南京地区地铁车站深基坑变形性状分析  

Deformation Behavior of Deep Excavations of Nanjing Subway Station in Different Engineering Geological Conditions

作　　者：徐洪钟 崔文森 胡文杰 XU Hongzhong;CUI Wensen;HU Wenjie(College of Transportation Science ＆ Engineering,Nanjing Tech University,Nanjing 210009,China)

机构地区：[1]南京工业大学交通运输工程学院

出　　处：《防灾减灾工程学报》2018年第4期599-607,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金(41072217);江苏省高校“青蓝工程”资助

摘　　要：收集了南京地区地铁车站深基坑实测数据，系统分析了南京地区不同工程地质条件下地铁车站深基坑变形特性。结果表明：①基坑围护结构最大侧移变化范围为（0．09％～0．24％）He，其中长江河漫滩区、秦淮河古河道区、阶地区的最大侧移乱。的平均值分别为O．13％He、0．18％He、0．16％He；②基坑围护结构最大侧移点埋深位置H。位于（He-8，He＋4．5）之间；③基坑围护结构的插入比主要在0．2～1．0；基坑稳定数在0．15～0．32范围内；基坑围护系统的综合刚度介于40．2～1452．9；④基坑地表沉降呈凹槽型分布形态。基坑周边最大地表沉降乱。变化范围为（O．023％～0．3670．4）He，最大地表沉降平均值约为0．167％He。阶地区的地表沉降值及范围小于河漫滩区、秦淮河古河道区的。δvm／δhm的变化范围为0．2～2．0。A database of many case histories of urban rail transit foundation pits in Nanking is ana- lyzed, and the deformation behavior due to deep excavation in different engineering geological conditions is presented and discussed. The results show： （1） the maximum lateral wall deflection 8hm of metro station excavation in Nanjing is in the range of （0.09%--0.24%）He, with the mean value being 0.13 % He in the Yangtze River flood plain, 0.18% Ho in the Qinhuai paleo-channel, and 0.16%He in the terrace; （2） the location of maximum lateral deflection Hm ranges from He-8 to He＋4.5; （3） the wall penetration ratio of metro station excavation in Nanjing ranges from 0.2 to 1.0, and the stability number ranges from 0. 15 to 0.32~ （4） the maximum ground surface settlement, δvm is falls in the range of （0. 023%--0. 367 %）Ho, with an average value of 0. 167MHe. The value and range of the ground surface settlement in the terrace are less than those in the floodplain and paleo-channel areas. The maximum ground surface settlement ranges from 0. 2δhm to 2δhm, and the average value is 1. 0δhm.

关 键 词：工程地质条件 地铁车站 深基坑 围护结构侧移 地表沉降 

分 类 号：TU43[建筑科学—岩土工程]