动静载荷下深部开挖巷道围岩变形破坏特征及支护优化

Deformation and Failure Characteristics of Surrounding Rock and Support Optimization on Deep Excavation Roadway under Dynamic and Static Combined Loading Condition

为了研究动静载荷对深部开挖巷道围岩变形破坏的影响规律,以马家田煤矿深部回采巷道为研究对象,运用FLAC3D数值软件对动静载荷下深部开挖巷道围岩力学响应进行了分析,并结合现场巷道实际提出支护优化方案。结果表明:动载荷作用下巷道围岩变形破坏范围较为充分,硬岩中主要发生拉伸破坏,软岩中主要发生剪切破坏。巷道围岩最大垂直位移与破坏深度随巷道开挖距离的增加而增加。新的支护措施较好地控制了围岩变形,保证了矿井的安全生产。研究成果可为相同或相似条件下深部巷道围岩稳定性控制及支护设计提供参考和借鉴。

To study the influence of dynamic and static combined loading on the deformation and failure of the deep excavated roadway surrounding rock, take the deep mining roadway in Majiatian coal mine as the research object, the mechanical response of the deep excavated roadway surrounding rock under dynamic and static combined loading is analyzed by using FLAC3Dnumerical software, and the support optimization scheme is put forward combined with the actual situation of on-site roadway.The results show that the deformation and failure range of the surrounding rock of the roadway is relatively sufficient under dynamic load is more sufficient than that under static load. Tensile failure mainly occurs in hard rock while shear failure mainly occurs in soft rock. The maximum vertical displacement and failure depth of the roadway surrounding rock increase with the increase of the roadway excavation distance. The new supporting measures better control the deformation of surrounding rock and ensure the safety of mine production. This research provided reference for the supporting design and stability control of deep roadway surrounding rock under same or similar conditions.