北京交通大学学报2018，Vol.42Issue(1)：25-33,9.DOI:10.11860/j.issn.1673-0291.2018.01.004
天津地铁6号线车站深基坑开挖下围护结构及墙后地表变形特性分析
Analysis of ground surface deformation and retaining wall deflection characteristics under excavation of deep foundation pit of station in Tianjin subway line 6
摘要
Abstract
Based on the deep foundation pit project of Jinzhong Street Station in Tianjin Subway Line 6,numerical simulation is carried out by adopting FLAC3D to analyze the complete process of excavation and support of foundation pit.The key influence factors and the correlation between ground surface deformation and retaining wall deformation are then analyzed.The results show that,with the increase of excavation depth,excavation depth will have greater influence on the deformation,the maximum lateral displacement of the diaphragm wall will keep moving down,and the maximum ground settlement will gradually moving away from the edge of foundation pit.The lateral displacement of the diaphragm wall and the ground surface settlement tend to increase with the increase of foundation pit's length-width ratio,but the final values tend to remain steady.The foundation pit deformation is less influenced by the insertion ratio,while it is obviously influence by the thickness of diaphragm wall.With the increase of support stiffness,the lateral displacement of the diaphragm wall and the ground surface settlement tend to decrease,but the excessive support stiffness will not be supposed to meet the requirement of deformation control.Eventually,the ratio between the maximum ground surface settlement and the maximum lateral displacement is 1.15,and the ration between the envelop area of the ground surface settlement and that of the lateral displacement is 1.82.关键词
地铁车站/深基坑/变形特性/地表沉降/影响因素Key words
subway station/deep foundation pit/deformation characteristic/ground surface settlement/influence factor分类
交通工程引用本文复制引用
许树生,侯艳娟,刘美麟..天津地铁6号线车站深基坑开挖下围护结构及墙后地表变形特性分析[J].北京交通大学学报,2018,42(1):25-33,9.基金项目
中央高校基本科研业务费专项资金(C17JB00600) （C17JB00600）
国家自然科学基金(51738002)Fundamental Research Funds for the Central Universities(C17JB00600) （51738002）
National Natural Science Foundation of China(51738002) （51738002）
