Analysis of Pit Corner Effect of Special-shaped Foundation Pit of Subway Station

Abstract

Based on the deep foundation pit project of Maluan North Station of Xiamen Metro Line 2, a large number of monitoring points were set up to monitor the foundation pit in order to study the deformation law and the pit corner effect during the excavation of the special-shaped foundation pit. By analyzing on-site monitoring data and numerically simulating the excavation of special-shaped foundation pits, this study found that the lateral deformation of diaphragm wall and ground settlement at the corner of the pit all exhibited obvious pit corner effect. The maximum lateral displacement of the long-side diaphragm wall is slightly larger than that of the short-side diaphragm wall. The maximum ground settlement at the corner of the pit is less than the maximum ground settlement behind diaphragm wall. Moreover, the differential ground settlement around the pit corner is obvious.