长短桩复合地基桩土应力比的力学计算方法  

Dynamical Calculation Method of Pile-soil Stress Ratio of Long-short-pile Composite Foundation

作　　者：郭院成[1] 李明宇[2] 

机构地区：[1]郑州大学土木工程学院,河南郑州450002 [2]同济大学地下建筑工程系,上海200092

出　　处：《公路交通科技》2009年第2期37-41,共5页Journal of Highway and Transportation Research and Development

基　　金：河南省科技攻关项目资助(0424450011)

摘　　要：通过分析柔性基础下长短桩复合地基中桩顶褥垫层内受力分布,建立了力学模型,理论推导了柔性基础下刚性长短桩复合地基桩土应力比的解析公式。并通过柔性基础下长短桩4桩现场静载荷试验测得的桩土应力比结果对公式进行了对比验证。结果表明本文所提出的桩土应力比理论计算公式具有较好的工程实用性。得出柔性基础下长短桩复合地基桩土应力比与上部荷载和褥垫层厚度成正比,同桩径成反比的研究结论。By analyzing stress distribution in cushion at top of pile of long-short-pile composite foundation under flexible base, the mechanical model was established and the analytical formula of pile-soil stress ratio of rigid longshort-pile composite foundation under flexible base was derived. Result of the pile-soil stress ratio from mechanical calculation method and the result from the field four-pile static loading test of long-short-pile composite foundation under flexible base were compared. The result of comparative analysis shows that （ 1 ） the formulation is practical; （2） the pile-soil stress ratio is directly proportional to loads and cushion thickness and inversely proportional to pile diameter.

关 键 词：道路工程 桩土应力比 力学分析 长短桩复合地基 

分 类 号：U412.222[交通运输工程—道路与铁道工程]