Pressure relief law and application of deep-buried high-stress bedding coal by hydraulic flushing
In order to solve the problem of the high risk of coal and gas outburst in deep coal working face, taking 12090 working face of Shoushan No.1 Coal Mine as the engineering background, the paper analyzes the deformation and stress variation law of coal body after hydraulic flushing in coal working fac...
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| Format: | Article |
| Language: | zho |
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Editorial Department of Industry and Mine Automation
2022-10-01
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| Series: | Gong-kuang zidonghua |
| Subjects: | |
| Online Access: | http://www.gkzdh.cn/article/doi/10.13272/j.issn.1671-251x.17966 |
| _version_ | 1797868986038222848 |
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| author | ZHANG Jianguo ZHAI Cheng |
| author_facet | ZHANG Jianguo ZHAI Cheng |
| author_sort | ZHANG Jianguo |
| collection | DOAJ |
| description | In order to solve the problem of the high risk of coal and gas outburst in deep coal working face, taking 12090 working face of Shoushan No.1 Coal Mine as the engineering background, the paper analyzes the deformation and stress variation law of coal body after hydraulic flushing in coal working face under deep-buried and high-stress environment by numerical simulation method. The conclusions are listed as follows. The coal body around the hydraulic flushing hole deforms towards the hole, which is conducive to the development and conduction of cracks in the coal body, thus improving the permeability of the coal body. The horizontal stress of the coal body in the flushing area is effectively reduced. The pressure relief areas formed by each punching hole are interconnected to form a pressure relief strip, which is conducive to gas migration and extraction. According to the numerical simulation results and the actual project, the hydraulic flushing project scheme of 12090 working face in Shoushan No. 1 Coal Mine is determined. The upper side drilling angle is 5-6°, and the lower side drilling angle is −5-−4°. The drilling spacing is 4 m, and the length of each punching hole is 1 m. The spacing of flushing holes in each borehole is 7 m, and no flushing operation is carried out within 30 m from the roadway side. The flushing water pressure is 5-6 MPa, and the flow rate is 120-160 L/min. The practice shows that after adopting this scheme, the number of holes completed per month reaches 40 and the completion rate reaches 80%. The gas extraction concentration in the flushing hole is high and the gas attenuation is slow. After 50 days of extraction, the gas volume fraction in the flushing hole is 40%-60%, which is 2-3 times of that in the ordinary hole. After 120 days of extraction, the gas volume fraction in the flushing hole is still 20%. Hydraulic flushing effectively improves the gas extraction effect and reduces the gas content in coal seams. The average gas volume fraction of return air flow decreases to below 0.5%. The average daily footage of the working face increases from 2.4 m to 3.2 m, which improves productivity. |
| first_indexed | 2024-04-10T00:05:33Z |
| format | Article |
| id | doaj.art-5effcd71ea08491190c159b0fee8b20a |
| institution | Directory Open Access Journal |
| issn | 1671-251X |
| language | zho |
| last_indexed | 2024-04-10T00:05:33Z |
| publishDate | 2022-10-01 |
| publisher | Editorial Department of Industry and Mine Automation |
| record_format | Article |
| series | Gong-kuang zidonghua |
| spelling | doaj.art-5effcd71ea08491190c159b0fee8b20a2023-03-17T01:01:13ZzhoEditorial Department of Industry and Mine AutomationGong-kuang zidonghua1671-251X2022-10-014810116122, 14110.13272/j.issn.1671-251x.17966Pressure relief law and application of deep-buried high-stress bedding coal by hydraulic flushingZHANG Jianguo0ZHAI Cheng1China Pingmei Shenma Energy and Chemical Group Co., Ltd., Pingdingshan 467000, ChinaSchool of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaIn order to solve the problem of the high risk of coal and gas outburst in deep coal working face, taking 12090 working face of Shoushan No.1 Coal Mine as the engineering background, the paper analyzes the deformation and stress variation law of coal body after hydraulic flushing in coal working face under deep-buried and high-stress environment by numerical simulation method. The conclusions are listed as follows. The coal body around the hydraulic flushing hole deforms towards the hole, which is conducive to the development and conduction of cracks in the coal body, thus improving the permeability of the coal body. The horizontal stress of the coal body in the flushing area is effectively reduced. The pressure relief areas formed by each punching hole are interconnected to form a pressure relief strip, which is conducive to gas migration and extraction. According to the numerical simulation results and the actual project, the hydraulic flushing project scheme of 12090 working face in Shoushan No. 1 Coal Mine is determined. The upper side drilling angle is 5-6°, and the lower side drilling angle is −5-−4°. The drilling spacing is 4 m, and the length of each punching hole is 1 m. The spacing of flushing holes in each borehole is 7 m, and no flushing operation is carried out within 30 m from the roadway side. The flushing water pressure is 5-6 MPa, and the flow rate is 120-160 L/min. The practice shows that after adopting this scheme, the number of holes completed per month reaches 40 and the completion rate reaches 80%. The gas extraction concentration in the flushing hole is high and the gas attenuation is slow. After 50 days of extraction, the gas volume fraction in the flushing hole is 40%-60%, which is 2-3 times of that in the ordinary hole. After 120 days of extraction, the gas volume fraction in the flushing hole is still 20%. Hydraulic flushing effectively improves the gas extraction effect and reduces the gas content in coal seams. The average gas volume fraction of return air flow decreases to below 0.5%. The average daily footage of the working face increases from 2.4 m to 3.2 m, which improves productivity.http://www.gkzdh.cn/article/doi/10.13272/j.issn.1671-251x.17966coal and gas outburstgas extractionhydraulic flushingcoal deformationcoal body pressure reliefcoal seam crack and permeability increasement |
| spellingShingle | ZHANG Jianguo ZHAI Cheng Pressure relief law and application of deep-buried high-stress bedding coal by hydraulic flushing Gong-kuang zidonghua coal and gas outburst gas extraction hydraulic flushing coal deformation coal body pressure relief coal seam crack and permeability increasement |
| title | Pressure relief law and application of deep-buried high-stress bedding coal by hydraulic flushing |
| title_full | Pressure relief law and application of deep-buried high-stress bedding coal by hydraulic flushing |
| title_fullStr | Pressure relief law and application of deep-buried high-stress bedding coal by hydraulic flushing |
| title_full_unstemmed | Pressure relief law and application of deep-buried high-stress bedding coal by hydraulic flushing |
| title_short | Pressure relief law and application of deep-buried high-stress bedding coal by hydraulic flushing |
| title_sort | pressure relief law and application of deep buried high stress bedding coal by hydraulic flushing |
| topic | coal and gas outburst gas extraction hydraulic flushing coal deformation coal body pressure relief coal seam crack and permeability increasement |
| url | http://www.gkzdh.cn/article/doi/10.13272/j.issn.1671-251x.17966 |
| work_keys_str_mv | AT zhangjianguo pressurerelieflawandapplicationofdeepburiedhighstressbeddingcoalbyhydraulicflushing AT zhaicheng pressurerelieflawandapplicationofdeepburiedhighstressbeddingcoalbyhydraulicflushing |