Wireless mine pressure monitoring system

Abstract

The invention relates to the technical field of mining safety, in particular to a wireless mine pressure monitoring system which comprises a ground control subsystem and an underground data collecting and early warning subsystem, and the underground data collecting and early warning subsystem comprises a plurality of wireless data collectors, a mining roadway wireless data collecting unit and a gob-side entry retaining wireless data collecting unit; wireless roof detection mechanisms are arranged in the mining roadway wireless data acquisition unit and the gob-side entry retaining wireless data acquisition unit, each wireless roof detection mechanism comprises a longitudinal wireless detection assembly and a point wireless detection assembly, and a plurality of wireless data acquisition units communicate with a ground control subsystem through acquisition substations. According to the wireless mine pressure monitoring system, the wireless roof detection mechanism comprises the longitudinal wireless detection assembly and the point wireless detection assembly, detection of a roadway roof is achieved, monitoring of the roof in a large range of a roadway is achieved, and the detection precision of the point wireless detection assembly is improved.

Description

Technical Field

[0001] This invention relates to the field of mining safety technology, and in particular to a wireless mine pressure monitoring system. Background Technology

[0002] Mine pressure monitoring is a core component of ensuring safe production in underground mines. Its core objective is to capture real-time changes in key parameters such as surrounding rock stress, roof displacement, and anchor bolt (cable) loads, providing early warnings of safety risks such as roof collapse and surrounding rock instability. Current technologies utilize wireless sensor technology for roadway monitoring, employing multi-point detection methods. Existing roof monitoring uses delamination sensors, but variations in internal baselines significantly reduce overall delamination detection accuracy, making high-precision detection of specific detection points impossible. Furthermore, while multi-point detection is used, it cannot cover the entire roof, whereas full-coverage sensors result in long installation periods and high costs. Summary of the Invention

[0003] The purpose of this invention is to provide a wireless mine pressure monitoring system to solve the above-mentioned technical problems.

[0004] To achieve the above objectives, the present invention provides a wireless mine pressure monitoring system, including a ground control subsystem and an underground data acquisition and early warning subsystem. The underground data acquisition and early warning subsystem includes several wireless data acquisition units, a wireless data acquisition unit for mining roadways, and a wireless data acquisition unit for goaf retention roadways. The wireless data acquisition units for mining roadways and the wireless data acquisition units for goaf retention roadways communicate with their respective wireless data acquisition units. Both the wireless data acquisition unit for the mining roadway and the wireless data acquisition unit for the goaf retention roadway are equipped with a wireless roof detection mechanism. The wireless roof detection mechanism includes a longitudinal wireless detection component and a point wireless detection component. Both the longitudinal wireless detection component and the point wireless detection component communicate with the corresponding wireless data acquisition unit. Several wireless data acquisition units communicate with the ground control subsystem through the acquisition substation.

[0005] Preferably, the wireless data acquisition unit for the mining roadway includes a longitudinal wireless detection component, a point wireless detection component, a wireless borehole stress sensor, and a wireless anchor cable sensor. The longitudinal wireless detection component and the point wireless detection component are used to detect the deformation of the top plate, and the point wireless detection component adopts a wireless delamination sensor. Wireless borehole stress sensors are used to detect changes in surrounding rock stress. Wireless anchor cable sensors are used to detect changes in anchor cable stress. The longitudinal wireless detection component, wireless delamination sensor, wireless borehole stress sensor, and wireless anchor cable sensor communicate wirelessly with their corresponding wireless data acquisition units via a star connection. Multiple wireless data acquisition units communicate wirelessly via a chain communication mode.

[0006] Preferably, the wireless data acquisition unit along the goaf includes a longitudinal wireless detection component, a point wireless detection component, a wireless pressure sensor, a wireless distance sensor, a wireless borehole stress sensor, a wireless anchor cable sensor, and a wireless tilt sensor. Wireless pressure sensors are used to detect pressure values ​​in the top and side supports; Wireless distance sensors are used to detect the distance between the two sides of the goaf. Wireless tilt sensors are used to detect the tilt angle of the support structure; The longitudinal wireless detection component, wireless delamination sensor, wireless borehole stress sensor, wireless tilt sensor, wireless pressure sensor, wireless distance sensor, and wireless anchor cable sensor communicate wirelessly with their corresponding wireless data acquisition units via a star connection. Multiple wireless data acquisition units communicate wirelessly via a chain communication mode.

