CN-122014350-A - Method and system for monitoring and disaster prevention and control of coal mine gas leakage

CN122014350ACN 122014350 ACN122014350 ACN 122014350ACN-122014350-A

Abstract

The application discloses a method and a system for monitoring and disaster prevention and control of coal mine gas leakage, and relates to the technical field of gas leakage monitoring. The method comprises the steps of obtaining multi-dimensional monitoring data in each gas monitoring unit of the closed coal mine, wherein the multi-dimensional monitoring data at least comprise gas concentration, air pressure, temperature and rock stratum vibration parameters of different space positions in each gas monitoring unit. According to the application, through fusing multidimensional data such as gas concentration, air pressure, temperature and rock stratum vibration, the limitation of traditional single parameter monitoring is broken through, the accurate representation of gas leakage risk is realized by combining quantitative evaluation of gas diffusion dynamic indexes and structural integrity coefficients, the basis of initial risk evaluation is improved, the risk value is dynamically corrected by introducing leakage correlation effects affecting correction coefficients and adjacent monitoring units and through quantitative analysis of fracture connectivity and space distance, and the problem of evaluation deviation caused by neglecting regional correlation in the traditional method is solved.

Inventors

ZHANG QIAN
SHI DONGHONG
GUO YUQI
GUO HAOTIAN
ZHANG CHI
Gou Enze

Assignees

国信地脉(兰州)科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260323

Claims (11)

