A stress and gas combined disaster zoning and grading collaborative management method based on a risk matrix method

Abstract

The application relates to the technical field of environmental treatment, and discloses a stress and gas composite disaster zoning and grading collaborative treatment method based on a risk matrix method. The stress and gas composite disaster zoning and grading collaborative treatment method based on the risk matrix method can realize real-time monitoring of stress evolution of a working face in a mining process by a stress monitoring system, automatically generate stress contour lines, and effectively divide low stress areas, medium stress areas and high stress areas. A gas geological visualization system can visualize gas occurrence conditions of the working face area, effectively improve the evaluation accuracy of the gas occurrence of the working face, accurately divide low gas areas, medium gas areas and high gas areas, and investigate effective drainage radii of different gas occurrence areas in combination with field conditions. On the basis of comprehensive analysis of the gas geological visualization system and the stress monitoring system, the risk matrix method is used for risk identification, risk judgment and risk evaluation of the working face area, low risk areas, medium risk areas, high risk areas and major risk areas are effectively divided, and different treatment measures are taken for different risk areas.

Description

Technical Field

[0001] This invention relates to the field of environmental governance technology, specifically to a method for coordinated governance of stress and gas composite disasters based on risk matrix method, with different regions and levels. Background Technology

[0002] Gas extraction from high-gas, low-permeability coal seams has always been a key technology for regional gas control and the co-mining of coal and gas in my country. As coal mines in my country move into deeper mining, ground stress, gas pressure, and gas content gradually increase. For high-gas, low-permeability coal seams, the difficulty of gas extraction under stress disturbance is increasing, and the risk of outbursts is constantly increasing.

[0003] Currently, the impact of underground mining activities in coal mines causes a redistribution of stress in the working face area. However, the level of monitoring and assessment of stress evolution in mines is low, making it difficult to effectively classify stress evolution during the mining process. This hinders targeted stress transfer or release in "high-stress areas," leading to outburst accidents characterized by "low gas, high stress." Furthermore, the drainage boreholes currently being constructed underground are insufficient to effectively increase the gas desorption area and gas seepage discharge channels, resulting in low pressure relief and a limited impact range and unsatisfactory drainage effects. Moreover, coal seam gas occurrence is characterized by regional and uneven distribution. Existing mine technologies have low accuracy in assessing coal seam gas occurrence, making it difficult to effectively classify gas occurrence areas. This results in an insufficient number of drainage boreholes in "high-gas areas" and an excessive number in "low-gas areas," leading to unreasonable borehole design, increased drilling workload, unsatisfactory coordinated drainage effects, long outburst suppression cycles, and seriously affecting mine mining succession. To address the aforementioned technical challenges, effectively classifying, grading, and differentiating the severity of hazards at the working face has become a key technical bottleneck for effectively releasing or transferring coal stress, improving coal seam permeability and gas extraction rate, finely controlling extraction boreholes, and ensuring the effectiveness of coordinated extraction. In view of this, we propose a risk matrix-based method for the coordinated management of stress and gas composite disasters by region and grade. Summary of the Invention

[0004] The purpose of this invention is to provide a risk matrix method for the zoned and graded collaborative management of stress and gas composite disasters, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hierarchical and coordinated management method for stress-gas composite disasters based on the risk matrix method, wherein the hierarchical and coordinated management method includes the following steps:

[0006] S1. Collect and analyze data from the work site on-site, combine the coal and rock occurrence conditions of the working face, rationally design stress monitoring points for the working face, and pre-embed a certain number of stress monitoring devices in the working face according to the design, monitor the stress evolution of the working face in real time during the underground mining process, and automatically generate stress contour lines through the stress monitoring system to predict the stress evolution law of the working face area, and conduct on-site simulation tests.

[0007] S2. Combine the mine mining engineering plan, input the measured gas content points, gas pressure points, outburst points, faults and other gas geological information during the mine production process into the gas geological visualization system, and use the system to generate content parameters to predict the occurrence pattern of gas content in the working face area.

