拱盖法暗挖地铁车站设计中的岩层适应性数值模拟研究

Numerical Simulation of Rock Adaptability of Subway Station with Arch Cover Method

为探讨拱盖法暗挖车站在地层中的适应性、合理选择设计参数,研究了不同岩层条件下关键部位的应力和变形规律。通过有限元数值模拟分析并经施工监测数据对比,得出结论:拱顶以上岩层的风化程度对地表沉降影响大;沉降主要发生在拱盖开挖过程;拱脚应置于稳定岩层且应加强支护措施。

In order to discuss the adaptability and reasonable selection of design parameters of underground excavation station with arch cover method, the stress and deformation laws of key parts under different rock conditions are studied. Through the finite element numerical simulation analysis and the comparison of the construction monitoring data, it is concluded that: the weathering degree of the rock above the arch crown has a great influence on the surface settlement;the settlement mainly occurs in the excavation process of the arch cover;the arch foot should be placed in the stable rock stratum and the supporting measures should be strengthened.