(1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Shanghai Lujiazui Finance and Trade Zone Development Co.，Ltd.，Shanghai 200127，China)
Abstract：Based on a case of deep excavation adjacent to metro station in Shanghai City，a two-dimensional finite element model to analyze this typical problem is proposed. Small-strain stiffness of soil is considered to investigate the deformation characteristics of deep pit excavation adjacent to metro station. The calculation data show that the deflection of retaining wall is obviously reduced when the small-strain stiffness of soil is considered in numerical analysis. And it is much close to the observed results. As for the deep pit excavation adjacent to metro station，the excavation sequences have obvious influences on the deformations of retaining wall. Numerical results also show that excavating big parts of the pit foundations firstly can reduce the deformation of retaining wall effectively than that of excavating small parts in advance. The results are consistent with the practical experiences in Shanghai area. The conclusions have some instructions for the designs and constructions of similar engineering.