[0008] S3, through comprehensive analysis of high-gas areas, medium-gas areas, and low-gas areas identified by the gas geology visualization system and high-stress areas, medium-stress areas, and low-stress areas identified by the stress monitoring system;

[0009] S4. Implement differentiated gas management for areas with different risk levels as defined by the risk matrix method;

[0010] S5. Grouting and sealing of the drilled extraction boreholes, and joint pre-extraction of different risk level areas of the working face to coordinate disaster management. Data processing of the combined parameters of the extracted areas at different risk levels; gas anomalies are identified by underground measured coal seam gas content and gas content W > 6m³. 3 / t or gas pressure P > 0.6MPa is a danger zone:

[0011] S6. The identification of indicators for deficiencies in preventive measures and indicators for potential management risks includes:

[0012] Based on the established visualization system and stress monitoring system, the control range, final hole spacing, and lead distance indicators are determined.

[0013] Based on the habitual errors of personnel in all aspects of decision-making regarding reasonable mining deployment in disaster-stricken areas, comprehensive prevention and control measures, and local comprehensive prevention and control measures, establish a database and early warning indicators;

[0014] S7. Recording and defining the final data flow.

[0015] Optionally, S1 further includes: reasonably defining low stress value ≤ σ1, σ1 < medium stress value ≤ σ2, and high stress value > σ2, and dividing the low stress region, medium stress region and high stress region.

[0016] Optionally, S2 further includes: collecting parameter information, which includes a mine excavation engineering plan, mining conditions, coal seam parameters, gas parameters, outburst points, faults and other gas geology, and inputting the information into a gas geology visualization system after summarizing and organizing it.

[0017] Optionally, S2 further includes: reasonably defining low gas value ≤ W1, W1 < medium gas value ≤ W2, and high gas value > W2 based on the on-site gas disaster situation, effectively dividing the low gas area, medium gas area and high gas area.

[0018] Optionally, S3 further includes: using the risk matrix method to identify, determine and assess risks in the working area, and effectively dividing it into low-risk areas, medium-risk areas, high-risk areas and major-risk areas.

[0019] Optionally, S4 further includes: based on the "Basic Indicators for Coal Mine Gas Drainage" GB 41022-2021, combined with the daily coal production of the working face, relevant parameters of the coal and rock mass, the upper limit of gas content W1 in low-gas areas, the upper limit of gas content W2 in medium-gas areas, and the upper limit of gas content in high-gas areas, taking the original gas content, and conducting on-site investigation of the effective drainage radius of the boreholes in the working face area to obtain the effective drainage radius of the boreholes in low-gas areas as R1, in medium-gas areas as R2, and in high-gas areas as R3.

[0020] Optionally, S4 further includes: designing drainage boreholes for low-gas areas in low-risk zones with reference to the effective drainage radius R1, and for medium-gas areas with reference to the effective drainage radius R2; designing drainage boreholes for medium-gas areas in medium-risk zones with reference to the effective drainage radius R2, and for high-gas areas with reference to the effective drainage radius R3, and formulating on-site management measures and risk identification; designing drainage boreholes for medium-gas areas in high-risk zones with reference to the effective drainage radius R2, and for high-gas areas with reference to the effective drainage radius R3, and, in conjunction with the coal and rock mass conditions in medium-stress and high-stress areas, rationally selecting the cavity-forming location and cavity-forming water pressure, and adopting cavity-forming pressure relief and permeability enhancement measures; designing drainage boreholes for high-gas areas in major-risk zones with reference to the effective drainage radius R3, and, in conjunction with the coal and rock mass conditions in high-stress areas, rationally selecting the cavity-forming location and cavity-forming water pressure, and adopting cavity-forming pressure relief and permeability enhancement measures.

[0021] Optionally, S4 further includes: processing the stress distribution and coal seam moisture content formed after hydraulic cavity drilling, and processing the situation after hydraulic cavity drilling construction.

[0022] Optionally, the grouting for sealing is carried out using a two-plug-one-grouting method.

[0023] Optionally, the content parameters include: gas emission rate, gas content, gas pressure contour lines, protected area, and coal pillar influence area.

