夯实水泥土桩复合地基承载特性分析  

Bearing Behavior of Compacted Cement-soil Pile Composite Foundation

作　　者：郭忠贤[1,2] 霍达[1] 张明聚[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]石家庄铁道学院土木工程分院,石家庄050043

出　　处：《北京工业大学学报》2009年第8期1045-1053,共9页Journal of Beijing University of Technology

摘　　要：基于夯实水泥土桩复合地基载荷试验的结果,分析了复合地基在竖向荷载作用下垫层、桩及桩间土的共同作用机理,假设桩侧摩阻力分布形状,建立夯实水泥土桩复合地基的分析模型,考虑复合地基中桩、土变形协调,提出了一种计算复合地基桩土应力比的方法.利用该方法对夯实水泥土桩复合地基在竖向荷载作用下的承载特性进行深入研究,重点分析了垫层模量、桩端持力层模量、桩土相对刚度比、桩长径比对桩土应力比的影响.结果表明:夯实水泥土桩复合地基中垫层的模量对桩土应力比的影响要远大于桩端土持力层的模量;桩长径比的增加会使桩土应力比趋于一定值,说明复合地基中临界桩长的存在;增大桩长并同时提高桩土相对刚度比能显著提高桩土应力比.On the basis of filed loading test results of compacted cement-soil pile composite foundation,the cooperation mechanismof piles,surrounding soil and cushionis analyzed under vertical load.Analyzing model is proposed by considering the distribution behavior of skinfriction between the pile andthe surroundings,and the method to calculate the stress ratio of piles to soil isintroduced by considering harmony working of piles,surrounding soil and cushion in composite foundation.The bearing behavior of compacted ...

关 键 词：夯实水泥土桩 复合地基 变形协调 桩土应力比 承载特性 

分 类 号：TU473.1[建筑科学—结构工程]