峻德煤矿倾斜煤层开采沿空侧巷道诱冲机理研究

针对峻德煤矿倾斜煤层开采期间沿空侧巷道冲击地压频发的问题,采用现场调研、微震监测、物理相似模拟和数值模拟相结合的方法开展了研究,结果表明:倾斜煤层工作面开采期间靠近沿空侧巷道的覆岩关键层更容易破断产生剧烈动载扰动;随着煤层倾角减小,沿空侧巷道煤柱帮应力集中程度减小,实体煤帮应力集中程度增大,应力集中由煤柱帮内向实体煤帮内转移;在动静载叠加作用下导致巷道两帮煤体失稳破坏诱发冲击地压,且不同倾角煤层冲击启动区域不同。研究结果对倾斜煤层工作面后续回采阶段卸压防冲工作具有一定的指导作用。

Study on mechanism of rock burst induced by gob-side entry in inclined coal seam mining in Junde Coal Mine

In view of the frequent occurrence of rock burst induced by gob-side entry in inclined coal seam mining in Junde Coal Mine,field investigation,microseismic monitoring,physical analogy simulation and numerical simulation were used to carry out the research.The results show that the key overlying strata near gob-side entry in inclined coal seam mining are more likely to break and produce violent dynamic load disturbance;with the decrease of coal seam inclination angle,the stress concentration degree along the roadway pillar in gob-side entry decreases,the stress concentration degree of solid coal side increases,and the stress concentration transfers from the pillar side to the solid coal side;the dynamic and static load leads to the instability failure of the two sides of the roadway coal body to induce rock burst,and the impact starting area of different inclined coal seam is different.The research results provide some guidance for pressure relief and scour prevention in the following mining stage of inclined coal seam working face.