strength parameters of the coal pillar dam body do not meet the requirements, and further the coal pillar dam body parameters do not meet the requirements. Through the above steps, the coal pillar dam body 13 of the coal mine underground water reservoir 10 is sampled and rock mechanics tests are carried out, so that the peak stress of the coal pillar dam body when it reaches the critical value can be obtained, and the coal mine underground water reservoir 10 is monitored during operation. The actual stress monitored is compared with the peak stress measured by the test. If the actual stress is greater than the peak stress, it is determined that the strength parameters of each injection dam body do not meet the requirements. By monitoring the actual stress of the coal pillar dam body 13, it is possible to determine the operation status of the coal mine underground water reservoir 10 and compare the monitored actual stress with the peak stress, further ensuring the accuracy of the determination result.

[0049] It should be noted that, when conducting rock mechanics tests on the coal pillar dam 13, the stability of the coal pillar dam 13 is determined by the following formula: Among them, the peak stress measured by the test is Fp, the actual stress of the monitored coal pillar dam body 13 is Fa, k is the safety factor, and when the k value is less than 1, it is determined that the actual stress Fa of the coal pillar dam body 13 is greater than the peak stress Fp, and it is determined that the coal pillar dam body 13 is prone to crack development at this time, and then it is determined that the strength of the coal pillar dam body 13 does not meet the requirements.

[0050] In this embodiment, in the step of obtaining the coal pillar dam body strength parameter and the coal pillar dam body fissure development parameter of the coal mine underground reservoir 10, the step of obtaining the coal pillar dam body fissure development parameter of the coal mine underground reservoir 10 includes:

[0051] A strain gauge and a piezometer are installed on the coal pillar dam 13 of the coal mine underground water reservoir 10. The strain gauge and the piezometer are used to obtain the fracture development parameters of the coal pillar dam. If the fracture development parameters of the coal pillar dam are greater than the preset fracture development parameters, it is determined that the fracture development parameters of the coal pillar dam do not meet the requirements, and further, it is determined that the coal pillar dam parameters do not meet the requirements. Through the above steps, a strain gauge and a piezometer are installed on the coal pillar dam 13. The strain gauge monitors the stress changes of the coal pillar dam 13, and the piezometer monitors the osmotic pressure of the coal pillar dam 13. Then, the strain gauge and the piezometer simultaneously monitor the coal pillar dam 13 to obtain the fracture development parameters of the coal pillar dam. When the stress value and the osmotic pressure are greater than the preset values, it is determined that the coal pillar dam parameters do not meet the requirements. With the cooperation of the strain gauge and the piezometer, the monitoring results are accurate, preventing safety accidents.

[0052] Strain gauges are installed on the coal pillar dam 13 of the coal mine underground water reservoir 10, and the strain gauges are used to obtain the initial coal pillar front strain gauge monitoring deformation value P 初1 , Initial coal pillar rear strain gauge monitoring deformation value P 初2 , the deformation value P1 monitored by the strain gauge at the front of the coal pillar during use and the deformation value P2 monitored by the strain gauge at the rear of the coal pillar during use, if The coal pillar dam body fracture development parameters are determined to be unsatisfactory, and further, the coal pillar dam body parameters are determined to be unsatisfactory. Through the above steps, the strain value of the coal pillar dam body 13 is monitored using a strain gauge. When the monitoring index exceeds 1.2, it is determined that the fracture development of the coal pillar dam body 13 is too large, resulting in a safety risk to the coal mine underground water reservoir 10.

[0053] It should be noted that in this embodiment, the strain gauge is a resistance strain gauge. When the coal mine underground water reservoir 10 is in operation, the coal pillar dam 13 is subjected to stress, causing the coal pillar dam 13 to deform. The resistance strain gauge is placed in the front and rear of the coal pillar dam 13, so that when the coal pillar dam 13 is deformed and expanded, the resistance strain gauge is deformed under the action of external force. After the deformation, the structure of the resistance strain gauge will change. The resistance change is converted into an electrical signal through the corresponding measurement circuit, and then the external force is converted into an electrical signal. The above formula is used to compare the crack development before and after development. When the ratio is greater than 1.2, it is determined that the crack development parameters of the coal pillar dam do not meet the requirements.

