Empirical Method and Finite Element Analysis of Deep Foundation Pit Excavation in Ningbo Soft Soil

Abstract

How to analyze and judge the excavation deformation of deep foundation pits in cities has become an urgent problem to be solved. Through the analysis of the excavation monitoring data of a deep foundation pit of a station on Ningbo Metro Line 3, the characteristics of horizontal displacement and surface settlement of the ground-connected wall during the foundation pit excavation in Ningbo soft soil area are obtained. And to compare and analyze the monitoring data by the empirical statistics method and the finite element method. Analysis shows that both can predict the deformation trend of foundation pit. However, due to the regional nature of the deep foundation pit engineering, the prediction accuracy of the empirical curve is poor. Compared with the empirical statistical method, the finite element method has better prediction accuracy, but the finite element method is more complicated. The advantages of the two methods can be applied in the project. In the study of deformation prediction of deep foundation pits, a more in-depth study of the combination of the two methods can be carried out.