深井高瓦斯碎裂软岩底抽巷围岩控制技术

Surrounding Rock Control Technology for Bed Plate Tunnel with High Gas Fracturing Soft Rock in Deep Well

以某矿高瓦斯工作面碎裂软岩底抽巷为研究对象,通过理论分析、现场调研及实测等方法,分析了底抽巷围岩支护结构破坏特征、破坏演化过程及其稳定性因素,对其围岩控制技术进行了深入系统研究。结果表明:底抽巷破坏的主要原因是其围岩强度低、软化吸水膨胀及其在强采动、高应力状态下的长期扩容变形;现场围岩变形观测和钻孔窥视发现围岩整体变形严重并呈明显不对称状态,尤其是采动一侧顶板和帮部。针对性地提出"多支护结构体"围岩控制系统并应用于工程现场,取得了良好效果。

Taking the bed plate tunnel of broken soft rock under high gas working face as the object of the study, its failure characteristics, damage evolution process and stability factors of surrounding rock and support structure are analyzed, meanwhile,the surrounding rock control technology is systematically researched through theoretical analysis, field investigation and laboratory test. Research results show that： the damage of bed plate tunnel is mainly due to its low strength of surrounding rock, softening and water absorption expansion and the long term expansion deformation under strong mining and high stress; field observation and drilling inspection of surrounding rock deformation found that the whole surrounding rock was seriously deformed and showed obvious asymmetry, especially the roof and upper part of mining side; the surrounding rock control system of multiple support structures（MSS） is proposed and the proposed method was successfully applied to the coal mine.