[0024] Compared with existing technologies, this invention provides a zoned and graded collaborative management method for stress-gas composite disasters based on the risk matrix method, which has the following beneficial effects:

[0025] 1. This risk matrix-based method for the coordinated management of stress and gas composite disasters by region and level utilizes a stress monitoring system to monitor the stress evolution of the working face in real time during underground mining, automatically generating stress contour lines and effectively dividing the area into high-stress, medium-stress, and low-stress zones. A gas geology visualization system visualizes the gas occurrence in the working face area, effectively improving the accuracy of gas occurrence assessment and accurately dividing the area into high-gas, medium-gas, and low-gas zones. Based on the comprehensive analysis of the gas geology visualization system and the stress monitoring system, the risk matrix method is used to identify, determine, and assess risks in the working face area, effectively dividing it into low-risk, medium-risk, high-risk, and major-risk zones.

[0026] 2. This risk matrix-based method for the differentiated and graded management of stress and gas composite disasters implements differentiated gas management for areas with different risk levels within the working face. For low-risk areas with low gas levels, drainage boreholes are designed with reference to the effective drainage radius R1; for medium-risk areas with medium gas levels, drainage boreholes are designed with reference to the effective drainage radius R2; for high-risk areas with high gas levels, drainage boreholes are designed with reference to the effective drainage radius R3, and on-site management measures and risk identification are formulated. For high-risk areas with medium gas levels, drainage boreholes are designed with reference to the effective drainage radius R2; for high-risk areas with high gas levels, drainage boreholes are designed with reference to the effective drainage radius R3. The design of drainage boreholes should be carried out in accordance with the coal and rock mass conditions in medium-stress and high-stress areas. The location and water pressure for creating drainage holes should be selected reasonably, and measures such as creating drainage holes to relieve pressure and increase permeability should be taken to release or transfer stress, increase the exposed area and permeability of the coal body, and improve drainage efficiency. In high-gas areas of major risk areas, drainage boreholes should be designed with reference to the effective drainage radius R3 of the borehole. The location and water pressure for creating drainage holes should be selected reasonably, and measures such as creating drainage holes to relieve pressure and increase permeability should be taken to release or transfer stress, increase the exposed area and permeability of the coal body, and improve drainage efficiency.

[0027] 3. This risk matrix-based method for the coordinated management of stress and gas composite disasters by zoning and grading effectively releases or transfers stress by implementing cavity-making and permeability-enhancing measures in high-risk and major-risk areas. This directly increases the exposed area of ​​the coal body, expands the internal fracture network of the coal body, and forms an effective channel for gas diffusion and migration, significantly improving the permeability of the coal body. At the same time, the large flow of water during the cavity-making process increases the water content of the plastic zone around the cavity, further softening the coal body and promoting gas desorption and migration. Targeted measures are taken to reduce the possibility of composite dynamic disasters, while improving the extraction efficiency of coal seams in high-risk and major-risk areas, ensuring the effectiveness of zoned and graded coordinated extraction at the working face, and greatly shortening the outburst suppression cycle. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the strain monitoring device arrangement of the present invention;

[0029] Figure 2 This is a schematic diagram of the risk matrix of the present invention;

[0030] Figure 3 This is a schematic diagram of the risk area division of the working face according to the present invention;

[0031] Figure 4 This is a schematic diagram of the hydraulic cavity creation, pressure relief, and permeability enhancement of the present invention.

[0032] In the diagram: 1. Transport roadway; 2. Return airway; 3. Cut-off point; 4. Stress monitoring device; 5. Working face; 6. Low-gas area; 7. Medium-gas area; 8. High-gas area; 9. Low-stress area; 10. Medium-stress area; 11. High-stress area; 12. Low-risk area; 13. Medium-risk area; 14. High-risk area; 15. Major-risk area; 16. Hydraulic cavity drilling; 17. Cavity; 18. Fractured zone; 19. Average original rock stress curve; 20. Stress variation curve; 21. Original water content curve of coal seam; 22. Water content variation curve of coal seam; 23. Coal and rock mass. Detailed Implementation

[0033] like Figures 1-4 As shown, this invention provides a technical solution: a method for coordinated management of stress-gas composite disasters based on risk matrix method, comprising the following steps:

