组合荷载下超大群桩受力变形模型试验研究  

PHYSICAL MODEL ASSESSMENT OF THE DEFORMATION BEHAVIOR OF A SUPER-LARGE PILE GROUP UNDER THE COMBINED LOAD

作　　者：谢涛[1] 蒋泽中[1] 马庭林[2] 袁文忠[1] 

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

出　　处：《工程地质学报》2004年第2期171-176,共6页Journal of Engineering Geology

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 ,应用模型试验分析了在组合荷载作用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。试验结果表明 ,最大弯矩发生在与承台连接附近的桩身处 ,弯矩沿桩身向下随荷载由线性或非线性递减。对于组合加载与水平纵向加载 ,弯矩的极值。A super-large pile group was adopted in the Li-Zigou large-span bridge, one of the major projects on the Nei-Kun railway. A physical model of the super-large pile group is constructed to gain a better understanding of its mechanical behavior by observing the distribution of internal forces and of its deformation behavior under horizontal load. The results show that the maximum bending moment shows up in the vicinage of the cross-connection of the pile and the bearing platform. The bending moment decreases linearly or nonlinearly with the load along the pile from top to bottom. The peak values of the bending moment and its variations differ depending on the combination of vertical and horizontal loads.

关 键 词：李子沟特大桥 铁路桥 模型试验 群桩 组合荷载 

分 类 号：TU473.11[建筑科学—结构工程] U445.55[建筑科学—土工工程]