摘要
以佛山地铁3号线罗村站深基坑开挖工程为依托,通过对车站基坑开挖施工全过程监测数据进行分析,重点研究临近高层建筑物深基坑围护结构变形随基坑开挖深度和时间的变化规律,同时与基坑周边无压载下围护结构变形进行对比。通过建立三维有限元模型,对基坑开挖全过程进行模拟,再将模拟计算结果与实测数据进行对比分析。结果表明:临近建筑物侧的围护结构变形量比周边无压载下的小,在施加预应力钢支撑作用下,易出现反向位移;基坑开挖暴露时间越长,钢支撑应力释放越大,基坑变形越大;有限元计算结果与监测结果大致相同,表明在佛山软土地区采用内支撑+灌注桩的基坑围护结构是安全有效的,有利基坑安全。
Based on the excavation of the deep foundation excavation of Luocun Station on Line 3 of Foshan Metro,the monitoring data of the whole process of excavation of the foundation excavation of the station is analyzed,and the deformation of the retaining structure of the deep foundation excavation adjacent to the high-rise building is studied.The variation law of depth and time is compared with the deformation of the surrounding structure without ballast around the foundation excavation.By establishing a three-dimensional finite element model,the whole process of foundation excavation excavation is simulated,and the simulation results are compared with the measured data.The results show that the deformation of the retaining structure near the building side is smaller than that under the no-ballasting surrounding.Under the action of prestressed steel support,the reverse displacement is easy to occur;the longer the exposure time of the foundation excavation excavation,the steel support stress release The larger the deformation,the larger the deformation of the foundation excavation;the finite element calculation results are almost the same as the monitoring results,which indicates that the foundation excavation retaining structure with inner support+pouring pile in Foshan soft soil area is safe and effective,which is beneficial to the safety of the foundation excavation.
作者
刘嘉
彭秋旺
LIU Jia;PENG Qiuwang(CCCC Fourth Navigation Engineering Bureau Co.,Ltd.,Guangzhou,Guangdong 510290,China;School of Civil Engineering,Guangzhou University,Guangzhou,Guangdong 510006,China)
出处
《施工技术》
CAS
2019年第S01期688-692,共5页
Construction Technology
关键词
地铁车站
深基坑
变形
数值模拟
subway stations
deep foundation excavation
deformation
simulation
作者简介
刘嘉,高级工程师,E-mail:68126543@qq.com
