Stability Analysis on Excavation of Layered Surrounding Rock Tunnel with Weak Interlayer
Aiming at the problems of frequent diseases in the construction and operation of layered surrounding rock tunnel with weak in-terlayers,a calculation model of layered surrounding rock tunnel excavation with weak interlayers was established based on the engineer-ing background of Hailuoyu Tunnel,and the influence of the thickness of weak interlayers,the relation between the relative position of the tunnel and the joint angle θ of layered surrounding rock on the deformation of surrounding rock during tunnel excavation was studied ac-cording to the actual engineering situation.The results show that the model can simulate the mechanical response of the layered surround-ing rock tunnel with weak interlayer,and the deformation value of the surrounding rock increases gradually with the change of the thick-ness of the weak interlayer and its relative position,and is symmetrically distributed with the change of the joint dip angle of the layered surrounding rock,and the axis of symmetry is close to 90°.The sensitivity analysis shows that the thickness of soft interlayer has the most significant influence on the deformation of tunnel surrounding rock,followed by the relative position and joint dip angle.
万方数据
维普
