高应力软岩回采巷道支护技术研究

Research on Support Technology of High Stress Soft Rock Mining Roadway

船景煤矿2#煤层埋深达600 m,且直接底板为铝质泥岩,遇水易膨胀,围岩层理发育,变形破坏严重,影响了矿井的正常安全。以1122运输巷为例,在巷道现场变形破坏形式的基础上,分析其破坏特征,阐述了1122运输巷围岩变形破坏机理,提出了强顶固帮及减跨补强控底的支护方式,设计采用单体支柱配合锚网索的支护技术方案。利用FLAC2D数值模拟出巷道支护前后的围岩应力状态、变形特征,并验证了支护方案的可靠性。现场矿压观测结果表明,该支护方案较好地控制了1122运输巷的变形,保证了巷道围岩的稳定性,为类似高应力软岩回采巷道支护提供了参考。

The No.2 coal seam of Chuanjing coal mine is at 600 m depth and floor lithology is made of alumi-num mudstone which will swell easily when meet water,the bedding of surrounding rock develops,it distorts and damages seriously which affects the normal production.Takes 1 122 transportation roadway for instance and bases on the foundation of roadway field deformation and destruction,analyzes the failure characteristics,describes the mecha-nism of surrounding deformation and destruction,puts forward the support way that reinforces roof and side,reduces span,reinforces and controls floor,the project adopts the support technology scheme that single prop combines with bolt-net-cable.Utilizes FLAC2D simulation software,simulates the stress state and deformation characteristic of sur-rounding rock before and after roadway support,and verifies the reliability of support scheme.The field weighing ob-servation results shows that the support scheme controls the deformation of 1 122 transportation roadway preferably,en-sures the stability of roadway surrounding rock,it can provide a reference for similar high stress in soft rock roadway support.