[0007] Preferably, the longitudinal wireless detection component includes two mounting components arranged longitudinally. Each mounting component is equipped with a fixed shaft and a rotating shaft arranged in parallel. The rotating shaft is connected to a wireless encoder. Both the fixed shaft and the rotating shaft have fixed through holes. One end of several parallel sensing ropes is fixed to the fixed through hole of the fixed shaft of one of the mounting components, and the other end of several parallel sensing ropes is fixed to the fixed through hole of the rotating shaft of the other mounting component. The sensing ropes are in contact with the top plate. The wireless encoder communicates with the corresponding data acquisition unit. The formula for calculating the total longitudinal top plate deformation rate is as follows: ; in, This represents the total longitudinal top plate deformation rate. To be in the time interval Maximum deformation of the inner top plate. The calculation formula is as follows: ; in, The spacing between the fixed and rotating axes on adjacent mounting components. The change in the length of the sensing rope collected by the wireless encoder.

[0008] Preferably, the point wireless detection component includes an installation component, on which a wireless delamination sensor and a wireless compensation distance sensor are installed. The wireless delamination sensor includes a T-shaped sleeve, in which a first steel strand and a second steel strand are installed. One end of the first steel strand and the second steel strand are respectively fixed in rock strata at different heights within the top plate. The other ends of the first steel strand and the second steel strand are respectively installed in the horizontal tube of the T-shaped sleeve as a first slider and a second slider. The two ends of the horizontal tube are provided with a first wireless distance sensor and a second wireless distance sensor, which are respectively positioned opposite to the first slider and the second slider. The wireless compensation distance sensor is mounted on the mounting assembly via an extension plate and is positioned opposite to the vertical tube of the T-shaped sleeve; The first wireless distance sensor, the second wireless distance sensor, and the wireless compensation distance sensor all communicate with the same data acquisition unit. The formula for calculating the deformation rate of the surrounding rock at the point based on the data from the first wireless distance sensor, the second wireless distance sensor, and the wireless compensation distance sensor is as follows: ; in, Let the deformation rate of the surrounding rock be the point. and Divided into time intervals The first and second distance changes within the range, To compensate for changes in distance.

[0009] Preferably, the delamination safety factor is calculated using the point surrounding rock deformation rate and the total longitudinal roof deformation rate, as shown in the following formula: ; in, For the delamination safety factor, This is the safety ratio coefficient for delamination. and These are the weighting coefficients for longitudinal deformation and point deformation, respectively. It is the unit deformation rate.

[0010] Preferably, the stress disturbance coefficient is calculated based on the data from the wireless borehole stress sensor, using the following formula: ; in, The stress disturbance coefficient is... Real-time stress collected by a wireless borehole stress sensor. Given the initial stress, the stress perturbation coefficient is normalized to obtain the processed stress perturbation coefficient. , .

[0011] Preferably, the support safety factor is calculated based on data from the wireless borehole stress sensor and the wireless anchor cable sensor, using the following formula: ; in, To ensure the safety factor of the support, This refers to the number of anchor cables per unit length. For the anchor bolt installation angle, The elastic modulus of the anchor cable. The cross-sectional area of ​​the anchor cable is... For the strain force of the anchor cable, For unit length, The width of the alleyway.

[0012] The preferred formula for calculating the safety factor of the mining roadway is as follows: ; in, This is the safety factor for the mining roadway.

[0013] The preferred formula for calculating the safety factor of the roadway retention is as follows: ; in, To ensure the safety factor of the roadway along the goaf, The safety factor for roadway support along the goaf is calculated using the following formula: ; in, A pressure correction factor that is positively correlated with the pressure values ​​of the top and side supports; the pressure correction factor is greater than 1. This is a gap correction coefficient related to the rate of change of the gap between the two sides; This is the coefficient of the rate of change of the tilt angle of the support after normalization.

