南京地铁基坑支护结构的MSD综合刚度及变形预估研究  

MSD synthetic system stiffness and deformation prediction of support structure for deep excavation in Nanjing subway

作　　者：徐洪钟 孙鹏鹏 崔文森 孙义杰 XU Hongzhong;SUN Pengpeng;CUI Wensen;SUN Yijie(College of Transportation Science ＆ Engineering,Nanjing Tech University,Nanjing,Jiangsu 210009,China)

机构地区：[1]南京工业大学交通运输工程学院,江苏南京210009

出　　处：《中国矿业大学学报》2018年第4期907-912,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金青年项目(41702315);江苏省高等学校自然科学研究面上项目(16KJB410001);江苏省青蓝工程项目

摘　　要：在Clough综合刚度的基础上,提出了改进的深基坑支护结构MSD综合刚度.在考虑围护结构、支撑体系与场地土层条件下,分析了不同工程地质条件下南京地区地铁车站深基坑支护结构综合刚度特性,建立了深基坑综合刚度与围护墙最大侧移的经验公式.结果表明:改进的MSD综合刚度可以较好地反映不同地质条件下基坑支护结构的整体变形特性.基坑围护结构最大侧向变形与综合刚度呈递减函数关系,当综合刚度增大到一定值后,其变形值趋于恒定.采用该方法预估了南京地区地铁深基坑的围护结构最大侧移,计算结果与实测值吻合度较好,表明经验公式可用于预估相似地基上的深基坑最大侧移.A mobilized strength design（MSD）synthetic system stiffness was proposed on the basis of Clough system stiffness.Considering the surrounding structure,support system and the soil stiffness,system stiffness of retaining structures under different engineering geological conditions in Nanjing was studied.The empirical equation between maximum horizontal displacements of the retaining wall and the stiffness was established.Results show that the proposed MSD system stiffness can better describe the deformation of the retaining structure under different geological conditions.The maximum deformation of the retaining structure decreases with the increase of the system stiffness,and tends to be constant when the stiffness grows to a certain value.The method was applied to deep excavations of Nanjing subway,and the calculation results are in good agreement with the measured values,which indicates that the empirical formula can be used to predict the maximum horizontal displacement of the retaining wall with similar excavations.

关 键 词：深基坑 围护结构 综合刚度 侧向位移 预估 

分 类 号：TU476.3[建筑科学—结构工程]