支盘桩工作性状的模型试验研究  

Model test study of working characteristics for piles with branches and discs

作　　者：李天宝[1] 卢成原[1] 王科元[1] 

机构地区：[1]浙江工业大学建筑工程学院

出　　处：《浙江工业大学学报》2008年第3期290-294,304,共6页Journal of Zhejiang University of Technology

基　　金：浙江省自然科学基金资助项目(502117)

摘　　要：根据挤扩支盘桩的实际工作性状,设计了一个室内模型试验装置来研究支盘桩的承载和变形性能以及影响因素,通过与等直径模型桩的对比试验表明支盘桩的承载力远远高于等直径桩,而沉降变形则要小得多.试验还证实盘底土体的侧阻对桩的承载力贡献很小,在紧邻盘底的位置甚至可能产生负摩擦作用,设计时应给予充分重视.另外盘间距的大小对桩荷载的传递和各盘承载力的发挥也有较大影响,建议多支盘桩的盘间距应在3倍盘径以上.A model test setup was designed to investigate bearing and deformation characteristics and other influence factors of piles with branches and discs based on its actual working effect. In contrast to the equivalent-diameter model pile, it showed that the loading ability of the pile with branches and discs was much higher than that of the equivalent-diameter ones, and its settlement was much lower. The test also proved that lateral friction of soil body beneath the discs did little contribution to the loading ability of the piles. On the contrary, there will be a negative friction close to the bottom of discs. We should pay a great attention to this phenomenon.

关 键 词：支盘桩 模型试验 承载和变形性能 荷载传递机理 

分 类 号：TU473.1[建筑科学—结构工程]