In order to solve the problem of rock mass stability encountered in the excavation process of a shallow tunnel,the numerical simulation software 3DEC was used to simulate the excavation process of a tunnel in Jiyuan City,calculate the displacement,stress and plastic zone of the surrounding rock block,analyze the influence of the joint strength of the surrounding rock on the stability of the surrounding rock,and finally provide a support scheme.The simulation results show that both the left wall and the arch block will be unstable during excavation,which will lead to the collapse of surrounding rock.The stability of surrounding rock will be improved significantly with the increase of block joint strength.After the addition of supporting measures,the maximum displacement of the vault and the left wall is about 8 mm,which is close to the field monitoring result.
关键词
浅埋隧洞/3DEC/围岩稳定/节理岩体
Key words
shallow buried tunnel/3DEC/surrounding rock stability/jointed rock
维普
万方数据