[0034] S1. Collect and analyze data from the work site. Based on the occurrence of coal and rock mass 23 in working face 5, and to meet the stress monitoring needs of working face 5, design stress monitoring points for working face 5. Pre-embed stress monitoring devices 4 in working face 5 through transport roadway 1, return airway 2, and cut-out 3. Collect data from stress monitoring devices 4 and summarize them into the stress monitoring system. Automatically generate stress contour lines to predict the stress evolution law in the working face 5 area. At the same time, based on relevant documents and on-site stress disaster conditions, reasonably define low stress value ≤ σ1, σ1 < medium stress value ≤ σ2, and high stress value > σ2, effectively dividing high stress area 9, medium stress area 10, and low stress area 11.

[0035] S2. Collect mine mining engineering plan, mining conditions, coal seam parameters, gas parameters, outburst points, faults and other gas geological information, summarize and organize it and enter it into the gas geological visualization system. Automatically generate gas emission, gas content, gas pressure contour lines, protected area, coal pillar influence area, etc., predict the gas content occurrence pattern in working face 5 area, and at the same time, according to the "Detailed Rules for the Prevention and Control of Coal and Gas Outbursts", other relevant documents and on-site gas disaster conditions, reasonably define low gas value ≤ W1, W1 < medium gas value ≤ W2, high gas value > W2, effectively divide low gas area 6, medium gas area 7 and high gas area 8.

[0036] S3. Using the risk matrix method, the low-gas region 6, medium-gas region 7, and high-gas region 8 are equivalent to the horizontal axis interval of the coordinate system, and the low-stress region 9, medium-stress region 10, and high-stress region 11 are equivalent to the vertical axis interval of the coordinate system. Further, the risk matrix method is used to identify, determine, and assess the risks of the working face 5 region, and the low-risk region 12, medium-risk region 13, high-risk region 14, and major-risk region 15 are equivalently divided.

[0037] S4. Using the risk matrix method, low-risk area 12, medium-risk area 13, high-risk area 14, and major-risk area 15 are equivalently divided in the coordinate system. The stress and gas values ​​for different risk areas are determined. Combining the gas content occurrence and stress evolution patterns in working face 5, low-risk area 12, medium-risk area 13, high-risk area 14, and major-risk area 15 are further divided within working face 5. (Referring to the "Basic Indicators for Coal Mine Gas Drainage" GB...) Based on 41022-2021, and considering the daily coal production of working face 5, relevant parameters of coal and rock mass 23, the upper limit of gas content W1 in low-gas area 6, the upper limit of gas content W2 in medium-gas area 7, and the upper limit of gas content W3 in high-gas area 8 (taking the original gas content), the effective drainage radius of boreholes in working face 5 was investigated on-site. The effective drainage radius of boreholes in low-gas area 6 was determined to be R1, in medium-gas area 7 R2, and in high-gas area 8 R3. For low-risk area 12, the design of drainage boreholes in low-gas area 6 was based on the effective drainage radius R1, and the design of drainage boreholes in medium-gas area 7 was based on the effective drainage radius R2. For medium-risk area 13, the design of drainage boreholes in medium-gas area 7 was based on the effective drainage radius R2. Drainage boreholes were designed with a drainage radius of R2. In high-gas area 8, drainage boreholes were designed with reference to the effective drainage radius of R3, and on-site management measures and risk identification were formulated. In medium-gas area 7 of high-risk area 14, drainage boreholes were designed with reference to the effective drainage radius of R2, and in high-gas area 8, drainage boreholes were designed with reference to the effective drainage radius of R3. In combination with the coal and rock mass 23 of medium-stress area 10 and high-stress area 11, the location and water pressure for creating drainage holes were reasonably selected, and measures for depressurization and permeability enhancement were adopted. In high-gas area 8 of major-risk area 15, drainage boreholes were designed with reference to the effective drainage radius of R3, and in combination with the coal and rock mass 23 of high-stress area 11, the location and water pressure for creating drainage holes were reasonably selected, and measures for depressurization and permeability enhancement were adopted.

