关键词: 临水深基坑, 不对称支护体系, 土体变形, 支护结构位移, 宽深比

Abstract: Based on the geological conditions of soft soils in Shanghai, a finite element analysis model is established to numerically simulate the excavations of two adjacent to waterfront considering two asymmetric support system, as well as to compare and study the deformation characteristic of the supporting structure and its controlling effect on the waterfront adjacent excavation under different support options. The results show that: the influence of the two support options on the stress and deformation of the excavations shows a similar trend of change in the process of layer-by-layer excavation. There is a more obvious difference in the deformation, in which the second support system can reduce the deformation of the excavation supporting system to a greater extent. The control effect on the earth pressure, the surface settlement and the lateral displacement of the supporting structure is more significant. The maximum horizontal displacement of the two sides of the excavation support is greatly affected by the width-to-depth ratio. The deformation amplitude is obvious, but when the width-to-depth ratio exceeds the critical value, its change has very little effect. This study indicate that the design of different support system programs for adjacent excavation near water can effectively control the unbalanced deformation of the excavation and provide reference value for the construction of similar projects.

Key words: Waterfront Adjacent Deep Excavations, Asymmetrical Supporting System, Soil Deformation, Displacement of Supporting Structure, WidthtoDepth Ratio