1. The method for monitoring and controlling the gas leakage of the closed coal mine and disaster is characterized by comprising the following steps of: the multi-dimensional monitoring data in each gas monitoring unit of the closed coal mine is obtained, and the multi-dimensional monitoring data at least comprises gas concentration, air pressure, temperature and rock stratum vibration parameters of different space positions in each gas monitoring unit; acquiring initial gas leakage risk values of different spatial positions based on the monitoring data of each dimension, wherein the initial gas leakage risk values are at least used for representing the possibility of gas breakthrough of a sealing structure at corresponding positions; Acquiring an influence correction coefficient corresponding to each gas monitoring unit based on the initial risk values of gas leakage of different spatial positions, wherein the influence correction coefficient is at least used for representing the association degree of leakage risk of the corresponding gas monitoring unit by the leakage state of the gas monitoring unit adjacent to the corresponding gas monitoring unit; acquiring corrected leakage risk values of all gas monitoring units based on the influence correction coefficients and the initial gas leakage risk values; and starting the leakage disaster prevention and control measures of corresponding grades and dynamically adjusting the leakage disaster prevention and control measures based on the corrected leakage risk value.
2. The method for monitoring and controlling gas leakage and disaster in a closed coal mine according to claim 1, wherein the step of obtaining multi-dimensional monitoring data in each gas monitoring unit in the closed coal mine comprises the steps of: dividing a closed coal mine into a plurality of first gas monitoring units based on roadway distribution, a sealing area and rock stratum fracture characteristics of the closed coal mine; Acquiring a second gas monitoring unit based on the integrity and the geological stability of historical monitoring data of each first gas monitoring unit, wherein the second gas monitoring unit is any area in which multidimensional data acquisition or data abnormality is not completed in each first gas monitoring unit; Based on the spatial distribution of the second gas monitoring unit, a monitoring network consisting of mobile monitoring equipment and fixed sensor nodes is arranged, and real-time monitoring data of different spatial positions are acquired; and carrying out noise reduction and outlier rejection processing on the acquired real-time monitoring data to acquire multidimensional monitoring data of the second gas monitoring unit.
3. The method for monitoring and controlling gas leakage and disaster prevention in a closed coal mine according to claim 2, wherein the acquiring initial risk values of gas leakage in different spatial positions based on the monitored data in each dimension comprises: Acquiring a gas diffusion power index based on air pressure and temperature parameters of different spatial positions, wherein the gas diffusion power index is at least used for representing the power of gas flowing in a rock stratum fracture; Obtaining a structural integrity coefficient based on rock stratum vibration parameters of different spatial positions, wherein the structural integrity coefficient is at least used for representing the peripheral sealing structure of the position and the leakage resistance of the rock stratum; Acquiring a gas leakage potential value based on the gas diffusion power index and the structural integrity coefficient, wherein the gas leakage potential value is at least used for representing the internal possibility of gas leakage at a single spatial position; and combining the gas concentration data and the gas leakage potential value at the corresponding position to obtain the initial gas leakage risk value, wherein the initial gas leakage risk value, the gas concentration and the gas leakage potential value are in positive correlation.
4. The method for monitoring and controlling gas leakage and disaster prevention in a closed coal mine according to claim 1, wherein the acquiring the gas diffusion power index based on the gas pressure and temperature parameters of different spatial positions comprises: Based on an ideal gas state equation, establishing a three-dimensional correlation model of gas pressure, temperature and gas concentration, substituting the gas pressure and temperature data of different spatial positions into the model, and obtaining a gas theoretical diffusion rate; selecting standard state parameters under the same geological condition of a closed coal mine, standard air pressure P0 and standard temperature T0, and calculating deviation values delta P and delta T of actual monitoring parameters and standard parameters; based on the theoretical diffusion speed of the gas and the deviation values delta P and delta T, obtaining a gas diffusion power index through weighted calculation, wherein the calculation formula is as follows: ; Wherein D is a gas diffusion power index, v is a gas theoretical diffusion rate, α, β, γ are weight coefficients of rate, pressure deviation, temperature deviation, respectively, and α+β+γ=1, Δp is a difference between an actual pressure and a standard pressure, Δt is a difference between an actual temperature and a standard temperature, P0 is a standard pressure, and T0 is a standard temperature.
5. The method for monitoring and controlling coal mine gas leakage and disaster prevention according to claim 4, wherein the obtaining the structural integrity coefficient based on the rock stratum vibration coefficients of different spatial positions comprises: For any spatial position in the same gas monitoring unit, extracting frequency data of a rock stratum vibration accelerometer in a continuous preset time period of the position; Based on vibration data, obtaining a vibration amplitude variation coefficient C v and a main frequency offset delta f, wherein the vibration amplitude variation coefficient C v is the ratio of the standard deviation to the average value of the vibration amplitude, and the main frequency offset delta f is the difference between the actual main frequency and the main frequency when the sealing structure is stable; Setting a reference coefficient of variation C v of structural integrity and a reference dominant frequency offset Deltaf 0, and calculating the structural integrity coefficient by the following formula: ; wherein S is a structural integrity coefficient, the value range is [0,1], delta and epsilon are weight coefficients of the variation coefficient and the main frequency offset, delta+epsilon=1, and when S is less than or equal to 0, the structure is judged to be invalid.
