近距离孤岛工作面沿空留巷偏应力分布规律及控制  

Distribution Law and Control of Deviatoric Stress in Gob-side Entry Retaining of Close Distance Isolated Island Working Face

作　　者：张婷华 ZHANG Tinghua(Anze Dengmaotong Coal Industry Co.,Ltd.,Linfen 031400,China)

机构地区：[1]安泽登茂通煤业有限公司,山西临汾031400

出　　处：《煤炭技术》2024年第8期129-132,共4页Coal Technology

摘　　要：为解决近距离条件下孤岛工作面复用沿空留巷围岩稳定性差、控制难的问题,以登茂通煤矿3107孤岛工作面复用沿空留巷为工程背景,通过数值模拟分析了复用沿空留巷围岩偏应力分布规律及其失稳破坏机制。结果表明:随着超前距离的减小,巷旁支护体、实体煤帮部应力高值区与2102采空区底板的贯通趋势增强,且偏应力峰值增大,破坏趋势增强。基于此提出了实体煤侧采用锚杆+注浆改性+锚索联合支护技术,巷旁支护采用单体支柱支护分区域控制技术。通过现场监测,最大两帮移近量分别为512.31、378.96 mm,锚杆、锚索支护构件结构稳定,有效保障了复用沿空留巷的围岩稳定性,可为类似条件下巷道控制提供借鉴。In order to solve the problem of poor stability and difficult control of the surrounding rock of the gob-side entry retaining in the isolated island working face under close distance conditions,taking the goaf retaining roadway in the 3107 isolated island working face of Dengmaotong coal mine as the engineering background,the distribution law of deviatoric stress in the surrounding rock of the goaf retaining roadway and its instability and failure mechanism were analyzed through numerical simulation.The results showed that as the advance distance decreased,the support body beside the roadway the trend of penetration between the high stress area of the solid coal seam and the bottom plate of the 2102 goaf is enhanced,and the peak value of deviatoric stress increases,which enhances the trend of failure.Based on this,a two-sided regional control technology is proposed.Through on-site monitoring,the maximum displacement of the two sides is 512.31 mm and 378.96 mm,respectively,ensuring the stability of the goaf retaining roadway.This can provide reference for the control of the roadway under similar conditions.

关 键 词：近距离 孤岛工作面 围岩 偏应力 支护 

分 类 号：TD322[矿业工程—矿井建设]