Excavation Characteristics and Support Optimization of Extra-deep Special-shaped Foundation Pit:Taking Dashatian Station of Nanning Line 4 for Example
Based on the foundation pit engineering of an ultra-deep special-shaped subway station,a numerical model of engineering size is established to predict the deformation of foundation pit,and deformation control measures are put forward.Combined with numerical simulation and field monitoring methods,the stress and deformation mechanism of different retaining structures and supports during foundation pit excavation is revealed,and the reliability of deformation control measures is verified.The results show that the maximum horizontal displacement of the envelope structure appears at the fourth support,which is about 0.65 He(excavation depth).The surface settlement curve around the pit is in a"U"shape,and the surface settlement is positively correlated with the horizontal displacement of the foundation pit retaining structure.The deformation of the original design foundation pit is too large,and the deformation of the foundation pit can meet the engineering requirements after taking control measures.
deep foundation pitsubway stationsupport structurenumerical simulation
NETL
NSTL
万方数据
