A mine gushing water precursor information monitoring and early warning device and method

Abstract

The application discloses a kind of coal mine gushing water precursor information monitoring early warning device and method, the device includes: monitoring probe system, hole sealing system, data processing and display system, external gas supply and control system.The application can judge whether there is gushing water precursor in borehole according to the data of monitoring integrated device, can monitor the fissure development position inside engineering body and whether it communicates water-bearing body in real time;Avoid the large amount of repeated detection work such as previous multiple borehole detection, geophysical prospecting;Simple operation, strong applicability, strong generalizability, can be widely applied to mine exploitation, reservoir dam body, tailing pond dam body, tunnel and so on gushing water monitoring.

Description

Technical Field

[0001] This invention relates to the field of mine water inrush monitoring technology, specifically to a device and method for monitoring and early warning of precursor information of coal mine water inrush. Background Technology

[0002] Water inrushes in engineering projects (such as mine inrushes, tunnel inrushes, and dam failures) can cause enormous loss of life and property. Mine water inrushes, as one of the five major hazards in mining, have always threatened safe mining production and are a major source of injury and death among miners. Because the effects and constraints of water inrushes are extremely complex, many factors are not only difficult to determine but also difficult to detect in advance. Therefore, accurate and timely detection is a crucial means of water inrush prevention and control, and obtaining early warning information about water inrushes based on detection is the key and core of water inrush prevention and control.

[0003] To mitigate or reduce losses caused by sudden water inrushes, domestic and international experts and scholars have conducted extensive scientific and technological research, developing control measures such as advanced detection, drainage and pressure reduction, and grouting curtains. They have also proposed advanced detection technologies such as geophysical exploration and drilling, which have reduced the probability of sudden water inrushes and the frequency of such events in coal mine production to some extent. However, existing monitoring methods all have limitations. For example, geophysical exploration results are transient and cannot continuously detect the danger of sudden water inrushes over long periods. Drilling methods rely on extensive engineering monitoring methods, increasing the workload and financial investment, and still suffer from inaccurate detection. In reality, there are many precursory indicators that can be utilized when a sudden water inrush occurs, such as increased humidity in the coal face, decreased temperature, increased roof pressure, or floor heave. Based on this, this patent integrates multi-parameter monitoring technologies and principles, including optical monitoring, temperature monitoring, and image recognition, to comprehensively analyze the precursory information of sudden water inrushes, providing accurate monitoring methods and information for water control in mines, tunnels, reservoir dams, and other water conservancy projects and underground engineering projects. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a monitoring and early warning device and method for coal mine water inrush precursor information, which provides reliable precursor information for water inrush disasters and ensures safe production in mining, tunnel and other engineering activities.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution: a coal mine water inrush precursor information monitoring and early warning device, comprising: a monitoring probe system, a sealing system, a data processing and display system, and an external gas supply and control system;

[0006] The monitoring probe system includes a heating device, an integrated monitoring device fitted at the front end of the heating device, and a borehole camera at the front end of the heating device;

[0007] The sealing system includes a sealing device and a check valve. The sealing device is equipped with a pressure sensor on its surface. The sealing device has three pre-set through holes: a main hole, an exhaust hole, and an air inlet hole. The exhaust hole is connected to the check valve through a pipeline.

[0008] The external gas supply and control system includes a gas cylinder, which is connected to the gas inlet via a pipeline. The pipeline is equipped with a main gas valve, a pressure and flow meter, and a gas distribution valve at the end closest to the gas cylinder.

[0009] The data processing and display system includes a data integration and processing computer and a handheld display. The data integration and processing computer is connected to the monitoring probe system via a bus, which passes through the bus hole of the sealing system. The handheld display is connected to the data integration and processing computer via a signal connection.

[0010] Preferably, the monitoring integration device includes an infrared camera, a water molecule concentration monitor, a temperature monitor, a gas pressure monitor, an H2S concentration monitor, and a gas concentration monitor, all connected to a bus. The monitoring integration device is hexagonal prism-shaped, with the infrared camera, water molecule concentration monitor, temperature monitor, gas pressure monitor, H2S concentration monitor, and gas concentration monitor each located on one side of the hexagonal prism. The heating device is cylindrical, consisting of a heating wire, a heat insulation layer, and a wiring channel from the outside to the inside, with the bus placed inside the wiring channel.

