摘要
城市建筑物密集区深基坑开挖必然引起周围土体侧向移动,使邻近桩基产生水平变形和附加应力及弯矩,最终可能使上部建筑物功能失效。针对该领域目前存在的三维数值法建模复杂及计算耗时的缺点,提出两阶段分析法,该方法首先根据影像源法计算由于基坑开挖地层损失引起的坑外土体位移场,然后基于Winkler地基模型建立基坑开挖与邻近桩基相互作用的弹性地基梁微分方程组,并推导基坑开挖对临近桩基侧向响应影响的数学解析解矩阵表达式。最后结合实例分析表明,该方法计算结果合理可行,能够有效地分析基坑开挖对邻近桩基的影响。
Foundation pit excavation in the building compact district of urban will absolutely induce soil lateral movement, which may generate the additional deflections and bending moments in the adjacent pile shaft, and may lead to their superstructures distress, even failure. To avoid the drawbacks of three-dimensional numerical analysis, such as complexity modeling and time consuming, the two-stage method（TSM） is presented for determining the behavior of adjacent pile caused by foundation pit excavation. Firstly, the additional lateral displacement of soil mass due to adjacent foundation pit excavation is calculated by the virtual image technique. Secondly, the governing differential equations are built up based on Winkler model and their analytical solution of matrix is derived. Finally, analysis of case histories show that the calculated results of analytical solution are reasonable and could be used to analyze the influence of excavation on adjacent pile foundations.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2013年第A01期2746-2750,共5页
Chinese Journal of Rock Mechanics and Engineering
关键词
基坑工程
弹性地基梁
桩-土相互作用
解析解
两阶段分析方法
自由场土体位移
excavation engineering
elastic foundation beam
pile-soil interaction
analytical solution
two-stage analysis method
free-field soil displacement
