矩形浅埋软岩隧道开挖非线性过程数值模拟

Nonlinear Process Numerical Simulation of a Rectangle Shallow Buried Soft Rock Tunnel Excavation Project

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,研究矩形隧道初期支护在开挖过程中大变形机制。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性大变形力学设计方法,以确保开挖施工安全。

Combining construction of a soft adjacent rock shallow buried covered excavation rectangle tunnel in coastal area, authors used a finite difference software, FLAC, to make a nonlinear numerical simulation of the divisional excavation, studied the large deformation mechanics of early supports of the rectangle tunnel in the excavation process. Analysis results indicate that the change of stress and strain of adjacent rocks and early supports is a nonlinear non-reversible process, and that the excavation plan adopting soft adjacent rock nonlinear large deformation mechanical design methods can ensure construction safety.