[0038] In this embodiment, the stress distribution and coal seam moisture content resulting from the hydraulic cavity-forming process are described using the case of hydraulic cavity-forming borehole 16 as an example. After the hydraulic cavity-forming borehole 16 is constructed, a cavity 17 is generated in the coal and rock mass 23, and a fracture zone 18 is developed around the cavity 17. The stress change curve 20 near the fracture zone 18 is significantly lower than the average original rock stress curve 19. The coal seam moisture content change curve 22 is significantly higher than the original coal seam moisture content curve 21 near the fracture zone 18. The increase in moisture content of the coal and rock mass 23 near the fracture zone 18 further softens the coal body and promotes the desorption and migration of gas.

[0039] S5. Perform "two-plugging-one-grouting" sealing grouting on the extraction boreholes drilled within working face 5. Conduct joint pre-drainage in low-risk area 12, medium-risk area 13, high-risk area 14, and major-risk area 15 within working face 5 to collaboratively manage disasters at working face 5. Simultaneously, process the combined parameters of the extracted areas at different risk levels. Gas anomalies are identified through underground measured coal seam gas content and gas content W > 6m³. 3 / t or gas pressure P > 0.6MPa is a danger zone.

[0040] S6. The identification of indicators for deficiencies in preventive measures and indicators for potential management risks includes:

[0041] Based on the established visualization system and stress monitoring system, the control range, final hole spacing, and lead distance indicators are determined.

[0042] Based on the habitual errors of personnel involved in various stages of disaster-related decision-making regarding reasonable mining deployment, comprehensive prevention and control measures, and local comprehensive prevention and control measures, a database and early warning indicators will be established.

[0043] S7. Recording and defining the final data flow.

[0044] In this embodiment, by implementing cavity-creating pressure relief and permeability enhancement measures in high-risk and major-risk areas, stress can be effectively released or transferred, directly increasing the exposed area of ​​the coal body, expanding the internal fracture network of the coal body, forming an effective channel for gas diffusion and migration, and significantly improving the permeability of the coal body. At the same time, the large flow of water during the cavity-creating process increases the moisture content of the plastic zone around the cavity, further softening the coal body, promoting gas desorption and migration, and taking targeted measures to reduce the possibility of complex dynamic disasters. It also improves the extraction efficiency of coal seams in high-risk and major-risk areas, ensures the effect of zoned and graded coordinated extraction of the working face, and greatly shortens the gas outburst elimination cycle.

[0045] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A method for coordinated management of stress-gas composite disasters based on risk matrix method, characterized in that: The hierarchical collaborative governance method includes the following steps: S1. Collect and analyze the data at the work site on-site. Combine the coal and rock occurrence of the working face (5) to design stress monitoring points for the working face (5). In accordance with the design, a certain number of stress monitoring devices (4) are pre-embedded in the working face (5) to monitor the stress evolution of the working face (5) in real time during the underground mining process. The stress isopleths are automatically generated through the stress monitoring system to predict the stress evolution law in the working face (5) area and conduct on-site simulation tests. S2. Combine the mine mining engineering plan, input the measured gas content points, gas pressure points, outburst points, faults and other gas geological information during the mine production process into the gas geological visualization system, and use the system to generate content parameters to predict the gas content occurrence law in the working face (5) area. S3, through comprehensive analysis of the low gas area (6), medium gas area (7), high gas area (8) identified by the gas geological visualization system and the low stress area (9), medium stress area (10), high stress area (11) identified by the stress monitoring system; S4. Implement differentiated gas management for areas with different risk levels as defined by the risk matrix method; S5. Grouting is performed on the extracted boreholes, and joint pre-extraction is carried out in different risk level areas of the working face (5) to coordinate the management of disasters in the working face (5). The joint parameters of the extracted different risk level areas are processed. Through the underground measured coal seam gas parameters, the gas content W > 6m 3 / t or gas pressure P > 0.6MPa is a danger zone: S6. The identification of indicators for deficiencies in preventive measures and indicators for potential management risks includes: Based on the established visualization system and stress monitoring system, the control range, final hole spacing, and lead distance indicators are determined. Based on the habitual errors of personnel in all aspects of decision-making regarding reasonable mining deployment in disaster-stricken areas, comprehensive prevention and control measures, and local comprehensive prevention and control measures, establish a database and early warning indicators; S7. Recording and defining the final data flow.

