极高地应力状态下大断面隧道全断面开挖围岩塑性变形数值模拟研究

Numerical Simulation Research on Plastic Deformation of Surrounding Rock During Full Cross⁃section Excavation in Large Cross⁃section Tunnel Under Extremely High Crustal Stress State

针对极高地应力状态下隧道全断面开挖时围岩状态和受力塑性分析的难题,采用建立极高地应力状态下大断面隧道全断面开挖围岩塑性计算模型,分析地应力分布特征。建立全断面开挖工况数值模拟模型,分析围岩位移特征和塑性区破坏情况,得出极高地应力状态下隧道全断面开挖围岩塑性变形特征,为研究类似工程问题提供参考。

In response to the difficulty of analyzing the surrounding rock state and stress plasticity during full cross⁃section excavation of tunnels under extremely high crustal stress condition,a plastic calculation model for surround⁃ing rock during full cross⁃section excavation of large cross⁃section tunnels under extremely high crustal stress condi⁃tion is established to analyze the distribution characteristics of crustal stress.The paper establishes a numerical simu⁃lation model under full cross⁃section excavation condition,analyzes the displacement characteristics of surrounding rock and the failure of plastic zone.The plastic deformation characteristics of surrounding rock during tunnel full cross⁃section excavation under extremely high crustal stress state is obtained,which can provide reference for studying similar engineering problems.