[0054] In this embodiment, in the step of obtaining silt accumulation parameters, water quality parameters, and coal pillar dam parameters of the coal mine underground water reservoir 10, the step of obtaining the water quality parameters of the coal mine underground water reservoir 10 includes obtaining the suspended matter concentration, total dissolved solids, and total hardness of the water in the coal mine underground water reservoir 10. Through these steps, when monitoring water quality, the water quality parameters obtained include suspended matter concentration, dissolved solids, and total hardness, thereby monitoring water quality from multiple aspects and ensuring accurate and reliable monitoring results.

[0055] It should be noted that wastewater enters the coal mine underground water reservoir 10 through the water inlet 11. The rock mass in the goaf can adsorb ions in the wastewater in the coal mine underground water reservoir 10, thereby naturally purifying the wastewater so that the water can be used for underground production. By monitoring the suspended matter concentration, dissolved solids and total hardness, the coal mine underground water reservoir's wastewater treatment capacity can be determined. When monitoring the water quality, the monitoring cycle can be monitored according to the use time of the coal mine underground water reservoir 10, making the judgment method simple and reliable.

[0056] Among them, total dissolved solids refer to the total amount of all solutes in water, including the content of inorganic and organic matter. Total water hardness mainly refers to the ability of calcium ions and magnesium ions to precipitate soapy water, including carbonate hardness and non-carbonate hardness, making total hardness an important monitoring indicator for determining water quality, and thus able to judge the water quality.

[0057] If the suspended solids concentration is greater than 30 mg / L, the total dissolved solids is greater than 1000 mg / L, and the total hardness is greater than 1000 mg / L, the water quality parameters are determined to be unsatisfactory. Using the above steps, when the suspended solids concentration is greater than 30 mg / L, the total dissolved solids is greater than 1000 mg / L, and the total hardness is greater than 1000 mg / L, it is determined that the coal mine underground water reservoir 10 has reduced its wastewater treatment function, resulting in the coal mine underground water reservoir 10 being unable to function properly and the water discharged from the outlet 12 being unusable. Therefore, it can be determined that the water quality parameters do not meet the requirements.

[0058] The technical solution provided by this embodiment has the following effects:

[0059] (1) By obtaining the silt deposition parameters, water quality parameters and coal pillar dam parameters of the coal mine underground water reservoir 10, the life characteristics of the coal mine underground water reservoir 10 are determined. When the silt deposition parameters, water quality parameters and coal pillar dam parameters do not meet the requirements, it is determined that the coal mine underground water reservoir 10 cannot operate normally, and therefore it is determined that the service life of the coal mine underground water reservoir 10 has ended. A variety of monitoring methods are integrated to measure the various parameters of the coal mine underground water reservoir 10, thereby ensuring the accuracy of the life cycle judgment result of the coal mine underground water reservoir 10, avoiding the limitations of using a single monitoring method, and being able to take corresponding measures in time according to the use of the coal mine underground water reservoir 10, thereby ensuring the safety of the coal mine underground water reservoir 10;

[0060] (2) Monitoring the flow rate of the water outlet 12 to determine the effect of silt accumulation on the flow rate of the water outlet 12, and monitoring the flow rate of the water outlet 12 at the same time as monitoring the water inlet 11, so that the monitoring results are more accurate;

[0061] (3) By obtaining the strength parameters of the coal pillar dam 13 and the crack development parameters of the coal pillar dam of the coal mine underground water reservoir 10, the strength and crack development of the coal pillar dam 13 itself can be determined when the coal mine underground water reservoir 10 is in operation for a long time, thereby facilitating the guarantee of the safety of the coal pillar dam 13.

