基于流固耦合理论的郑州地铁隧道开挖数值模拟

摘要

以郑州地铁某区间的隧道施工为背景,采用基于流固耦合理论的COMSOL Multiphysics多物理场耦合的有限元软件对隧道开挖引起的地面沉降、不同的隧道埋深和地下水位进行数值模拟,并与现场实测结果进行对比分析.结果表明,隧道开挖前,渗流场的压力和应力场的有效应力沿水平方向均匀分布;地表沉降的数值模拟结果与实际较为接近;隧道埋深越深、地下水位越低对地表沉降的影响越小.%Taking the Zhengzhou metro tunneling as an engineering example and using fluid-structure coupling theory COMSOL Multiphysics finite-element analysis software,we do numerical simulation surface subsidence,the different tunnel buried depth and underground water level which are caused in the process of tunnel excavation.And the results are compared with on-site measurements.The results show that before the tunnel excavation,seepage and stress field are evenly distributed along the horizontal direction.Numerical simulation results reflect good engineering practice.The lower the tunneling depths and the groundwater level,the smaller the influence on surface subsidence.