综采工作面回采过上覆集中煤柱及采空区技术

摘要

In order to solve the large area of roof falling accident problem possibly occurred during the mining process of fully-mechanized coal mining face passing through overburden concentrated coal pillar and goaf,taking No.31201 fully-mechanized coal mining face of Shigetai Mine as a study object,an analysis was conducted on the causes of the roof falling accident occurred in the mining process of the coal mining face passing through overourded concentrated coal pillar and goaf.The results showed that according to the mine strata pressure observation condition of the coal mining face,three periodical roof weighting abnormal areas of the coal mining face were all in concentrated coal pillar of the room and pillar mining block and the goaf area in overburden No.22 seam,and a secondary roof structure occurred in No. 31201 fully-mechanized coal mining face which caused by the concentrated coal pillar and goaf area in No.22 seam.Influenced by the min-ing,the concentrated coal pillar and goaf in No.22 seam were failed and lost stability,dynamic mine load formed and finally a large area of roof falling accident occurred.According to the roof falling accident,the mine pressure observation,microseismic monitoring and measuring, internal displacement monitoring and measuring,surface ground observation,overburden concentrated coal pillar blasting and other techni-cal means applied could provide safety and technical protection to the continued mining of the coal mining face.%为解决综采工作面在回采过程中过上覆煤层集中煤柱及采空区易出现大面积冒顶事故的问题，以石圪台煤矿31201综采工作面为研究对象，对工作面过上覆煤层集中煤柱及采空区过程中出现的冒顶事故原因进行了分析。结果表明：根据工作面矿压观测情况可知，工作面3次周期来压异常区域均处于上覆22煤层房采区集中煤柱及采空区区域，22煤层房采集中煤柱及采空区导致31201综采工作面出现次生顶板结构，受采动影响22煤层集中煤柱及采空区破坏失稳，形成动载矿压最终产生大面积冒顶事故。针对冒顶事故，通过采取矿压观测、微震监测、岩层内部位移监测、地表观测和上覆集中煤柱爆破等技术手段，对工作面的继续回采提供了安全技术保障。