地铁浅埋暗挖隧道管棚预支护数值模拟

摘要

The excavation and supporting type of shallowly buried and darkly excavated tunnel has an effect on the surrounding strata,which is a three dimensional space problem.The Lagrange finite difference software was adopted to simulate the effect of pipe roof pre-supporting on stratum settlement.The stratum displacements,the surface deformations and the forces of the pipe roof pre-supporting were analyzed at different construction stages.The results show that the use of pipe roof pre-supporting can reduce the stratum deformation in the construction process,achieving that the settlement value is in the allowed range.%浅埋暗挖隧道的开挖及支护方式对其周围地层的影响是三维空间问题,文中通过采用拉格朗日有限差分软件数值模拟管棚预支护对地层沉降的影响,对不同施工阶段下的地层位移、地表变形及管棚、初期支护的受力进行分析.结果表明,使用管棚预支护有效减少了地层在施工过程中的变形,将沉降值控制在允许范围.