摘要
为了研究黄土深基坑在开挖进程的地表变形和支护结构水平位移变化规律,对咸阳地区某深基坑变形进行了监测,并运用有限元软件plaxis进行了分析计算.现场实测结果与计算结果吻合较好.在此基础上,分析了采用锚拉排桩支护的黄土深基坑在逐步开挖过程中支护结构的水平变形及地表变形规律.结果表明:随基坑逐步开挖及锚杆逐层施加,支护桩桩身水平位移增长趋势由线性变为非线性,水平位移最大点逐渐下移,曲线渐变近似呈"弓形";地表土体水平位移、竖向位移及影响范围均随开挖深度的增大而增大,与竖向位移相比,水平位移值大,影响半径大,沿地表衰减速度慢.
Field investigations as well as numerical analysis by using FEM Plaxis for a deep pit locatea in Xian-yang district were conducted to reveal the principle of displacements of deep pit in loess during the process of excavation. The results show that the site monitoring results are consistent with the calculating results;the horizontal displacement of retaining piles and ground surface as well as ground settlement all increase with the excavation depth;the horizontal displacement of retaining piles increases linearly to nonlinearly and the section of maximum displacement descends, in addition, the infulence distance becomes bigger than ground settlement.
出处
《西安工业大学学报》
CAS
2009年第6期579-584,共6页
Journal of Xi’an Technological University
基金
陕西省教育厅自然基金项目(09JK482)
陕西省教育厅自然基金项目(08JK332)
关键词
黄土深基坑
数值分析
锚拉排桩
地表土体
变形特征
deep pit in loess area
numerical analysis
retaining piles
ground surface
deformation characteristics