6. The method for monitoring and controlling coal mine gas leakage and disaster prevention according to claim 5, wherein the obtaining the gas leakage potential value based on the gas diffusion power index and the structural integrity coefficient comprises: analyzing the matching relation between the gas diffusion power index D and the structural integrity coefficient S of the same spatial position, and judging that the position has leakage potential when the D is more than or equal to a preset power threshold value and the S is less than or equal to a preset integrity threshold value; Based on the leakage potential judging result, combining the vertical distance L between the position and the sealing layer to obtain a leakage path resistance coefficient R, wherein the larger the distance is, the larger the resistance coefficient is; the gas leakage potential value is calculated by the following formula: ; wherein Q is a gas leakage potential value, R is a leakage path resistance coefficient, and the leakage path resistance coefficient is positively correlated with the vertical distance L.
7. The method for monitoring and controlling gas leakage and disaster prevention in a closed coal mine according to claim 3, wherein the step of combining the gas concentration data and the gas leakage potential value at the corresponding position to obtain the initial risk value of gas leakage comprises the steps of: Based on the gas concentration of different space positions in each gas monitoring unit, acquiring the concentration exceeding degree C, namely the ratio of the actual concentration to the safety concentration threshold; Matching the concentration exceeding degree C of each spatial position with the gas leakage potential value Q according to spatial coordinates to construct a risk assessment matrix; Based on the risk assessment matrix, acquiring a gas leakage initial risk value R0 through normalization processing, wherein the calculation formula is as follows: ; Wherein norm () is a normalization function, parameter normalization values [0,1] are in intervals, λ, u are weight coefficients of concentration exceeding degree and leakage potential value, respectively, and λ+u=1.
8. The method for monitoring and controlling gas leakage and disaster prevention in a closed coal mine according to claim 1, wherein the obtaining the impact correction coefficients corresponding to each gas monitoring unit based on the initial risk values of gas leakage in different spatial positions comprises: Acquiring target monitoring units based on the spatial distribution of the gas monitoring units, wherein the target monitoring units are any units which do not acquire influence correction coefficients in the gas monitoring units; The method comprises the steps of acquiring an associated monitoring unit based on the target monitoring unit, wherein the associated monitoring unit is a gas monitoring unit which is adjacent to the target monitoring unit and communicated with a rock stratum fracture; Acquiring a crack connectivity K and a space distance d between a target monitoring unit and an associated monitoring unit, and simultaneously calculating an initial risk value difference delta R0 between the target monitoring unit and the associated monitoring unit in the same time period; based on the fracture connectivity K, the spatial distance d and the risk value difference value delta R0, the field influence degree I is obtained through the following formula: ; Based on the field influence degree I of all the relevant monitoring units of the target monitoring unit, taking an average value as an influence correction coefficient eta of the target monitoring unit.
9. The method for monitoring and controlling gas leakage and disaster prevention in a closed coal mine according to claim 8, wherein the steps of obtaining corrected leakage risk values of each gas monitoring unit based on the influence correction coefficient and the initial risk value of gas leakage, and starting corresponding-level gas disaster prevention and control measures include: The corrected leakage risk value R is calculated by the following formula: ; wherein R is a corrected leakage risk value, R0 is a gas leakage initial risk value, and eta is an influence correction coefficient; Presetting a three-level risk threshold, wherein a low risk threshold R1, a medium risk threshold R2 and a high risk threshold R3, and R1 is less than R2 and less than R3; When R is less than or equal to R1, starting a first-level prevention and control, enhancing the monitoring frequency of the area, and keeping the ventilation system to normally operate; When R1 is less than or equal to R2, starting secondary prevention and control, and carrying out airtight seal detection on the sealing structure on the basis of primary prevention and control, and supplementing grouting to strengthen a weak area; When R is more than R3, three-level prevention and control are started, the area is immediately blocked, an emergency extraction system is started, surrounding people are evacuated, and a warning area is set.
10. The method for monitoring and controlling gas leakage and disaster in a closed coal mine according to claim 9, further comprising a step of feeding back an effect of controlling measures: After starting the prevention and control measures, continuously monitoring multidimensional data corresponding to the gas monitoring units, and calculating the risk reduction rate after prevention and control ; If the delta R% is more than or equal to the preset effect threshold, maintaining the current prevention and control measures, and if the delta R% is less than the preset effect threshold, adjusting weight distribution affecting the correction coefficient eta, recalculating the correction leakage risk value and optimizing the prevention and control measures.
11. A system for closing a coal mine gas leakage monitoring and disaster prevention and control, comprising: The data acquisition module comprises fixed sensing nodes and mobile monitoring equipment, wherein the fixed sensing stages are arranged at the periphery of a sealing area and at key positions of a roadway and are used for acquiring data of gas concentration, gas pressure and temperature; The risk assessment module is connected with the data acquisition module and used for receiving the multidimensional monitoring data and calculating a gas diffusion power index, a structural integrity coefficient and a gas leakage initial risk value based on a preset algorithm; the correction calculation module is connected with the risk assessment module and used for acquiring initial risk values of all monitoring units, calculating the influence degree of the field and the influence correction coefficient, and further acquiring a corrected leakage risk value; the prevention and control execution module is connected with the correction calculation module and comprises a ventilation control unit, a grouting reinforcement unit, an emergency extraction unit and an acousto-optic early warning unit, and is used for starting prevention and control measures of corresponding grades according to the correction risk value; The visual monitoring module is respectively connected with the data acquisition module, the risk evaluation module and the prevention and control execution module, and is used for displaying the risk state and the prevention and control measure execution condition of each monitoring unit in real time based on closing the coal mine three-dimensional geological model, and triggering the grading early warning popup window and the voice prompt when the risk value exceeds the standard.

