大连地铁车站基坑变形特性分析

为了研究大连地铁车站基坑变形特征以及基坑变形与开挖深度的关系,采用统计分析、数值拟合相结合的方法,通过对基坑实测数据的分析,结果表明:大连地区基坑墙后地表沉降最大值约为基坑深度的0.154%,基坑围护结构最大侧向位移值约为基坑深度的0.159%;最大地表沉降值与围护结构最大侧向位移值比为0.97,近于相等.研究结果可对后续地铁车站建设的设计提供一定依据,初步经济有效地控制由于车站深基坑变形引起的周围地层的移动.

Deformation characteristics analysis on foundation pit at Dalian subway station

Foundation pit engineering is a comprehensive engineering system.Currently the research on the deformation of deep foundation pit,in particular subway foundation pit,is limited.This paper investigates the deformation characteristics of subway foundation pit and the relationship between pit deformation and excavation depth at Dalian subway station foundation pit.Using the methods of statistical analysis and numerical fitting,the measured data from foundation pit are analyzed.The results show that the maximum of surface settlement is about 0.154 % of foundation pit depth,the maximum of lateral displacement of retaining structure is about 0.159 % of foundation pit depth.In addition,the maximum value of ground settlement and the maximum lateral displacement of retaining structure is very close to 0.97.Through the statistical result analysis,it provides a basis for the follow-up construction design on subway station.Therefore,the movements of ground surrounding the subway station caused by deep foundation pit deformation can be economically and effectively controlled.