【摘要】 为了总结分析狭长型地铁车站基坑分段应用不同支护形式的变形特征,依托无锡地铁4号线惠山古镇站基坑工程,进行现场监测。选取了地连墙、钻孔灌注桩和逆作支护三个类型断面进行数据统计分析。分析发现:逆作法支护断面变形区别于明挖法支护结构;钻孔灌注桩的水平位移主要发生在围护结构上部,地连墙水平位移则呈现中间大、两端小的趋势。分段基坑的数据分析对后续的研究及设计、施工具有参考意义。更多还原

【Abstract】 The deformation data of metro foundation pit with different supports were analyzed.Relying on the foundation pit project of Huishan Guzhen Station of Wuxi Metro Line 4,this paper introduced the geological condition and monitoring arrangement of foundation pit,and choosed three section types of diaphragm wall opencut section,diaphragm wall reverse section and cast-in-place pile open-cut section for data statistical analysis.It was found that the deformation of support section by reverse construction is different from that by open excavation;the horizontal displacement of cast-in-place pile mainly occurs in the upper part of the retaining structure,the horizontal displacement of underground diaphragm wall tends to be larger in the middle and smaller at both ends.The data analysis of the subsection foundation pit has reference significance for the follow-up research,design and construction.更多还原