2. The method for coordinated management of stress and gas composite disasters based on risk matrix method according to claim 1, characterized in that: S1 further includes: reasonably defining low stress value ≤ σ1, σ1 < medium stress value ≤ σ2, and high stress value > σ2, and dividing the low stress region (9), medium stress region (10) and high stress region (11).

3. The method for coordinated regional and hierarchical management of stress and gas composite disasters based on the risk matrix method according to claim 1, characterized in that: S2 further includes: collecting parameter information, which includes mine mining engineering plan, mining conditions, coal seam parameters, gas parameters, outburst points, faults and other gas geology, and inputting the collected information into the gas geology visualization system.

4. The method for coordinated regional management of stress and gas composite disasters based on the risk matrix method according to claim 1, characterized in that: S2 further includes: based on the on-site gas disaster situation, reasonably define low gas value ≤ W1, W1 < medium gas value ≤ W2, and high gas value > W2, and effectively divide the low gas area (6), medium gas area (7) and high gas area (8).

5. The method for coordinated management of stress and gas composite disasters based on risk matrix method according to claim 1, characterized in that: The S3 further includes: using the risk matrix method to identify, determine and assess risks in the working area (5), and effectively dividing it into low-risk areas (12), medium-risk areas (13), high-risk areas (14) and major-risk areas (15).

6. The method for coordinated management of stress and gas composite disasters based on risk matrix method according to claim 1, characterized in that: S4 further includes: based on the "Basic Indicators for Gas Drainage in Coal Mines" GB 41022-2021, combined with the daily coal production of the working face (5), relevant parameters of the coal and rock mass (23), the upper limit of gas content W1 in the low gas area (6), the upper limit of gas content W2 in the medium gas area (7), and the upper limit of gas content in the high gas area (8), taking the original gas content, and conducting on-site investigation of the effective drainage radius of the borehole in the working face (5) area, the effective drainage radius of the borehole in the low gas area (6) is R1, the effective drainage radius of the borehole in the medium gas area (7) is R2, and the effective drainage radius of the borehole in the high gas area (8) is R3.

7. The method for coordinated management of stress and gas composite disasters based on risk matrix method according to claim 1, characterized in that: S4 further includes: for low-risk areas (12) with low gas areas (6), designing extraction boreholes with reference to the effective extraction radius R1; for medium-gas areas (7), designing extraction boreholes with reference to the effective extraction radius R2; for medium-risk areas (13) with medium gas areas (7), designing extraction boreholes with reference to the effective extraction radius R2; for high-gas areas (8), designing extraction boreholes with reference to the effective extraction radius R3; and formulating on-site management measures and risk identification; for high-risk areas (14) with medium gas areas (7), designing extraction boreholes with reference to the effective extraction radius R3. Drainage boreholes are designed with a drainage radius of R2. In the high-gas area (8), drainage boreholes are designed with reference to the effective drainage radius of R3. In combination with the coal and rock mass (23) conditions in the medium-stress area (10) and high-stress area (11), the location and water pressure for creating cavities are reasonably selected, and measures for creating cavities to relieve pressure and increase permeability are taken. In the high-gas area (8) of the major risk area (15), drainage boreholes are designed with reference to the effective drainage radius of R3. In combination with the coal and rock mass (23) conditions in the high-stress area (11), the location and water pressure for creating cavities are reasonably selected, and measures for creating cavities to relieve pressure and increase permeability are taken.

8. The method for coordinated management of stress and gas composite disasters based on risk matrix method according to claim 6, characterized in that: The S4 further includes: the stress distribution and coal seam moisture content formed after the hydraulic cavity drilling (16), and the treatment of the situation after the hydraulic cavity drilling (16) construction.

9. The method for coordinated regional management of stress and gas composite disasters based on the risk matrix method according to claim 1, characterized in that: The sealing grouting is carried out using a two-plug-one-grouting method.

10. The method for coordinated regional management of stress and gas composite disasters based on the risk matrix method according to claim 1, characterized in that: The content parameters include: gas emission rate, gas content, gas pressure contour lines, protected area, and coal pillar influence area.

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