Li Fenghui, Gu Yuming, Cheng Yunhai, Li Dong, Wang Yifan, Zhang Shuang
School of Mechanical and Electrical Engineering, Huainan Normal University, Huainan, 232000, China.
China Academy of Safety Science and Technology, Beijing, 100000, China.
Sci Rep. 2024 Oct 14;14(1):24040. doi: 10.1038/s41598-024-76133-2.
Coal and gas outbursts, along with rock bursts, are common dynamic disasters in coal mining, threatening the safety and green production of coal mines. The distribution of coal seam stress is an external factor contributing to coal mine power disasters. The drainage of confined water in coal seam roof is the primary factor of coal seam stress changes. Using theoretical analysis and numerical simulations, the influence of roof confined water on coal seam stress by looking at the law of stress and stress conservation transfer in the drainage layer is investigated. Our results show that: (1) after drainage, there is an increase in the local stress within the coal seam, with a stress concentration factor of 1.35. The influence range of theoretically calculated stress is consistent with the measured results. (2) the maximum value of drainage boundary stress correlated positively with the angle of the water-rich abnormal area, with a linear fitting of R = 0.98. These findings hold significant theoretical and practical implications for preventing and controlling dynamic disasters during the mining of water-rich coal seams.
煤与瓦斯突出以及冲击地压是煤矿开采中常见的动力灾害，威胁着煤矿的安全与绿色生产。煤层应力分布是导致煤矿动力灾害的外部因素。煤层顶板承压水的疏放是煤层应力变化的主要因素。通过理论分析和数值模拟，从排水层应力及应力守恒传递规律出发，研究了顶板承压水对煤层应力的影响。研究结果表明：（1）排水后，煤层内局部应力增大，应力集中系数为1.35。理论计算的应力影响范围与实测结果一致。（2）排水边界应力最大值与富水异常区角度呈正相关，线性拟合R = 0.98。这些发现对于防治富水煤层开采过程中的动力灾害具有重要的理论和实际意义。
