某国际贸易大厦基坑支护数值分析  

Numerical analysis of foundation pit supporting for an international trade building

作　　者：余湘娟[1] 王福彬[2] 高磊[1] 周斌[1] 

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]南京市市政设计研究院有限责任公司,江苏南京210008

出　　处：《江苏大学学报（自然科学版）》2014年第3期359-365,共7页Journal of Jiangsu University：Natural Science Edition

基　　金：河海大学中央高校基本科研业务费专项资金资助项目(2012B02314);中国博士后科学基金资助项目(2012M511193);江苏省博士后科研资助计划项目(1102073C);高校博士学科点专项科研基金资助项目(20120094120015)

摘　　要：根据某国际贸易大厦基坑开挖现场的实际情况及其施工过程,采用有限元程序ABAQUS,建立基坑支护三维数值分析模型,通过改变支撑、地下室的楼板和预加应力的大小,考虑不同基坑支护形式,分析了5种工况条件下基坑坑底回弹隆起情况,并与实测结果进行对比,验证所建数值分析模型的合理性.研究表明:支撑对基坑坑底回弹隆起的影响主要集中在地连墙附近,并随基坑宽度增大而增大;基坑中部位置坑底回弹隆起变形最终收敛;基坑形状的不对称对于小矩形基坑的影响较大,对大矩形基坑的影响较小,基坑坑底回弹隆起呈对称形状;地连墙的变形越大,墙后土体变形越大,其坑底回弹隆起量越小.According to the actual condition and construction process of an international trade building engineering, the three dimensional numerical analysis model of the foundation pit supporting was established by the finite element program of ABAQUS. Changing the support, floor and pre-stress, the diffe- rent forms of foundation pit supporting were considered to analyze the bottom of pit rebound uplift under five work conditions. Compared with the measured results, the rationality of numerical analysis model was verified. The result shows that the influence of foundation pit supporting on the bottom of pit rebound uplift is mainly in the diaphragm wall, and increases with the width of foundation pit. The bottom rebound uplift deformation at the central position of foundation pit is finally converged. The asymmetric shape of foundation pit influences the small rectangular pit greatly, and lightly influences the large rectangular pit. The shape of pit bottom rebound uplift is symmetrical. The soil deformation behind the wall increases with the increasing of diaphragm wall deformation, while the bottom rebound uplift deformation is decreased.

关 键 词：基坑支护 ABAQUS 支撑 坑底回弹隆起 地连墙 

分 类 号：TU113.547[建筑科学—建筑理论]