某深基坑围护桩结构性态监测与数值模拟研究  

Monitoring and Numerical Simulation of Structure Behaviour of Supporting Piles in a Deep Foundation Pit

作　　者：张新东[1] 姚爱军[1] 

机构地区：[1]北京工业大学岩土与地下工程研究所,北京1001242

出　　处：《地下空间与工程学报》2011年第6期1138-1142,共5页Chinese Journal of Underground Space and Engineering

基　　金：北京市教育委员会科技计划面上项目(KM200910005012)

摘　　要：以某城市轻轨换乘车站深基坑为背景,对开挖过程中支护结构的监测数据进行详细分析,并采用有限差分软件进行数值模拟,与现场监测数据进行对比研究。重点分析了围护桩的水平位移和钢支撑轴力的变化规律。结果表明,在排桩-钢支撑支护体系下,基坑开挖初期,桩身变形呈前倾型,第一道钢支撑架设之后,桩身最大位移点逐渐下移,整体呈"大肚"状。钢支撑对基坑支护结构的侧向位移有良好的抑制作用,但受架设时间、立柱状态、材料和温度等多种因素影响,需谨慎对待。研究成果对类似基坑工程的设计与施工具有借鉴意义。Based on the foundation pit of light rail in a city＇s transfer station,the monitoring data of retaining structures in the process of excavation are in detail analyzed,and by using the software of finite difference to execute the numerical simulation,the analyzed data are compared with the site monitoring data.The focus of this paper is to analyze the variation law of axial force of steel braces and the horizontal displacement of supporting piles.The results show that under the retaining system of row piles and steel braces,in the initial excavation of the foundation pit,the deformation of bracing pile appears to tilt forward,and after erecting the first steel brace,the biggest displacement point of bracing pile is moving downward gradually,the entirety appears to be a ＂convex shape＂.The steel braces can have a favorable function for inhibiting the lateral displacement of foundation pit＇s retaining structure,however under the influences of various factors,such as the time of erection,the state of column,material and temperature,etc,it should be taken cautiously.The achievement of this research provides a reference to the design and construction of the similar engineering.

关 键 词：深基坑 围护桩结构 现场监测 数值模拟 

分 类 号：TU473[建筑科学—结构工程]