关键词: 铁道工程, 地铁车站, 基坑工程, 结构变形, 灰色关联

Abstract: To study the lateral deformation characteristics of the biasing foundation pit enclosure structure of subway station, taking the foundation pit of a subway station for example, a three-dimension numerical simulation model was established by FLAC3D. The influence of e (the distance between building and foundation pit), q (the building load) and h (excavation depth of foundation pit) on the ratio of the maximum lateral displacement on both sides of the retaining structure of the biasing foundation pit in subway station was discussed. Furthermore, the division standard of deviation degree under each factor was established, and the corresponding deformation control measures were put forward. Meanwhile, the sensitivity of each factor was analyzed on the basis of the grey correlation theory to find out the most unfavorable factors. The research indicates that the biasing load caused by the adjacent buildings will greatly increase the lateral displacement of the retaining structure, which is adverse to the safety of the foundation pit. The ratio of the maximum lateral displacement on both sides of the retaining structure has a linear function with the distance “e”, a piecewise linear function with the depth “h”, and a cubic function with the building load “q”. The sensitivity order of influencing factors of unsymmetrical deformation of the retaining structure of the biasing foundation pit of adjacent buildings is as followed: distance between building and foundation pit “e”＞ building load “q”＞excavation depth “h”. The research conclusions can provide references for the design and construction of foundation pit.

Key words: railway engineering, subway station, foundation pit engineering, structure deformation, grey correlation