摘要
以苏州阳澄西湖明挖隧道为例,利用二维有限元数值模拟,分析旧河道软弱土区域基坑联合降水开挖支护全过程。将模拟所得的基坑侧向变形、基坑外地表沉降和建筑角点沉降,与现场监测数据进行了对比,并重点分析基坑施工对紧邻建筑物所产生的影响。结果表明:建筑会产生向坑内方向的倾斜,垂直于基坑边线侧易出现不均匀沉降所致裂缝,但落底式止水帷幕能够有效减小联合降水对周边环境的影响。
Taking Yangcheng West Lake open excavated tunnel in Suzhou as an example,the whole process of combining dewatering,excavation and support of foundation pit in soft soil area of old river channel is analyzed by using two-dimensional finite element numerical simulation.The comprehensive lateral deformation,surface settlement and corner settlement of foundation pit are compared with the field monitoring data,and the impact of foundation pit construction on adjacent buildings is analyzed.The results show that the building tilts towards the pit,and cracks caused by uneven settlement are easy to appear on the side,which are perpendicular to the sidelines of the foundation pit,but the bottom-down waterproof curtain can effectively reduce the impact of combined dewatering on the surrounding environment.
作者
宋红红
SONG Honghong(China Railway 20th Bureau Group 1st Engineering Co.,Ltd.,Suzhou 215151,China)
出处
《国防交通工程与技术》
2022年第4期38-43,共6页
Traffic Engineering and Technology for National Defence
基金
中铁二十局科技计划项目(YF1901SD03B)。
关键词
深基坑
降水开挖
数值模拟
流固耦合
承压水
deep foundation pit
dewatering excavation
numerical simulation
fluid solid coupling
confined water
