Numerical Simulation Study on the Excavation Process of Foundation Pit of Long Open-Cut Tunnel
In order to study the influence of three support methods on the stability of foundation pit in weak soil area,this paper takes the new open-cut tunnel of Tianjin-Weihai high-speed railway as the engineering background,the numerical simulation study was carried out by using ABAQUS finite element software,and the displacement and deformation law of the foundation pit under dif-ferent support modes were compared and analyzed.The results show that the horizontal displacement at the top of the slope under the three excavation methods is"fan-shaped".In terms of surface settlement,in the slope excavation stage,the three types of exca-vation gradually decrease from the top of the slope to the distance from the foundation pit,and after the enclosure structure is set,the settlement change of the enclosure structure is distributed in a"spoon"shape.The uplift deformation diagram at the bottom of the pit is in the shape of a"bowl",and after the enclosure structure is set,the"bowl"shape is closed from the outside of the two sides of the support to the middle.Under the three support modes,the displacement is the smallest when spraying the anchor sup-port,and the displacement of the ground wall support is the smallest after the enclosure structure is set.The comparative analysis of the displacement results of the three excavation methods shows that the ground wall enclosure structure is the most stable,followed by the SMW construction pile,and the stability of the spray anchor support is the lowest.
soft soildeep foundation pitnumerical simulationfoundation pit deformation
万方数据
维普