[0014] Therefore, the wireless mine pressure monitoring system described above has the following advantages: the wireless roof detection mechanism of this application includes a longitudinal wireless detection component and a point wireless detection component, which realizes the detection of the roadway roof, realizes the monitoring of the roof over a large area of ​​the roadway, and improves the detection accuracy of the point wireless detection component.

[0015] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a wireless mine pressure monitoring system according to the present invention; Figure 2 This is a schematic diagram of the longitudinal wireless detection component structure of the present invention; Figure 3 This is a schematic diagram of the pressure shaft assembly structure of the present invention; Figure 4 This is a schematic diagram of the changes in the sensing rope; Figure 5 This is a schematic diagram of a T-shaped sleeve structure.

[0017] Figure Labels 1. Mounting assembly; 2. Fixed shaft; 3. Rotating shaft; 4. Fixed through hole; 5. Induction rope; 6. Wireless encoder; 7. Pressure shaft assembly; 71. Sleeve; 72. Pressure block; 73. Spring; 8. T-shaped sleeve; 81. First steel strand; 82. Second steel strand; 83. First slider; 84. Second slider; 85. First wireless distance sensor; 86. Second wireless distance sensor; 9. Wireless compensation distance sensor. Detailed Implementation

[0018] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0020] like Figure 1 As shown, a wireless mine pressure monitoring system includes a ground control subsystem and an underground data acquisition and early warning subsystem. The underground data acquisition and early warning subsystem includes several data acquisition units, a wireless data acquisition unit for the mining roadway, and a wireless data acquisition unit for the goaf. The wireless data acquisition unit for the mining roadway and the wireless data acquisition unit for the goaf communicate with their respective data acquisition units to realize mine pressure monitoring in the mining roadway and the goaf.

[0021] In this embodiment, the wireless data acquisition unit for the mining roadway includes a longitudinal wireless detection component, a point wireless detection component, a wireless borehole stress sensor, and a wireless anchor cable sensor. Each sensor and the wireless acquisition unit uses a star connection for wireless data transmission, and a single wireless acquisition unit can connect to no fewer than 256 wireless sensors. Multiple wireless acquisition units communicate via a chain-like communication mode to achieve wireless communication of sensor data; single-chain or multi-chain connections are possible between wireless acquisition units. The acquisition unit can achieve single-hop connections for 2 to 1024 levels of devices. The wireless sensors, wireless acquisition units, and other equipment are battery-powered, with a service life of no less than 3 years. The acquisition substation is powered via a wired connection, and wireless communication supports low-power communication protocols such as LoRa, NB-IoT, SparkLink, and Bluetooth. Each sensor has an IP65 or higher protection rating, meeting coal mine safety design standards. The acquisition substation connects to the industrial ring network via fiber optic or wired Ethernet, and finally uploads relevant underground signals and data to the surface control subsystem.

[0022] The longitudinal wireless detection component and the point wireless detection component are used to detect the deformation of the top slab, and the point wireless detection component uses a wireless delamination sensor. For example... Figure 2 As shown, the longitudinal wireless detection component includes two mounting components 1 (mounting columns) arranged longitudinally. Each mounting component 1 is equipped with a fixed shaft 2 and a rotating shaft 3 arranged in parallel. The rotating shaft 3 is connected to a wireless encoder 6. Both the fixed shaft 2 and the rotating shaft 3 have fixed through holes 4. Several parallel-arranged sensing ropes 5 have one end fixed to the fixed through hole 4 of the fixed shaft 2 of one mounting component 1, and the other end fixed to the fixed through hole 4 of the rotating shaft 3 of the other mounting component 1. The sensing ropes 5 are in contact with the roof slab. The wireless encoder 6 communicates with the corresponding data acquisition unit. This enables overall detection of large-span roof slabs, improving the safety margin of monitoring. If the roof slab rises, falls, or deforms within the monitoring range, the pressure on the sensing ropes 5 (steel wire ropes) causes the rotating shaft 3 to rotate. The wireless encoder 6 records the length change of the sensing ropes 5 at the roof slab. To prevent the rotating shaft 3 from spinning freely or rotating under inertia, a pressure shaft component 7 is installed on the mounting component 1. Figure 3 As shown, the pressure shaft assembly 7 includes a sleeve 71 and a pressure block 72. One end of the pressure block 72 is slidably disposed inside the sleeve 71, and the other end of the pressure block 72 is provided with a pressure shaft part. The pressure shaft part is provided with a rubber anti-slip layer. A spring 73 is sleeved on the pressure block 72. One end of the spring 73 contacts the pressure shaft part, and the other end of the spring 73 contacts the top of the sleeve 71, so that the pressure shaft part is disposed opposite to the circumferential side of the rotating shaft 3.

