Time-space effect analysis on displacement of deep excavation of a subway station in Chengdu

摘要

The study on deformation of pit excavation of subway station located in pebbly sand is seldom researched. The deep-foundation pit of the Yangxi subway station on Chengdu Metro 2# Line is selected as a case to analyze its deforming process during excavation and the deformation difference on horizontal outline and vertical direction along typical retaining piles on base of deformation monitoring data, and then FEM is used to simulate the whole process of excavation, to repeat the evolution of excavation deformation, the distribution of shear stress and the plastic yielding zone. Finally, the paper summarizes the time-space evolution disciplines of subway station deep-foundation pit in Chengdu and give some valuable advices for pit retaining structure design and for safety construction.