Abstract: This paper presents the stability analysis of a deep excavation project near the live municipal traffic load condition. The excavation sequences were numerically simulated with three-dimensional finite element software, PLAXIS 3D. In the numerical model, the stress and the displacement of the diaphragm wall were used as major indices for the evaluation of deep excavation under the municipal traffic loads. The results show that the maximum horizontal displacement of the diaphragm wall under municipal road traffic load occurs in the middle of diaphragm wall near the municipal road side, the maximum horizontal displacement of the diaphragm wall under the municipal road traffic load is significantly larger than that of under no traffic load condition; the maximum bending moment of the diaphragm wall near the municipal road side under the municipal road traffic load is higher than that of without the municipal road traffic load The maximum value under through load also increases significantly. 

Key words: deep excavation, traffic loads, deformation pattern, supporting structure, numerical simulation