[0062] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0063] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0064] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0065] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0066] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0067] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for monitoring the life of underground water reservoirs in coal mines, characterized in that: The coal mine underground reservoir life monitoring method comprises: Obtaining silt deposition parameters, water quality parameters, and coal pillar dam parameters of the coal mine underground reservoir (10); Comparing the silt deposition parameters with preset silt deposition parameters, comparing the water quality parameters with preset water quality parameters, and comparing the coal pillar dam parameters with preset coal pillar dam parameters; When the silt deposition parameters, the water quality parameters, and the coal pillar dam parameters all fail to meet the requirements, determining that the service life of the coal mine underground water reservoir (10) has ended; In the step of obtaining the silt deposition parameters, the water quality parameters, and the coal pillar dam body parameters of the coal mine underground water reservoir (10), the step of obtaining the coal pillar dam body parameters of the coal mine underground water reservoir (10) includes: obtaining the coal pillar dam body strength parameters and the coal pillar dam body crack development parameters of the coal mine underground water reservoir (10); In the step of obtaining the coal pillar dam body strength parameter and the coal pillar dam body fissure development parameter of the coal mine underground water reservoir (10), the step of obtaining the coal pillar dam body fissure development parameter of the coal mine underground water reservoir (10) comprises: Installing a strain gauge and a piezometer on the coal pillar dam body (13) of the coal mine underground water reservoir (10), and using the strain gauge and the piezometer to obtain the fracture development parameter of the coal pillar dam body, if the fracture development parameter of the coal pillar dam body is greater than a preset fracture development parameter, then determining that the fracture development parameter of the coal pillar dam body does not meet the requirements, and further determining that the coal pillar dam body parameters do not meet the requirements; and / or, A strain gauge is installed on the coal pillar dam (13) of the coal mine underground water reservoir (10), and the strain gauge is used to obtain the initial coal pillar front strain gauge monitoring deformation value , Initial coal pillar rear strain gauge monitoring deformation value , The strain gauge at the front of the coal pillar monitors the deformation value during use And the deformation value monitored by the strain gauge at the rear of the coal pillar during use ,like , it is determined that the coal pillar dam body crack development parameters do not meet the requirements, and further it is determined that the coal pillar dam body parameters do not meet the requirements.

2. The coal mine underground reservoir life monitoring method according to claim 1, characterized in that: In the step of obtaining the silt deposition parameters, the water quality parameters, and the coal pillar dam parameters of the coal mine underground water reservoir (10), the step of obtaining the silt deposition parameters of the coal mine underground water reservoir (10) includes: Obtain silt deposition parameters at the water inlet (11) and the water outlet (12) of the coal mine underground water reservoir (10).

3. The coal mine underground reservoir life monitoring method according to claim 2, characterized in that: In the step of obtaining the silt deposition parameters at the water inlet (11) and the water outlet (12) of the coal mine underground water reservoir (10), the step of obtaining the silt deposition parameters at the water inlet (11) of the coal mine underground water reservoir (10) includes obtaining a pressure value and a flow value at the water inlet (11) of the coal mine underground water reservoir (10); When the pressure value at the water inlet (11) of the coal mine underground water reservoir (10) is greater than a preset pressure value and / or the flow value at the water inlet (11) of the coal mine underground water reservoir (10) is less than a preset flow value, it is determined that silt accumulation occurs at the water inlet (11) of the coal mine underground water reservoir (10), and further it is determined that the silt accumulation parameter does not meet the requirements.

