Abstract：Soil unloading and rebound induced by large-scale deep excavation may affect the performance and integrity of existing piles inside the excavation zone,especially for up-lift piles.The non-linear finite element is employed to investigate the behavior of the up-lift piles in Shanghai Expo Underground Substation Project during deep excavation.Parameters of the subsoil are obtained by inverse analysis of the load tests on the up-lift piles.The behavior of the up-lift piles during deep excavation and under normal working load is analyzed by using the parameters.Results show that the tension force induced by excavation exerts a more negative influence on up-lift piles than normal piles.Therefore this pretension should be taken into consideration during pile design.Analysis shows the bottom-enlarged up-lift piles are subjected to a larger pretension force during excavation than ordinary up-lift piles.The pretension force of piles under working load can be deduced from the combination of the tension force induced by excavation and the tension force induced by working load.
陈锦剑；王建华；范巍；王卫东；. 抗拔桩在大面积深开挖过程中的受力特性分析[J]. 岩土工程学报, 2009, 31(3): 402-407.
CHEN Jinjian 1, WANG Jianhua 1, FAN Wei 1, WANG Weidong 2. Behavior of up-lift pile foundation during large-scale deep excavation. Chinese J. Geot. Eng., 2009, 31(3): 402-407.