[0011] Preferably, the sealing device is made of a water-swellable material.

[0012] This invention also proposes a method for monitoring and early warning of precursor information of coal mine water inrush, comprising the following steps:

[0013] S1: Drill holes of different depths on the surface of the object being monitored;

[0014] S2: A monitoring probe system is placed at the bottom of each borehole, and a sealing system of appropriate length is selected according to the borehole depth. The sealing system is prefabricated according to the length of the borehole and ensures that the monitoring probe system has enough space inside the borehole.

[0015] S3: The borehole is sealed by the expansion of the sealing device itself, and the stress sensor is kept in close contact with the inner wall of the borehole. The pressure value F1 is recorded at this time.

[0016] S4: Inspect the sealing effect;

[0017] S5: Open the main gas valve, the distribution gas valve, and the check valve. Use the heating device to heat the borehole, causing the liquid water inside to turn into gaseous water and be discharged through the check valve until the water molecule concentration monitor displays 0, ensuring that all water molecules in the borehole have been discharged. Record the water molecule concentration at this point as the initial water molecule concentration N. 初 ;

[0018] S6: Close the gas distribution valve and check valve. At this time, the values ​​displayed by the pressure monitor and temperature monitor are recorded as the initial gas pressure P. 初1 Initial temperature T 初1 And record the air pressure from the initial air pressure P 初1 Reduced to stable air pressure P 初2 Required time ΔH 初1 The temperature is determined by the initial temperature T. 初1 Reduced to a stable temperature T 初2 Required time ΔH 初2 ;

[0019] S7: When the borehole temperature drops to a stable level, use a heating device to heat the borehole back to its initial temperature, and record this temperature as T. 测1 T 测1 =T 初1 Simultaneously, maintain the air pressure at the initial air pressure and record this air pressure as P. 测1 P 测1 =P 初1 Record the time ΔH required for the air pressure to drop to a stable air pressure and the temperature to drop to a stable temperature, respectively. 测1 ΔH 测2 ;

[0020] S8: Repeat step S7 and record the data from the monitoring integrated device simultaneously; determine whether there are any signs of a sudden water inrush in the borehole based on the data from the monitoring integrated device.

[0021] Preferably, the criteria for determining whether there are precursors to a sudden water inrush are as follows:

[0022] The presence of any one or more of the following conditions indicates an impending water inrush:

[0023] Pressure drop coefficient Pressure drop coefficient in the initial stage By comparison, the coefficient of change of sudden water pressure was obtained. When K P <K P *time, K P * represents the preset critical surge water pressure change coefficient, proving the presence of cracks; temperature drop coefficient. Temperature drop coefficient in the initial stage By comparison, the coefficient of temperature change of the inrush water was obtained. When the coefficient K T <K T *, K T * represents the preset critical temperature change coefficient for sudden water inrush, proving that a sudden drop in temperature has occurred; the presence of cracks and a sudden drop in temperature indicate a precursor to a sudden water inrush.

[0024] When the water molecule concentration N is measured in real time 测Greater than the initial water molecule concentration N 初 If there is a crack connecting the borehole to the water body, it is considered a precursor to a sudden water inrush.

[0025] When H2S gas is detected, it indicates the presence of old water near the monitoring location, which is considered a precursor to a sudden water inrush.

[0026] When an increase in pressure or an abnormal infrared signal is detected, it is determined that a sudden water inrush is imminent.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] This invention integrates multiple parameters, including the pressure change coefficient of the inrush water, the temperature change coefficient of the inrush water, water molecule concentration, H2S gas concentration, pressure, and infrared signals, to more accurately and proactively perceive basic information before the occurrence of inrush water. It can monitor the location of internal fractures and whether they connect to aquatic bodies in real time, avoiding the need for extensive and repetitive drilling and geophysical exploration. It is simple to operate, highly applicable, and widely applicable to inrush water monitoring in mining, reservoir dams, tailings dams, tunnels, and other applications. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a coal mine water inrush warning and monitoring device.

[0031] Figure 2 for Figure 1 Cross-sectional view in the AA direction.

[0032] Figure 3 for Figure 1 Cross-sectional view in the BB direction.

[0033] Figure 4 for Figure 1 Cross-sectional view in the CC direction.

