孤岛工作面动力灾害预防控制方法研究

为研究孤岛工作面安全开采方法,理论分析其动力灾害多发的岩层运动及应力条件,并提出其安全开采的准则。认为只要合理设计开采参数,就可以避免孤岛工作面动力灾害的发生。分析表明:孤岛工作面长度大于相邻工作面支承压力影响范围之和时,孤岛工作面支承压力无法叠加,工作面较安全;相邻工作面长度大于关键层断裂步距时,覆岩关键层可充分塌垮,孤岛工作面无动压冲击危险;在稳定的内应力场开掘回采巷道时,回采巷道无冲击危险。

Study on the Prevention and Control of Dynamic Disasters at an Isolated Island Working Face

To study safe mining methods at an isolated island face, rock movement and stress conditions that could easily induce dynamic disasters under such conditions are analyzed theoretically, and criteria for safe mining in such locations are suggested. It was found that rational design of mining parameters can avoid dynamic disasters at isolated island faces. The results show that abutment pressure cannot be superposed and the working face is relatively safe if the length of the island face is larger than the sum of the abutment pressure ranges on adjacent faces. If the length of the adjacent face is larger than the fracture length of a key stratum, the overlying key stratum will fully collapse, and there will be no danger of dynamic pressure impact on the island face. Moreover, if a drifting roadway is located in a stable internal stress field, it has no danger of rock burst.