Stability Analysis of Deep Foundation Pit Excavation and Support of Yangcheng West Lake Open Cut Tunnel
The foundation pit engineering of Yangcheng Lake tunnel is characterized by large a-mount of earthwork excavation,poor geological conditions and special location,which is close to dankun super large bridge of Beijing Shanghai high speed railway,seriously affecting the safety and progress of foundation pit excavation.The engineering adopts the excavation by grading,and the slope adopts the excavation and support scheme of mesh spraying+soil nailing combined with well point dewatering.In view of the prominent problem of foundation pit stability,geotechnical calculation software Lizheng is used to check the overall stability,anti uplift stability and anti surge stability of two typical sections of foundation pit slope.At the same time,the process of foundation excavation was also simulated by u-sing FLAC3D numerical simulation software.The results of surface settlement,slope deformation and plastic zone development caused by foundation pit excavation are calculated to verify the stability of foundation pit construction.
open cut tunneldeep foundation pitoverall stabilitynumerical simulationFLAC3D