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深部软岩巷道承受高地应力作用,导致围岩产生流变大变形是影响其安全稳定的重要因素。以阳煤一矿西大巷工程为例,分析软弱围岩变形破坏机制;建立能够反映工程地质状况及初始设计方案的有限元模型,以现场监测变形数据和钻孔窥视围岩变形破坏深度为基础,反演获取围岩力学参数和蠕变参数。提出适合软弱流变岩体的可缓冲渐变式双强壳体支护方法,即根据围岩破坏情况进行分层注浆加固,并在最外部架设可缩性U型钢支架,形成可变形缓冲层。建立新型支护方案的有限元模型,利用围岩反演参数预测围岩变形情况,并通过与现场监测数据对比分析,验证了所提支护方案的有效性。
Deep soft rock roadway under high ground stress, leading to rheological deformation of the surrounding rock is an important factor affecting its security and stability. Taking the project of west side gateway of Yangmei No.1 Mine as an example, the deformation and failure mechanism of weak surrounding rock is analyzed. A finite element model reflecting the engineering geological conditions and initial design scheme is established. Based on the field monitoring deformation data and the depth of deformation and destruction of the rock peephole surrounding rock Basis, inversion Obtain mechanical parameters and creep parameters of surrounding rock. A kind of cushioning and gradual double-strength shell supporting method suitable for weak rheological rock mass is put forward, that is, grouting reinforcement according to surrounding rock failure and retractable U-shaped steel bracket at the outermost to form deformable buffer layer . The finite element model of the new support scheme is established. The surrounding rock deformation is predicted by the inversion parameters of the surrounding rock. The effectiveness of the proposed support scheme is verified by comparison with the field monitoring data.