软土路堤柔性桩复合地基工作机理研究  

Study on Working Mechanism of Flexible-pile Composite Foundation in Soft Base Areas

作　　者：陈刚[1,2] 洪宝宁[1,2] 徐奋强[3] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学土木与交通学院,江苏南京210098 [3]南京工程学院建筑工程学院,江苏南京211167

出　　处：《水利与建筑工程学报》2013年第6期45-49,共5页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金资助项目(51079052);中央高校基本科研业务费专项资金资助项目(2012B03014);广东省交通运输厅科技项目(2013-02-003)

摘　　要：在分析柔性路堤下桩土受力性状的基础之上,利用有限元分析软件Plaxis建立复合地基数值模型,对柔性桩复合地基中不同的垫层模量及厚度的选取进行了模拟,重点研究了桩土及垫层的受力特性。分析结果表明:当其他指标相同时,在相同均布荷载下,垫层模量对关键指标的影响不大;随着垫层厚度的增加,垫层最大沉降及桩顶刺入量均逐渐减小并稳定在某一区间以内;桩顶应力及桩土应力比逐渐增大,并有逐渐稳定趋势。研究成果可为软土路堤柔性桩复合地基的设计工作提供有益参考。Based on the analysis of flexible embankment＇ s pile-soil stress traits, the numerical simulation model for dif- ferent cushion modulus and thickness were built by the finite element analysis software Plaxis to study the stress character- istics of pile soil and cushion. The results show that when the other indicators are the same, and under the same dis- tributed load, the cushion modulus has a little effect on key indicators; with the increase of cushion thickness, the largest displacement and penetration of the cushion are gradually decreased and stabilized in a certain range; the pile-top stress and pile-soil stress ratio is gradually increased and has the signs of gradual stabilization. The research results can provide a valuable reference for the design of the flexible-pile foundation in soft base areas.

关 键 词：软基 桩土受力性状 柔性桩 数值分析 

分 类 号：TU470[建筑科学—结构工程]