水平承载下超大群桩受力变形特性的模型试验研究  

MODEL TESTING STUDY ON DEFORMATION BEHAVIOR OF SUPER-LARGE PILE GROUP UNDER HORIZONTAL LOAD

作　　者：谢涛[1] 袁文忠[1] 马庭林[2] 蒋泽中[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都61003131 [2]铁道第二勘察设计院桥隧处,四川成都610031

出　　处：《岩石力学与工程学报》2005年第9期1582-1587,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：铁道部科技研究计划开发项目(98G17)

摘　　要：李子沟特大桥是内昆线上的重点工程,采用了超大群桩基础。为了进一步完善对超大群桩基础的力学行为的认识,运用模型试验分析了在水平承载下超大群桩基础的内力分布特点、群桩的承载性状和受力变形特性,得出了在不同荷载水平作用下,桩身各截面弯矩和水平位移等关系曲线和数据。试验结果表明,桩体上部受荷载的影响最为显著,最大弯矩发生在与承台连接附近的桩身处,弯矩沿桩身向下呈非线性递减,沿荷载作用方向桩前后土体的力学行为是不同的。Lizigou large-span bridge which adopts super-large pile group is one of the main projects on the Neijiang-Kunming railway. A model for super-large pile group is developed to study the mechanical action, the distribution feature of internal force and deformation behavior of pile group under horizontal load. Through the model test, some dependence and magnitude of cross section bending moment of piles and horizontal displacement are obtained under different load levels. It is shown that the upper part of pile is affected significantly by the load, the maximum bending moment occurs in the vicinage of cross-connecting of pile and bearing platform, and the value of maximum bending is decreased progressively alone the pile from top to bottom. The mechanical action of the front and rear earth of pile group is different alone the direction of load.

关 键 词：土力学 李子沟特大桥 模型试验 群桩 水平荷载 

分 类 号：TU473.1[建筑科学—结构工程]