[0034] Figure 5 A schematic diagram of the on-site layout of a monitoring and early warning device for precursor information of sudden water inrush in a coal mine.

[0035] In the diagram: 1-Monitoring integration device; 1.1-Infrared camera; 1.2-Water molecule concentration monitor; 1.3-Temperature monitor; 1.4-Gas pressure monitor; 1.5-H2S concentration monitor; 1.6-Gas concentration monitor; 2-Borehole camera; 3-Heating device; 3.1-Heating wire; 3.2-Insulation layer; 3.3-Line channel; 4-Bus port; 5-Sealer; 6-Exhaust port; 7-Check valve; 8-Air inlet; 9-Gas distribution valve; 10-Pressure and flow meter; 11-Main gas valve; 12-Gas cylinder; 13.1-Data integration and processing computer; 13.2-Handheld display; 14-Bus; 15-Pressure sensor; 16-Monitored object; 17-Borehole. Detailed Implementation

[0036] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0037] A coal mine water inrush precursor information monitoring and early warning device includes: a monitoring probe system, a sealing system, a data processing and display system, and an external gas supply and control system;

[0038] The monitoring probe system includes a heating device 3, a monitoring integration device 1 is sleeved at the front end of the heating device 3, and a drilling camera 2 is located at the front end of the heating device 3; the drilling camera 2 is located at the front end of the monitoring integration device 1.

[0039] The sealing system includes a sealing device 5 and a check valve 7. The sealing device 5 is made of a water-swellable material. A pressure sensor 15 is provided on the surface of the sealing device 5. The sealing device 5 has three pre-set through holes: a main hole 4, an exhaust hole 6, and an air inlet hole 8. The exhaust hole 6 is connected to the check valve 7 through a pipeline.

[0040] The external gas supply and control system includes a gas cylinder 12, which is connected to the air inlet 8 via a pipeline. The pipeline near the gas cylinder 12 is equipped with a main gas valve 11, a pressure and flow meter 10, and a gas distribution valve 9 in sequence.

[0041] The data processing and display system includes a data integration and processing computer 13.1 and a handheld display 13.2. The data integration and processing computer 13.1 is connected to the monitoring probe system via a bus 14, which passes through the bus hole 4 of the sealing system. The handheld display 13.2 is connected to the data integration and processing computer 13.1 via a signal.

[0042] The monitoring integration device 1 includes an infrared camera 1.1, a water molecule concentration monitor 1.2, a temperature monitor 1.3, a gas pressure monitor 1.4, an H2S concentration monitor 1.5, and a gas concentration monitor 1.6, all connected to the bus 14. The monitoring integration device 1 is hexagonal prism-shaped, with the infrared camera 1.1, water molecule concentration monitor 1.2, temperature monitor 1.3, gas pressure monitor 1.4, H2S concentration monitor 1.5, and gas concentration monitor 1.6 each located on one side of the hexagonal prism. The heating device 3 is cylindrical, consisting of a heating wire 3.1, a heat insulation layer 3.2, and a wiring channel 3.3, arranged sequentially from the outside to the inside. The bus 14 is located within the wiring channel 3.3.

[0043] This invention also provides a method for monitoring and early warning of precursor information of coal mine water inrush, comprising the following steps:

[0044] S1: Drill holes 17 of different depths are arranged on the surface of the monitored object 16;

[0045] S2: A monitoring probe system is placed at the bottom of each borehole 17, and a sealing system of appropriate length is selected according to the depth of borehole 17. The sealing system is prefabricated according to the length of borehole 17 and ensures that the monitoring probe system has sufficient space in borehole 17.

[0046] S3: The borehole 17 is sealed by the expansion of the sealing device 5 itself, and the stress sensor 15 is kept in close contact with the inner wall of the borehole 17. The pressure value F1 is recorded at this time.

[0047] S4: Check the sealing effect; open the main air valve 11 and the branch air valve 9, and check whether the borehole sealing effect is good by measuring the changes in pressure and flow rate 10.

