深基坑桩锚支护结构数值模拟与现场实测  

Numerical Simulation and field monitoring of Pile-anchor Supporting Structure in deep excavation in Chengdu

作　　者：杨庆 钱霄 朱连华[2] 范开全 陈慧娴[2] 

机构地区：[1]四川成都兴蜀勘察基础工程公司,成都610072 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《土工基础》2014年第2期75-79,共5页Soil Engineering and Foundation

摘　　要：利用FLAC3D进行基坑开挖数值模拟,结合桩体钢筋应力与水平位移的现场监测结果,分析了桩锚支护结构桩体受力与变形特征。结果表明:圈梁对桩顶的约束作用明显,在桩顶引起约束横向力与力矩,影响桩体的受力形态;桩身弯矩随着基坑开挖深度的增加而增大,锚杆的位置对桩身弯矩有明显影响;桩身水平位移为两端小中间大,且位移最大值随基坑开挖深度的增加向下发展。The deep excavation receives more and more attentions with the development of the urban construction. This paper presents the numerical analysis using FLAC3D on a deep excavation in Chengdu City. The stress characteristics of ground an chors and soldier piles are studies and compared with the pobserved stress in the rebars and the horizontal displacement. The results indicate that the walers have strong constrains on the deformation of the soldier piles. The constrains induce the shear bending moment at pile head and affect the global stress field in the soldier pile~ The bending moment in pile increases with the excavation depth The location of ground anchors has significant effect on the moment in the pile The maximum deformation a long the soldier pile is at the middle and its location is lowered with the increase excavation depth.

关 键 词：深基坑 桩身弯矩 水平位移 数值模拟 现场监测 

分 类 号：TU443[建筑科学—岩土工程]