长江科学院院报2017，Vol.34Issue(12)：106-110,121,6.DOI:10.11988/ckyyb.20160781
地铁深基坑分区开挖监测及数值模拟
Partition Excavation of a Subway Deep Foundation Pit: Monitoring and Numerical Simulation
摘要
Abstract
In practical engineering,rock mass in the long and narrow deep foundation pit of subway station is usually excavated in partitions.To obtain the stability rules of deep foundation pit excavated in partitions,finite difference software was adopted for numerical simulation.The deep foundation pit of a subway station in Hefei was taken as a case study.Through comparison between model results and field measurement results,the variation rules of retaining structure's lateral displacement and lateral support axial force and ground surface settlement during partition excavation were obtained.Results show that 1) field measurement results are in agreement with numerical simulation results,both within standard limits,indicating that the numerical model could well reflect the deformation characteristics of the foundation pit;2) with the proceeding of excavation,the "belly" of retaining structure bulged apparently,with the maximum displacement point moving towards the middle of the foundation pit;3) axial force of support developed rapidly in the early stage,and then tended to be stable;4) the adjacent ground surface settlement was in a groove shape,and the range within 40 m was affected by foundation pit excavation.The results could be taken as reference for the design and construction of similar projects.关键词
地铁车站/深基坑/分区开挖/变形监测/数值模拟Key words
subway station/deep foundation pit/partition excavation/deformation monitoring/numerical simulation分类
建筑与水利引用本文复制引用
谢沃,卢坤林,朱大勇..地铁深基坑分区开挖监测及数值模拟[J].长江科学院院报,2017,34(12):106-110,121,6.基金项目
国家自然科学基金项目(51078123) （51078123）
合肥市轨道交通项目(2015FFCZ0617,2016FFCZ0701) （2015FFCZ0617,2016FFCZ0701）
