Research on the Stability of Surrounding Rock in Super-Large Section Tunnels of Urban Underground Interchange Hubs
In the context of the rapid development of the urban highway network,the number of the super-large section highway tunnels with four or more lanes is increasing,and their joints have a significant impact on the stability of the surrounding rock.To explore the influencing factors of through joints on the stability of surrounding rock,this paper takes Caijianweishan Tunnel as the engineering support and adopts the methods of indoor experiments and numerical simulations to study the deformation and failure characteristics of surrounding rock under different joint compositions.The results show that when there is only one-way joint in the surrounding rock,the sensitivity of the stability of the surrounding rock to different directions joint varies,with the order of X direction>Z direction>Y direction(the horizontal direction of the tunnel cross-section is X direction,the vertical direction is Y direction,and along the axial direction of the tunnel is Z direction).Under the combination of two-way joints in the surrounding rock,when the X-direction joint is combined with the Y-direction joint or the X-direction joint is combined with the Z-direction joint,the instability and failure of the surrounding rock are respectively determined by the inclination angles of the corresponding two-way joints.When the Y-direction joint is combined with the Z-direction joint,it is mainly determined by the inclination angle of the Z-direction joint.The influence of joint-related parameters on the stability of the tunnel from large to small is as follows:friction angle,normal stiffness,tangential stiffness,and cohesion,and the safety factor is positively correlated with each of the above parameters.
super-large section tunnelsurrounding rock deformationjointstabilitynumerical simulation
万方数据
维普
