浅埋隧道施工过程数值模拟分析

Analysis on the numerical imitates of shallow overburden tunnel excavating within soft rock

结合沿海地区软弱围岩浅埋暗挖矩形隧道施工，使用有限差分软件（FLAC）对分部开挖进行非线性数值模拟，研究矩形隧道软弱围岩在开挖过程中大变形的机理。分析结果表明：围岩和初期支护的应力应变是非线性不可逆过程，其开挖方案应采用软弱围岩非线形大变形力学设计方法，以确保开挖施工安全。

In this paper, combine the foreland soft rock shallow overburden the rectangle tunnel construction, FLAC is adopted to simulate the excavation of tunnel using partial excavation method, study the mechanism of rectangular tunnel primary support large deformation process. The analyze results have showed that the excavating process is a non-liner irreversible process tightly related with in the tunnel surrounding rock and primary support stress and strain.