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. 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。