[0048] S5: Open the main gas valve 11, the distribution gas valve 9, and the check valve 7. Use the heating device 3 to heat the borehole to 30-50℃, causing the liquid water in the borehole to turn into gaseous water and be discharged from borehole 17 through the check valve 7, until the water molecule concentration monitor 1.2 displays 0, ensuring that all water molecules in borehole 17 have been discharged from borehole 17; record the water molecule concentration at this time as the initial water molecule concentration N. 初 ;

[0049] S6: Close the gas distribution valve 9 and check valve 7. At this time, the values ​​displayed by the pressure monitor 1.4 and the temperature monitor 1.3 are recorded as the initial gas pressure P. 初1 Initial temperature T 初1 And record the air pressure from the initial air pressure P 初1 Reduced to stable air pressure P 初2 Required time ΔH 初1 The temperature is determined by the initial temperature T. 初1 Reduced to a stable temperature T 初2 Required time ΔH 初2Stable air pressure refers to the air pressure at which the value of barometer 1.4 no longer changes; stable temperature refers to the temperature at which the value of temperature monitor 1.3 no longer changes.

[0050] S7: When the temperature inside the borehole drops to a stable temperature, the borehole 17 is heated using the heating device 3 until the temperature reaches the initial temperature, and this temperature is recorded as T. 测1 T 测1 =T 初1 Simultaneously, maintain the air pressure at the initial air pressure and record this air pressure as P. 测1 P 测1 =P 初1 Record the time ΔH required for the air pressure to drop to a stable air pressure and the temperature to drop to a stable temperature, respectively. 测1 ΔH 测2 ;

[0051] S8: Repeat step S7 and record the data of the monitoring integrated device 1 simultaneously; determine whether there are any signs of a sudden water inrush in borehole 17 based on the data of the monitoring integrated device 1.

[0052] The criteria for determining whether there are precursors to a sudden water inrush are as follows:

[0053] The presence of any one or more of the following conditions indicates an impending water inrush:

[0054] Pressure drop coefficient Pressure drop coefficient in the initial stage By comparison, the coefficient of change of sudden water pressure was obtained. When K P <K P *time, K P * represents the preset critical surge water pressure change coefficient, proving the presence of cracks; temperature drop coefficient. Temperature drop coefficient in the initial stage By comparison, the coefficient of temperature change of the inrush water was obtained. When the coefficient K T <K T *, K T * represents the preset critical temperature change coefficient for sudden water inrush, proving that a sudden drop in temperature has occurred; the presence of cracks and a sudden drop in temperature indicate a precursor to a sudden water inrush.

[0055] When the water molecule concentration N is measured in real time 测 Greater than the initial water molecule concentration N 初 If there is a crack connecting the borehole to the water body, it is considered a precursor to a sudden water inrush.

[0056] When H2S gas is detected, it indicates the presence of old water near the monitoring location, which is considered a precursor to a sudden water inrush.

[0057] When an increase in pressure or an abnormal infrared signal is detected, it is determined that a sudden water inrush is imminent.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A monitoring and early warning device for precursor information of sudden water inrush in coal mines, characterized in that, include: Monitoring probe system, sealing system, data processing and display system, external air supply and control system; The monitoring probe system includes a heating device (3), a monitoring integration device (1) is sleeved at the front end of the heating device (3), and a drilling camera (2) is provided at the front end of the heating device (3). The sealing system includes a sealing device (5) and a check valve (7); the sealing device (5) is equipped with a pressure sensor (15) on its surface. The sealing device (5) has three through holes: a main bus hole (4), an exhaust hole (6) and an air inlet hole (8). The exhaust hole (6) is connected to the check valve (7) through a pipeline. The external gas supply and control system includes a gas cylinder (12), which is connected to the air inlet (8) through a pipeline. The pipeline is provided with a main gas valve (11), a pressure and flow meter (10), and a gas distribution valve (9) at the end near the gas cylinder (12). The data processing and display system includes a data integration and processing computer (13.1) and a handheld display (13.2). The data integration and processing computer (13.1) is connected to the monitoring probe system via a bus (14). The bus (14) passes through the bus hole (4) of the sealing system. The handheld display (13.2) is connected to the data integration and processing computer (13.1) via a signal.

