椿树垭隧道岩体结构特征与围岩稳定性分析

Analysis of Rock Mass Features and Surrounding Rock Stability in Chunshuya Tunnel

通过岩体结构面网络计算机模拟,得出了隧道围岩岩体结构特征,并分析了其对围岩稳定性的影响,同时采用ANSYS有限元分析软件对Ⅳ级围岩条件下初始状态、开挖后不支护、开挖后支护3种工况下的围岩位移、应力分别进行分析和稳定性评价,结果表明:开挖后不支护时围岩很容易失稳;而实施初期支护能保证围岩的稳定性,且设计的初期支护方式能够满足安全要求。

Through the computer simulation of rock mass structure surface network,this paper obtains the structural features of tunnel rock and analyzes their impact on the stability of surrounding rock.The paper also respectively analyzes the surrounding rock displacement and stress by using ANSYS under three kinds of operating conditions for Grade Ⅳsurrounding rock： initial state,no support after excavation and support after excavation.It is concluded that the surrounding rock tends to become instable when there is no support after excavation while the initial support can ensure the stability of surrounding rock.In addition,the design pattern of initial support meets the safety requirements.