同忻煤矿切顶卸压沿空留巷技术应用  

Application of Roof Cutting Pressure Relief Technology along Goaf and Roadway Retaining Technology in Tongxin Coal Mine

作　　者：张弘弦 ZHANG Hongxian(safety production command center,Jinneng holding coal industry group,Datong037000China)

机构地区：[1]晋能控股煤业集团安全生产指挥中心,山西大同037000

出　　处：《煤矿现代化》2021年第6期175-178,共4页Coal Mine Modernization

摘　　要：同忻煤矿为提高工作面煤炭回收率,避免煤柱留设造成的资源浪费,在三盘区8206工作面采用沿空留巷的布置方式,为保证留巷能够满足使用要求,结合工作面地质环境,利用切顶卸压技术进行沿空留巷。通过实验分析,预裂爆破钻孔角度为75°,孔径为50 mm,孔深为16 m,装药长度为4 m,封孔长度为5 m,孔间距600 mm,装药量为450 g/m。监测结果表明:留巷围岩没有出现应力集中现象,围岩变形情况得到控制,留巷能够满足生产需求。In order to improve coal recovery in working face and avoid resource waste caused by coal pillar retention,Tongxin Coal Mine adopts the gob-side entry retention arrangement in 8206 working face of the third plate area.In order to ensure that the entry retention can meet the use requirements,combined with the geological environment of the working face,the roof cutting pressure relief technology is used to keep gob-side entry retention.Through experimental analysis,the pre-splitting blasting drilling Angle was 75°,the hole diameter was 50mm,the hole depth was 16m,the charging length is 4m,the hole sealing length is 5m,the hole spacing was 600mm,and the charging volume was 450g/m.The monitoring results showed that there was not stress concentration phenomenon in surrounding rock of retaining roadway,the deformation of surrounding rock was controlled,and the retaining roadway can meet the production demand.

关 键 词：沿空留巷 煤炭回收率 切顶卸压 预爆破参数 变形监测 

分 类 号：TD323[矿业工程—矿井建设]