上海某超深基坑分区开挖数值计算及模型参数分析  

Numerical Calculation and Model Parameter Analysis of Paritition Excavation of a Ultra⁃deep Foundation Excavation in Shanghai

作　　者：邵治理 贾宝荣 侯征宇 罗鑫 张顺 SHAO Zhili;JIA Baorong;HOU Zhengyu;LUO Xin;ZHANG Shun(Shanghai Mechanized Construction Group Co.,Ltd.,Shanghai200072,China)

机构地区：[1]上海市机械施工集团有限公司,上海200072

出　　处：《施工技术（中英文）》2024年第1期23-30,60,共9页Construction Technology

基　　金：上海市“科技创新行动计划”启明星项目(扬帆专项)(23YF1436800)。

摘　　要：以上海某挖深超过40m的超深基坑为分析案例,建立了超深基坑精细化流固耦合数值分析方法,通过实测数据和参数反演分析,研究了超深基坑多因素叠加耦合效应的围护结构变形分布规律和变形模式。研究表明:相较于浅层土体开挖,深层土体开挖的变形效应更加明显,分层开挖的变形量和变形速率逐渐增加;模拟基坑开挖变形效应时,考虑围护结构的刚度折减是必要的,坑底承压水层降水有利于控制基坑变形,降水后深层土体开挖变形速率显著减小;围护结构变形的空间效应显著,地下连续墙角部几何形式对围护结构侧移影响较大;计算结果可以较好拟合实测结果,预测最大误差可控制在20%以内。Taking an ultra-deep foundation excavaton with a depth of more than 40m in Shanghai as an analysis case,a refined fluid-solid coupling numerical analysis method for ultra-deep foundation excavation is established.Through the measured data and parameter back analysis,the deformation distribution law and deformation mode of the enclosure structure of the multi-factor superposition coupling effect of the ultra-deep foundation excavation were studied.The results show that the deformation effect of deep soil excavation is more obvious than that of shallow soil excavation,and the deformation amount and deformation rate of layered excavation increase gradually.It is necessary to consider the stiffness reduction of enclosure structures when simulating the deformation effect of foundation excavation.The dewatering of the confined aquifer at the bottom of the foundation excavation is beneficial to controlling the deformation of the foundation excavation,and the deformation rate of deep soil excavation decreases significantly after dewatering.The spatial effect of the deformation of the enclosure structure is significant,and the geometric form of the corner of the underground continuous wall has a great influence on the lateral displacement of the enclosure.The calculated results can better fit the measured results,and the maximum error of prediction can be controlled within 20%.

关 键 词：深基坑 支护结构 变形 空间效应 反演 刚度折减 角部效应 

分 类 号：TU758[建筑科学—建筑技术科学]