[0023] The formula for calculating the total longitudinal top plate deformation rate is as follows: ; in, This represents the total longitudinal top plate deformation rate. To be in the time interval The maximum deformation of the inner top plate cannot be precisely calculated due to the variable location of the deformation. When the line connecting the fixed shaft 2 and the rotating shaft 3 on adjacent mounting components 1 forms an isosceles triangle with respect to the length of the sensing rope 5, the height of the isosceles triangle represents the maximum deformation of the top plate. Figure 4 As shown, The calculation formula is as follows: ; in, The distance between the fixed shaft 2 and the rotating shaft 3 on adjacent mounting components 1. The change in length of the sensing rope 5 is collected by the wireless encoder 6.

[0024] The point wireless detection component includes an installation component 1, on which a wireless delamination sensor and a wireless compensation distance sensor 9 are installed. The wireless delamination sensor includes a T-shaped sleeve 8, inside which a first steel strand 81 and a second steel strand 82 are installed. One end of the first steel strand 81 and the second steel strand 82 are respectively fixed in the rock strata at different heights within the top plate. The other ends of the first steel strand 81 and the second steel strand 82 are respectively installed in the horizontal tube of the T-shaped sleeve 8 using a first slider 83 and a second slider 84. At both ends of the horizontal tube are a first wireless distance sensor 85 and a second wireless distance sensor 86, which are respectively positioned opposite to the first slider 83 and the second slider 84, for collecting the delamination amount of the top plate at relative depth base points and shallow base points.

[0025] The wireless compensation distance sensor 9 is mounted on the mounting assembly 1 via an extension plate and is positioned opposite to the vertical tube of the T-shaped sleeve 8, such as... Figure 5 As shown, the overall descent of the depth base point and shallow base point along with the T-shaped sleeve 8 makes the delamination detection inaccurate. Delamination compensation is performed by collecting distance data through the wireless compensation distance sensor 9 to improve monitoring accuracy.

[0026] The first wireless distance sensor 85, the second wireless distance sensor 86, and the wireless compensation distance sensor 9 all communicate with the same data acquisition unit. The formula for calculating the deformation rate of the surrounding rock at the point based on the data from the first wireless distance sensor 85, the second wireless distance sensor 86, and the wireless compensation distance sensor 9 is as follows: ; in, Let the deformation rate of the surrounding rock be the point. and Divided into time intervals The first and second distance changes within the range, To compensate for changes in distance.

[0027] The delamination safety factor is calculated using the point surrounding rock deformation rate and the total longitudinal roof deformation rate, and the calculation formula is as follows: ; in, For the delamination safety factor, This is the safety ratio coefficient for delamination. and These are the weighting coefficients for longitudinal deformation and point deformation, respectively. It is the unit deformation rate.

[0028] Wireless borehole stress sensors are used to detect changes in surrounding rock stress. The stress disturbance coefficient is calculated based on the data from the wireless borehole stress sensor, using the following formula: ; in, The stress disturbance coefficient is... Real-time stress collected by a wireless borehole stress sensor. Given the initial stress, the stress perturbation coefficient is normalized to obtain the processed stress perturbation coefficient. , .

[0029] Wireless anchor cable sensors are used to detect changes in anchor cable stress. The support safety factor is calculated based on data from both wireless borehole stress sensors and wireless anchor cable sensors, using the following formula: ; in, To ensure the safety factor of the support, This refers to the number of anchor cables per unit length. For the anchor bolt installation angle, The elastic modulus of the anchor cable. The cross-sectional area of ​​the anchor cable is... For the strain force of the anchor cable, For unit length, The width of the alleyway.

