特厚煤层分层开采错距布置防治冲击地压技术

Technology of prevention and control of rockburst by staggered arrangement in layered mining of extra thick coal seam

Barapukuria煤矿(以下简称"孟巴煤矿")为厚硬顶板、特厚煤层,加之断层、张裂带以及孤岛煤柱等影响,开采过程中曾发生过冲击地压。针对该矿二分层1210工作面开采地质条件,采用错距布置方式将1210工作面轨道巷和胶带巷布置在一分层采空区下的底煤中,能从根本上降低1210工作面的冲击地压危险。采用数值模拟分析下分层巷道外错上分层采空区边缘不同距离的应力分布和位移量,通过开采过程中的微震分布验证错距布置和外错距离的合理性,对孟巴矿及其它厚煤层分层开采矿井巷道布置具有借鉴意义。

Barapukuria Coal Mine(hereinafter referred to as"Mengba Coal Mine")is a thick and hard roof,extra thick coal seam,in addition to the influence of faults,tension fracture zones and isolated island coal pillars,etc.,in the process of mining,there has been rockburst.According to the mining geological conditions of 1210 working face in the second layer of the mine,the way of stagger distance arrangement was adopted to arrange the track and belt grooves of 1210 working face in the bottom coal under the first layer of goaf,which can fundamentally reduce the risk of rockburst of 1210 working face.In this paper,the stress distribution and displacement of the different distance between the edge of the gob in the upper layer and the outside of the lower layer roadway were analyzed by numerical simulation.Through the distribution of microseisms in the mining process,the rationality of stagger distance arrangement and outside stagger distance was verified,which can be used for reference to the arrangement of roadways in Mengba Coal Mine and other thick seam layered mining mines.