Numerical analysis of dewatering-induced deformation of foundation pit

抄録

An uncoupling analysis method is traditionally used to evaluate the dewatering-induced deformation of the soil base in China, which is firstly conducted to obtain the seepage field of the soil base. Accordingly, the settlement of the soil base is calculated using the one-dimensional layer-wise summation method. In this paper, a FE method was employed to analyze the coupling behavior of seepage and deformation of the soil base induced by dewatering. The analysis results showed that the coupling analysis and traditional method yielded similar distributions of water head in the soil base. However, the deformation of the soil base obtained using the coupling analysis was significantly smaller than the one obtained using the traditional method. The distributions of the settlement with the different methods were various from each other. It can be concluded that the difference in the deformation of the soil base is mainly due to the effect of seepage force and the coupling of horizontal and vertical deformation, which could not be considered in the traditional method. The influence of the curtain depth in the pit was discussed with a series of numerical simulations.