[0030] The formula for calculating the safety factor of a mining roadway is as follows: ; in, The safety factor of the mining roadway is defined as follows: the threshold for the safety factor of the mining roadway is 1.1. When the safety factor of the mining roadway is lower than the threshold, reinforcement and support measures are implemented.

[0031] In this embodiment, the wireless data acquisition unit for gob-side retaining includes a longitudinal wireless detection component, a point wireless detection component, a wireless pressure sensor, a wireless distance sensor, a wireless borehole stress sensor, a wireless anchor cable sensor, and a wireless tilt sensor. The wireless pressure sensor is used to detect the pressure values ​​of the top and side supports. The wireless distance sensor is used to detect the distance between the two sides of the gob-side retaining. The wireless tilt sensor is used to detect the tilt angle of the support structure.

[0032] The formula for calculating the safety factor of roadway retention along the goaf is as follows: ; in, To ensure the safety factor of the roadway along the goaf, The safety factor for roadway support along the goaf is calculated using the following formula: ; in, A pressure correction factor that is positively correlated with the pressure values ​​of the top and side supports; the pressure correction factor is greater than 1. This is a gap correction coefficient related to the rate of change of the gap between the two sides; This is the coefficient of the rate of change of the tilt angle of the support after normalization.

[0033] The threshold for the safety factor of the roadway along the goaf is 1. When it is lower than the threshold, reinforcement and support measures are taken.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A wireless mine pressure monitoring system, comprising a ground control subsystem and an underground data acquisition and early warning subsystem, characterized in that: The underground data acquisition and early warning subsystem includes several wireless data acquisition units, a wireless data acquisition unit for the mining roadway, and a wireless data acquisition unit for the goaf retention roadway; the wireless data acquisition unit for the mining roadway and the wireless data acquisition unit for the goaf retention roadway communicate with their respective wireless data acquisition units. Both the wireless data acquisition unit for the mining roadway and the wireless data acquisition unit for the goaf retention roadway are equipped with a wireless roof detection mechanism. The wireless roof detection mechanism includes a longitudinal wireless detection component and a point wireless detection component. Both the longitudinal wireless detection component and the point wireless detection component communicate with the corresponding wireless data acquisition unit. Several wireless data acquisition units communicate with the ground control subsystem through the acquisition substation.

2. The wireless mine pressure monitoring system according to claim 1, characterized in that: The wireless data acquisition unit for the mining roadway includes a longitudinal wireless detection component, a point wireless detection component, a wireless borehole stress sensor, and a wireless anchor cable sensor. The longitudinal wireless detection component and the point wireless detection component are used to detect the deformation of the top plate, and the point wireless detection component adopts a wireless delamination sensor. Wireless borehole stress sensors are used to detect changes in surrounding rock stress. Wireless anchor cable sensors are used to detect changes in anchor cable stress. The longitudinal wireless detection component, wireless delamination sensor, wireless borehole stress sensor, and wireless anchor cable sensor communicate wirelessly with their corresponding wireless data acquisition units via a star connection. Multiple wireless data acquisition units communicate wirelessly via a chain communication mode.

3. The wireless mine pressure monitoring system according to claim 2, characterized in that: The wireless data acquisition unit for roadway entry includes a longitudinal wireless detection component, a point wireless detection component, a wireless pressure sensor, a wireless distance sensor, a wireless borehole stress sensor, a wireless anchor cable sensor, and a wireless tilt sensor. Wireless pressure sensors are used to detect pressure values ​​in the top and side supports; Wireless distance sensors are used to detect the distance between the two sides of the goaf. Wireless tilt sensors are used to detect the tilt angle of the support structure; The longitudinal wireless detection component, wireless delamination sensor, wireless borehole stress sensor, wireless tilt sensor, wireless pressure sensor, wireless distance sensor, and wireless anchor cable sensor communicate wirelessly with their corresponding wireless data acquisition units via a star connection. Multiple wireless data acquisition units communicate wirelessly via a chain communication mode.

