群桩基础受力特性的模型试验研究  

Model experimental research on mechanical characteristics of large diameter over-length pile-group foundation in Loess

作　　者：徐亚利[1,2] 刘增荣[1] 

机构地区：[1]西安建筑科技大学土木学院,西安710055 [2]皖西学院城市建设与环境系

出　　处：《工程勘察》2011年第3期6-10,23,共6页Geotechnical Investigation & Surveying

基　　金：陕西省重点实验室基金项目(05JS19)

摘　　要：基于相似理论与模型试验原理,通过相似比例为λ=100的室内模型试验,分别对大直径超长群桩基础的承载—沉降关系、承台下土体附加应力的发展、不同桩位的桩顶反力以及各桩的受力特性进行了研究。结果表明:超长群桩基础的荷载—沉降曲线与该地区单桩沉降曲线相似,也呈缓变型。承台底部土的附加应力呈边缘大、中心小的马鞍型分布。不同桩位的桩顶反力为:角桩最大,边桩和近边桩其次,中心桩最小。不同位置的桩,桩侧阻分布形式各不相同,尤其是桩侧阻最大值出现的位置有所区别。Based on the similarity theory and model test principle,by means of the proportional similarity λ=100 indoor model test,the relation of bearing-settlement of large diameter over-length pile groups foundation,the development of soil additional stress under the pile cap,the counterforce on the pile head and the mechanical characteristics of each pile are studied,respectively.Test results show that the load settlement curve of large diameter over-length pile groups foundation is similar to the single pile in this area,it presents the slowly change type.Soil additional stress under the pile cap presents the shape of saddle that it is bigger on edge than on center.The counterforce on the pile head in different location is that the corner pile is the biggest,the side pile and near side pile takes the second place and that the minimum is the center pile.The piles in different locations have different distribution of the pile side resistance,especially the position that the maximum of the pile side resistance taking place is different.

关 键 词：黄土地基 群桩基础 承载性能 模型试验 

分 类 号：TU473[建筑科学—结构工程]