Analysis of soil movement around a loaded pile induced by deep excavation

Abstract

The change of the bearing capacity of an adjacent pile induced by the excavation of a foundation pit involves the complex interaction between the retaining structure, soil, and loaded pile. Thus, the study of the displacement field of the soil around the pile is very important. A three-dimensional finite element model was established and the influence of pile spacing and pile-cap spacing on the displacement of soil around the pile was analyzed. The pile foundation could restrain the settlement of the soil around the pile. In addition, the soil within 20 m below surface was obviously affected with an influence coefficient of 0.7. The results show that when the pile-cap spacing is less than 50 m, the soil settlement coefficient changes approximately linearly. Moreover, an empirical formula is obtained for the reduction coefficient.