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采用ANSYS非线性接触分析方法,考虑层理效应并应用于重庆四面山隧道V级砂泥互层段进行围岩稳定性分析及初期支护优化.研究表明:隧道开挖后拱顶下沉值为水平收敛值1.5~2.0倍,拱肩处锚杆受力较拱顶处大,拱腰及拱脚处锚杆几乎不受力;根据水平软硬互层隧道开挖后围岩变形及支护受力特点,优化锚杆支护,得出砂泥互层施工段可将与岩层夹角小于35°范围的锚杆取消.在原有方案及优化方案施工段进行现场测试,结果显示模拟及优化数值与测试值基本符合.研究成果可在类似隧道施工中推广应用.
The ANSYS nonlinear contact analysis method was used to analyze the bedding effect and applied to the sandstone interbedded V-stage sandstone in Chongqing Simianshan Tunnel for the analysis of surrounding rock stability and initial support optimization. The results show that: after tunnel excavation, The horizontal convergence value of 1.5 to 2.0 times the strength of anchor bolt at the shoulder than the arch at the arch waist and arch at the anchor almost no force; according to the level of soft and hard interlaced tunnel excavation of the surrounding rock deformation and branch Retaining force characteristics, optimizing the bolt support, resulting in interbedded sand and sand construction section can be less than 35 degrees with the anchor rock bolt canceled in the original program and optimization program construction site for field test results show that the simulation and The optimized values are in good agreement with the test values and the research results can be applied in similar tunnel construction.