考虑应力路径的非对称不等深地铁车站基坑开挖变形研究  

Research of Excavation Deformation of Asymmetric and Unequal Deep Foundation Pits in Subway Considering Stress Paths

作　　者：朱海军 钟振涛 修正诚 程浩 王俊[2] ZHU Haijun;ZHONG Zhentao;XIU Zhengcheng;CHENG Hao;WANG Jun(Nanjing Metro Construction General Contracting Project Department,China Railway Corporation,Nanjing Jiangsu 210000 China;School of Civil Engineering,Nanjing University of Technology,NanjingJiangsu 211816China)

机构地区：[1]中国中铁股份有限公司南京地铁施工总承包项目部,江苏南京210000 [2]南京工业大学土木工程学院,江苏南京211816

出　　处：《江苏建筑》2024年第5期114-119,共6页Jiangsu Construction

基　　金：地铁车站基坑异步开挖变形及对周边环境影响监测系统开发与智能预测(202210166)。

摘　　要：文章针对南京地铁某换乘车站非对称不等深基坑变形问题,采用修正摩尔-库伦土体本构模型,考虑基坑开挖过程中土体应力变化路径,采用Midas GTS NX软件建立了基坑及周边建筑物的耦合作用模型,根据建筑物基础类型施加约束条件,同时考虑了基坑周边建(构)筑物影响,模拟分析非对称不等深基坑地表沉降变形和地连墙水平位移,并与现场实测的位移数值吻合较好,验证了考虑应力路径后的修正MC模拟实际开挖施工过程的准确性和可靠性,为同类基坑开挖工程提供参考。For the deformation problem of asymmetric unequal deep foundation pit in an interchange station of Nanjing Metro,the Modified Moore-Cullen(MC)soil ontological model is adopted to consider the soil stress change path during the excavation process of the foundation pit.The coupling model of the foundation pit and the surrounding buildings is established by Midas GTS NX software,and constraints are imposed according to the type of the foundation of the building.The influence of the surrounding structures in the foundation pit is taken into consideration to analyze the deformation of the ground surface of the asymmetric unequal deep foundation pit and the horizontal displacement of the ground wall after considering the stress path.Asymmetric unequal deep foundation pit surface settlement deformation and horizontal displacement of the ground connecting wall match well with the field measured displacement values,verifying the accuracy and reliability of the modified MC simulation of the actual excavation construction process after considering the stress paths,and providing a reference for the excavation of similar foundation pit projects.

关 键 词：基坑开挖 地铁换乘车站 应力路径 本构模型 

分 类 号：U452.11[建筑科学—桥梁与隧道工程]