软土地层深基坑施工对邻近地铁车站区间的影响分析

Analysis on the Infl uence of Deep Foundation Pit Construction in Soft Soil Stratum on Adjacent Subway Station Interval

某软土地层深基坑南侧邻近既有地铁车站区间,深基坑开挖卸载会对地铁的安全运营产生不利影响。文章采用有限元方法建立深基坑-车站-区间三维数值模型,研究深基坑开挖施工对车站区间的影响,结果表明:基坑开挖引起的最大地层变形为16.9 mm,区间隧道最大变形为4.6 mm,车站风亭最大变形为3.8 mm,均满足变形限制要求,基坑支护结构选型合理且可行。

The south side of a deep foundation pit in soft soil stratum is adjacent to the existing subway station interval.The excavation and unloading of deep foundation pit will have an adverse influence on the safe operation of the subway.This paper adopts the finite element method to establish a three-dimensional numerical model of deep foundation pit-station-interval to study the influence of deep foundation pit excavation on station interval.The results show that the maximum stratum deformation caused by foundation pit excavation is 16.9 mm,the maximum deformation of interval tunnel is 4.6 mm,and the maximum deformation of station pavilion is 3.8 mm,which all meet the requirements of deformation limitation.The selection of foundation pit support structure is reasonable and feasible.