摘要
以兰州某深基坑工程为背景,对开挖过程中基坑变形进行监测和研究。结果表明:随着开挖深度的增加,围护桩向基坑内部发生前倾,围护桩顶水平位移最大为13.8 mm,开挖深度继续增加,桩体的最大水平位移逐渐下移,桩体的变形由前倾型向弓型过渡,基坑周围地表沉降的形状与是否施加钢支撑有关,未施加钢支撑时地表沉降呈三角形,最大沉降在基坑边上,为10.8 mm,施加钢支撑时地表沉降呈凹槽形,最大沉降在距基坑1/3基坑深度处,为14.8 mm。
Taking a deep foundation pit engineering in Lanzhou as the background,the deformation of the foundation pit during excavation is monitored and studied.The results show that with the increase of excavation depth,retaining pile will tilt toward the foundation pit,the most horizontal displacement on top of retaining pile is 13.8 mm,with the further increase of excavation depth,the maximum horizontal displacement of pile will go down gradually,the deformation type of the pile transits forward to bow,the shape of surface subsidence surrounding the foundation pit has a relationship with whether applied steel support or not,surface subsidence will become a triangle without steel support,the largest settlement in the foundation pit edge is 10.8 mm,surface subsidence will become a groove when applied to the steel support,and the largest settlement from the foundation pit at a depth of 1 /3,is 14.8 mm.
出处
《铁道建筑技术》
2016年第5期92-95,共4页
Railway Construction Technology
基金
中铁二十一局集团有限公司科技研究开发计划项目(14C-8)
关键词
深基坑
围护结构
变形
监测
deep foundation pit
retaining structure
deformation
monitoring
