Abstract: This paper presents the finite element analysis results on the impact of soil lateral displacement on the performance of the adjacent composite ground. The composite ground consists of cementflyashgravel (CFG) columns. Under the lateral deflection, the response of the column and the soil between columns as well as the stress distribution are analyzed. The formula of estimating the column lateral deflection by considering the excavation depth and distance from the CFG column is also proposed.

Key words: Deep Excavation, Composite Ground, Lateral Displacement, Stress in the Columns