4. The method for monitoring the life of underground water reservoirs in coal mines according to claim 2, characterized in that: In the step of obtaining the silt deposition parameters at the water inlet (11) and the water outlet (12) of the coal mine underground water reservoir (10), the step of obtaining the silt deposition parameters at the water outlet (12) of the coal mine underground water reservoir (10) includes obtaining a flow rate value at the water outlet (12) of the coal mine underground water reservoir (10); When the flow rate value at the water outlet (12) of the coal mine underground water reservoir (10) decreases by 30% to 50% compared with the initial value of the operation of the coal mine underground water reservoir (10), it is determined that the siltation of the coal mine underground water reservoir (10) affects the use of the coal mine underground water reservoir (10); When the flow rate value at the water outlet (12) of the coal mine underground water reservoir (10) decreases by more than 50% compared with the initial value of the operation of the coal mine underground water reservoir (10), it is determined that the silt deposition parameter does not meet the requirements.

5. The coal mine underground reservoir life monitoring method according to claim 2, characterized in that: After the step of obtaining the silt deposition parameters at the water inlet (11) and the water outlet (12) of the coal mine underground water reservoir (10), the coal mine underground water reservoir life monitoring method further comprises: A geophysical survey is conducted on the siltation area of ​​the coal mine underground water reservoir (10), and the siltation parameters at the water inlet (11) and the water outlet (12) of the coal mine underground water reservoir (10) are verified using the geophysical survey results.

6. The method for monitoring the life of underground water reservoirs in coal mines according to claim 5, characterized in that: The steps of conducting geophysical exploration on the siltation area of ​​the coal mine underground water reservoir (10) and verifying the siltation parameters at the water inlet (11) and the water outlet (12) of the coal mine underground water reservoir (10) using the geophysical exploration results include: The elevation of the water outlet (12) of the coal mine underground water reservoir (10) is set as a first reference line, a hole is drilled within a first preset distance from the first reference line and water is pumped to obtain the suspended matter concentration, and when the suspended matter concentration is ≥3000 mg / L, it is determined that the silt deposition parameter does not meet the requirements; and / or, The elevation of the water inlet (11) of the coal mine underground water reservoir (10) is set as a second reference line, a hole is drilled within a second preset distance from the second reference line and water is pumped to obtain the suspended matter concentration. When the suspended matter concentration is ≥3000 mg / L, it is determined that the silt deposition parameter does not meet the requirements.

7. The coal mine underground reservoir life monitoring method according to claim 1, characterized in that: In the step of obtaining the coal pillar dam body strength parameter and the coal pillar dam body crack development parameter of the coal mine underground reservoir (10), the step of obtaining the coal pillar dam body strength parameter of the coal mine underground reservoir (10) includes: A borehole stress gauge is installed on the coal pillar dam (13) of the coal mine underground reservoir (10), and the stress change value of the coal pillar dam (13) of the coal mine underground reservoir (10) within a preset time is monitored by the borehole stress gauge. If the stress change value is greater than a preset stress change range, it is determined that the strength parameter of the coal pillar dam does not meet the requirements, and further it is determined that the parameters of the coal pillar dam do not meet the requirements; and / or, The coal pillar dam body (13) of the coal mine underground water reservoir (10) is sampled and subjected to rock mechanics testing to obtain the peak stress of the dam body measured by the test. If the peak stress of the dam body measured by the test is less than the actual monitored stress of the dam body, it is determined that the strength parameters of the coal pillar dam body do not meet the requirements, and further it is determined that the parameters of the coal pillar dam body do not meet the requirements.

8. The method for monitoring the life of underground water reservoirs in coal mines according to claim 1, characterized in that: In the step of obtaining the silt deposition parameters, the water quality parameters, and the coal pillar dam parameters of the coal mine underground water reservoir (10), the step of obtaining the water quality parameters of the coal mine underground water reservoir (10) includes obtaining the suspended matter concentration, the total dissolved solids, and the total hardness of the water quality of the coal mine underground water reservoir (10); If the suspended matter concentration is greater than 30 mg / L, the total dissolved solids are greater than 1000 mg / L, and the total hardness is greater than 1000 mg / L, it is determined that the water quality parameters do not meet the requirements.

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