Description

Method and system for monitoring and disaster prevention and control of coal mine gas leakage Technical Field The invention relates to the technical field of gas leakage monitoring, in particular to a method and a system for monitoring gas leakage and controlling disaster in a closed coal mine. Background The problems of coal mine closing due to underground supporting structure aging, rock stratum stress redistribution, sealing facility failure and the like are easy to occur, the hidden danger of gas leakage is easy to occur, the leakage path is hidden, concentration fluctuation is large, the traditional monitoring method is mostly dependent on fixed point sampling, the defects of large monitoring blind area and delayed response exist, in the prior art, gas monitoring is mostly used for real-time management and control of a production mine, a dynamic monitoring system aiming at the coal mine closing is not perfect, accurate representation of gas leakage diffusion rules and quantitative evaluation of field influence are not available, disaster prevention and control measures are insufficient, and threat is formed to surrounding environment and personnel safety. Therefore, the application provides a method and a system for monitoring and controlling coal mine gas leakage and disaster prevention. Disclosure of Invention The invention aims to provide a method and a system for monitoring and controlling coal mine gas leakage and disaster prevention and control, which are used for solving the problems in the background technology. In order to achieve the purpose, the invention provides the following technical scheme that the method for monitoring and controlling the leakage of the gas in the coal mine comprises the following steps: the multi-dimensional monitoring data in each gas monitoring unit of the closed coal mine is obtained, and the multi-dimensional monitoring data at least comprises gas concentration, air pressure, temperature and rock stratum vibration parameters of different space positions in each gas monitoring unit; acquiring initial gas leakage risk values of different spatial positions based on the monitoring data of each dimension, wherein the initial gas leakage risk values are at least used for representing the possibility of gas breakthrough of a sealing structure at corresponding positions; Acquiring an influence correction coefficient corresponding to each gas monitoring unit based on the initial risk values of gas leakage of different spatial positions, wherein the influence correction coefficient is at least used for representing the association degree of leakage risk of the corresponding gas monitoring unit by the leakage state of the gas monitoring unit adjacent to the corresponding gas monitoring unit; acquiring corrected leakage risk values of all gas monitoring units based on the influence correction coefficients and the initial gas leakage risk values; and starting the leakage disaster prevention and control measures of corresponding grades and dynamically adjusting the leakage disaster prevention and control measures based on the corrected leakage risk value. As a specific solution of the present application, the acquiring the multidimensional monitoring data in each gas monitoring unit of the closed coal mine includes: dividing a closed coal mine into a plurality of first gas monitoring units based on roadway distribution, a sealing area and rock stratum fracture characteristics of the closed coal mine; Acquiring a second gas monitoring unit based on the integrity and the geological stability of historical monitoring data of each first gas monitoring unit, wherein the second gas monitoring unit is any area in which multidimensional data acquisition or data abnormality is not completed in each first gas monitoring unit; Based on the spatial distribution of the second gas monitoring unit, a monitoring network consisting of mobile monitoring equipment and fixed sensor nodes is arranged, and real-time monitoring data of different spatial positions are acquired; and carrying out noise reduction and outlier rejection processing on the acquired real-time monitoring data to acquire multidimensional monitoring data of the second gas monitoring unit. As a specific scheme of the technical scheme of the application, the method for acquiring the initial risk value of gas leakage at different spatial positions based on the dimension monitoring data comprises the following steps: Acquiring a gas diffusion power index based on air pressure and temperature parameters of different spatial positions, wherein the gas diffusion power index is at least used for representing the power of gas flowing in a rock stratum fracture; Obtaining a structural integrity coefficient based on rock stratum vibration parameters of different spatial positions, wherein the structural integrity coefficient is at least used for representing the peripheral sealing structure of the position and the leakage resistance of the