2. The coal mine water inrush precursor information monitoring and early warning device according to claim 1, characterized in that, The monitoring integration device (1) includes an infrared camera (1.1), a water molecule concentration monitor (1.2), a temperature monitor (1.3), a gas pressure monitor (1.4), an H2S concentration monitor (1.5), and a gas concentration monitor (1.6), which are respectively connected to the bus (14). The monitoring integration device (1) is a hexagonal prism, and the infrared camera (1.1), water molecule concentration monitor (1.2), temperature monitor (1.3), gas pressure monitor (1.4), H2S concentration monitor (1.5), and gas concentration monitor (1.6) are respectively located on one side of the hexagonal prism. The heating device (3) is cylindrical, and from the outside to the inside are a heating wire (3.1), a heat insulation layer (3.2), and a circuit channel (3.3). The bus (14) is placed in the circuit channel (3.3).

3. The coal mine water inrush precursor information monitoring and early warning device according to claim 1, characterized in that, The sealing device (5) is made of a water-swellable material.

4. A method for monitoring and early warning of precursor information of coal mine water inrush using the apparatus described in any one of claims 1-3, characterized in that, Includes the following steps: S1: Drill holes (17) of different depths are arranged on the surface of the monitored object (16). S2: A monitoring probe system is placed at the bottom of each borehole (17), and a sealing system of appropriate length is selected according to the depth of the borehole (17). The sealing system is prefabricated according to the length of the borehole (17) and ensures that the monitoring probe system has enough space in the borehole (17). S3: The borehole (17) is sealed by the expansion of the sealing device (5), and the pressure sensor (15) is kept in close contact with the inner wall of the borehole (17). The pressure value at this time is recorded. F 1; S4: Inspect the sealing effect; S5: Open the main gas valve (11), the distribution gas valve (9), and the check valve (7). Use the heating device (3) to heat the borehole, so that the liquid water in the borehole becomes gaseous water and is discharged from the borehole (17) through the check valve (7) until the water molecule concentration monitor (1.2) shows 0, that is, to ensure that all water molecules in the borehole (17) are discharged from the borehole (17); record the water molecule concentration at this time as the initial water molecule concentration. N 初 ; S6: Close the gas distribution valve (9) and check valve (7). At this time, the values ​​displayed by the pressure monitor (1.4) and temperature monitor (1.3) are recorded as the initial gas pressure P. 初1 Initial temperature T 初1 And record the air pressure from the initial air pressure P 初1 Reduced to stable air pressure P 初2 Required time ΔH 初1 The temperature is determined by the initial temperature T. 初1 Reduced to a stable temperature T 初2 Required time ΔH 初2 ; S7: When the temperature inside the borehole drops to a stable temperature, the borehole (17) is heated using the heating device (3) until the temperature reaches the initial temperature, and this temperature is recorded as T. 测1 T 测1 =T 初1 Simultaneously, maintain the air pressure at the initial air pressure and record this air pressure as P. 测1 P 测1 =P 初1 Record the time ΔH required for the air pressure to drop to a stable air pressure and the temperature to drop to a stable temperature, respectively. 测1 ΔH 测2 ; S8: Repeat step S7 and record the data of the monitoring integrated device (1) simultaneously; determine whether there are any signs of sudden water inrush in the borehole (17) based on the data of the monitoring integrated device (1).

5. The method for monitoring and early warning of precursor information of coal mine water inrush as described in claim 4, characterized in that, The criteria for determining whether there are precursors to a sudden water inrush are as follows: The presence of any one or more of the following conditions indicates an impending water inrush: Pressure drop coefficient Pressure drop coefficient in the initial stage By comparison, the coefficient of change of sudden water pressure was obtained. When K P <K P *time, K P * represents the preset critical surge water pressure change coefficient, proving the presence of cracks; temperature drop coefficient. Temperature drop coefficient in the initial stage By comparison, the coefficient of temperature change of the inrush water was obtained. When the coefficient K T <K T *, K T * represents the preset critical temperature change coefficient for sudden water inrush, proving that a sudden drop in temperature has occurred; the presence of cracks and a sudden drop in temperature indicate a precursor to a sudden water inrush. When the water molecule concentration N is measured in real time 测 Greater than the initial water molecule concentration N 初 If there is a crack connecting the borehole and the water body, it is considered a precursor to a sudden water inrush. When H2S gas is detected, it indicates the presence of old water near the monitoring location, which is considered a precursor to a sudden water inrush. When an increase in pressure or an abnormal infrared signal is detected, it is determined that a sudden water inrush is imminent.

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