摘要
随着城市国土资源的日益开发,黄土地区城市空间日渐狭小,地下空间逐渐向更大更深的趋势发展。为满足黄土地区城市发展的需求,许多在建或已建基坑工程需继续扩挖,基坑扩挖可能对其周边结构物及土层产生不良影响。以施工中断数年的黄土深基坑工程为对象,基于依托工程的现场监测和数值分析结果,分析扩挖黄土基坑的变形及相邻结构的响应特征。依托工程的现场监测和数值分析结果表明:与常规的连续施工的工程相比,①扩挖基坑桩顶水平位移经历两次快速增长和变化较慢过程,即出现两次突变过程基坑开挖空间效应不明显,桩顶水平位移曲线近似为“S”形;②护坡桩桩顶沉降几乎不受降水影响;③护坡桩的悬臂端水平位移小于桩身中部水平位移。
With the development of urban land and resources,the urban space in the loess area is becoming increasingly smaller,and the underground space tend to develop larger and deeper.In order to meet the needs of urban development in loess area,many foundation pit projects under construction or already built need to be expanded.The expansion of foundation pit may have adverse effects on its surrounding structure and soil layer.Based on the field monitoring and numerical analysis results of the supporting project,the deformation of the expanded loess foundation pit and the response characteristics of adjacent structure are analyzed.The field monitoring and numerical analysis results of the supporting project show that compared with the conventional construction projects,①the horizontal displacement of the pile top of the expanded foundation pit has experienced two rapid growth and slow change processes,i.e.,there are two abrupt processes,the spatial effect of foundation pit excavation is not obvious,and the horizontal displacement curve of the pile top of the pit is approximately“s”shaped;②The top settlement of slope protection pile is hardly affected by precipitation;③The horizontal displacement of the cantilever end of the slope protection pile is less obvious than that of the middle of the pile body.
作者
戴兵强
刘寅昌
周国梁
杨东亮
DAI Bingqiang;LIU Yinchang;ZHOU Guoliang;YANG Dongliang(China Construction First Group Construction&Development Co.Ltd.,Beijing 100020,China)
出处
《南昌工程学院学报》
CAS
2021年第4期41-47,共7页
Journal of Nanchang Institute of Technology
关键词
基坑变形
相邻结构响应
现场量测
数值分析
扩挖黄土深基坑
foundation pit deformation
response of adjacent structures
field measurement
numerical analysis
expanded deep loess foundation pit
