关键词: 基坑, 地铁车站, 变形性状, 参数化分析, 遮拦效应

Abstract: Deformation behaviors of foundation pits adjacent to metro stations in different parameter groups (the distance, D, between the existing metro stations and foundation pits, the depth of the excavations, ) were examined via 36 comprehensive two-dimensional finite element parametric studies, which were compared with those without metro stations nearby. On the basis of the numerical analysis results, some major findings were obtained: (1) Maximum deflections of diaphragm walls closer to the metro stations became smaller and those of another side became greater; (2) The existing of metro stations had a remarkable influence on the ground settlements behind the walls far away from the metro stations when was closer to or greater than the depth of base slabs of metro stations. However, the settlement influence zone and the location of maximum ground settlement were not changed obviously; (3) As the increasing of , the shielding effect of metro stations became significant gradually when D was small. Nevertheless, the effect of on the shielding effect weakened by degrees as D became larger; (4) The ratios of maximum ground settlements behind the walls of excavations far away from the metro stations over the corresponding maximum diaphragm wall lateral deflections, δevm / δehm, were almost not effected by the existing metro stations. Moreover, δevm / δehm were effected by D and slightly.

Key words: foundation pit, metro station, deformation behavior, parametric study, shielding effect