Abstract: This paper presents the three-dimensional numerical analysis results of a deep excavation supporting system for a parking structure at Donghuan Road area using MIDAS GTS finite element analysis software. The deformation of the double-row pile cantilever supporting structure under the eccentric load was predicted and the stresses in the supporting structure were also discussed in the paper. The following results can be obtained: under the combination of adjacent environment and the complicated geological conditions, the supporting structure had larger deformations under the eccentric loads. At the beginning of excavation, the eccentric load at different surface elevations increased the displacements and internal forces in the supporting structure. With the increase of the excavation depth, greater deformation and displacement are identified. Under the eccentric load, the overall tendency of the double-row pile cantilever structure are deformed inside are more obvious, and the surface settlement also increases with the depth of the excavation with a concave-shaped curve. However, the influence of the eccentric load on the bottom heave is not obvious. The internal force of the eccentric load inside the pile is greater than that of piles with concentric load. The position of the maximum bending moment do not change significantly in both loading conditions.

Key words: double-row piles, eccentric loads, finite element method, deformation in deep excavation, displacements