4. The wireless mine pressure monitoring system according to claim 3, characterized in that: The longitudinal wireless detection assembly includes two mounting components arranged longitudinally. Each mounting component has a fixed shaft and a rotating shaft arranged in parallel. The rotating shaft is connected to a wireless encoder. Both the fixed shaft and the rotating shaft have fixed through holes. One end of several parallel sensing ropes is fixed to the fixed through hole of the fixed shaft of one of the mounting components, and the other end of several parallel sensing ropes is fixed to the fixed through hole of the rotating shaft of the other mounting component. The sensing ropes are in contact with the top plate. The wireless encoder communicates with the corresponding data acquisition unit. The formula for calculating the total longitudinal top plate deformation rate is as follows: ； in, This represents the total longitudinal top plate deformation rate. To be in the time interval Maximum deformation of the inner top plate. The calculation formula is as follows: ； in, The spacing between the fixed and rotating axes on adjacent mounting components. The change in the length of the sensing rope collected by the wireless encoder.

5. A wireless mine pressure monitoring system according to claim 4, characterized in that: The point wireless detection component includes an installation component, on which a wireless delamination sensor and a wireless compensation distance sensor are installed. The wireless delamination sensor includes a T-shaped sleeve, inside which a first steel strand and a second steel strand are installed. One end of the first steel strand and the second steel strand are respectively fixed in rock strata at different heights within the top plate. The other ends of the first steel strand and the second steel strand are respectively installed in the horizontal tube of the T-shaped sleeve as a first slider and a second slider. At both ends of the horizontal tube are a first wireless distance sensor and a second wireless distance sensor, which are respectively positioned opposite to the first slider and the second slider. The wireless compensation distance sensor is mounted on the mounting assembly via an extension plate and is positioned opposite to the vertical tube of the T-shaped sleeve; The first wireless distance sensor, the second wireless distance sensor, and the wireless compensation distance sensor all communicate with the same data acquisition unit. The formula for calculating the deformation rate of the surrounding rock at the point based on the data from the first wireless distance sensor, the second wireless distance sensor, and the wireless compensation distance sensor is as follows: ； in, Let the deformation rate of the surrounding rock be the point. and Divided into time intervals The first and second distance changes within the range, To compensate for changes in distance.

6. The wireless mine pressure monitoring system according to claim 5, characterized in that: The delamination safety factor is calculated using the point surrounding rock deformation rate and the total longitudinal roof deformation rate, and the calculation formula is as follows: ； in, For the delamination safety factor, This is the safety ratio coefficient for delamination. and These are the weighting coefficients for longitudinal deformation and point deformation, respectively. It is the unit deformation rate.

7. A wireless mine pressure monitoring system according to claim 6, characterized in that: The stress disturbance coefficient is calculated based on data from the wireless borehole stress sensor, using the following formula: ； in, The stress disturbance coefficient is... Real-time stress collected by a wireless borehole stress sensor. Given the initial stress, the stress perturbation coefficient is normalized to obtain the processed stress perturbation coefficient. , .

8. A wireless mine pressure monitoring system according to claim 7, characterized in that: The support safety factor is calculated based on data from wireless borehole stress sensors and wireless anchor cable sensors, using the following formula: ； in, To ensure the safety factor of the support, This refers to the number of anchor cables per unit length. For the anchor bolt installation angle, The elastic modulus of the anchor cable. The cross-sectional area of ​​the anchor cable is... For the strain force of the anchor cable, For unit length, The width of the alleyway.

9. A wireless mine pressure monitoring system according to claim 8, characterized in that: The formula for calculating the safety factor of a mining roadway is as follows: ； in, This is the safety factor for the mining roadway.

10. A wireless mine pressure monitoring system according to claim 9, characterized in that: The formula for calculating the safety factor of roadway retention along the goaf is as follows: ； in, To ensure the safety factor of the roadway along the goaf, The safety factor for roadway support along the goaf is calculated using the following formula: ； in, A pressure correction factor that is positively correlated with the pressure values ​​of the top and side supports; the pressure correction factor is greater than 1. This is a gap correction coefficient related to the rate of change of the gap between the two sides; This is the coefficient of the rate of change of the tilt angle of the support after normalization.

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