摘要
基于Winkler弹性地基梁理论,考虑支护桩与支撑结构的变形协调,将支撑结构视为弹簧杆件,并将地基反力函数分段.应用分段独立坐标法推导并建立了桩体挠度微分方程,采用数值方法求解支护桩变形量.以贵阳地铁2号线兴筑西路站深基坑工程为背景,计算分析了不同开挖深度时桩体水平位移.结果表明:分段函数的计算值与实测值较吻合,地基反力函数分布形式对桩体变形影响较大,当深度分布指数n取0.7时,计算值更接近实测结果;桩身刚度对支护桩的变形影响显著.
The space curve differential equations for retaining pile within each independent coordinates system were proposed by applying the Winkler elastic foundation beam theory. And the deformation compatibility condition between retaining piles and retained structures was considered, the retained structures were regarded as spring element, and the ground reaction force was set as segmented function in the equations. Then, the deformations of retaining piles by this numerical method were solved. And taking the deep excavation project of Guiyang Metro Line 2 Xingzhu Western road station as a background, the lateral displacement of retaining piles was analyzed at different excavation depths. The results show that the calculated values of piecewise functions are close to the site monitoring data;the functions of ground reaction force had a great influence on retaining piles deformation, and when the depth index is 0.7, the calculated values are closer to the site monitoring data. The pile stiffness affects the retaining piles deformation obviously.
作者
李涛
邵文
郑力蜚
张荣辉
LI Tao;SHAO Wen;ZHENG Lifei;ZHANG Ronghui(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2019年第3期511-519,共9页
Journal of China University of Mining & Technology
基金
国家自然科学基金青年科学基金项目(51508556)
中央高校基本科研业务费专项资金项目(2011QL02)
关键词
岩-土复合地层
深基坑
弹性地基梁
变形计算
现场实测
soil-stone composite
deep foundation
elastic foundation beam
deformation calculation
field monitoring
