长桩对复合地基特性的影响数值分析  

Numerical analysis of the long pile on the composite foundation

作　　者：翟晓力[1] 葛忻声[2] 

机构地区：[1]山西水利职业技术学院,山西太原030027 [2]太原理工大学,山西太原030024

出　　处：《四川建筑科学研究》2013年第2期195-200,共6页Sichuan Building Science

基　　金：国家自然科学基金资助项目(50678110)

摘　　要：利用有限元分析软件ANSYS建立长短桩复合地基模型,分析了长桩桩体模量与桩长变化对长短桩复合地基中长桩与短桩中角桩、边桩和中桩的沉降和应力特性的影响,为复合地基长桩桩体模量与桩长选择提供了依据,有利于复合地基的优化设计。分析结果表明:在长短桩复合地基中,长桩桩身应力最大应力点在桩顶下的某一深度处,在这个深度以上,桩身应力沿深度逐渐增大,在这个深度以下,桩身应力逐渐减小。短桩桩身最大应力点出现在桩顶处,桩身应力从桩顶沿深度减小。随着长桩桩体模量和桩长的增加,长桩、短桩的沉降也相应减小。长桩各桩体的应力随之增加,短桩各桩体的应力变化规律不规则。This paper uses the finite element analysis software ANSYS to build the long-short-pile composite foundation model.The research in this paper discusses the settlement of pile and stress characteristic influence of the corner pile,side pile and center pile about the modulus and the length of long pile variation of long-short-pile composite foundation,and provide a theoretical evidence for a suitable selection of the modulus and the length of long pile and an optimal design for the composite foundations.The analysis results show that：The stress of long pile has an important feature along the changes of the depth.It is that the point of maximum stress is not on the top of long pile,but in a certain depth under it,the stress of pile gradually increased along the depth upon this depth while decrease below it.The maximum stress points are on the top of short pile,and the stress decreases along the depth from the pile top.As the modulus and the length of long pile increases,the settlement of long pile and short pile decrease,but the rate of decrease is getting smaller and smaller.The stress of the long pile gets greater and greater,the change rule of the stress of short pile is irregular.

关 键 词：长短桩复合地基 有限元法 沉降 应力 

分 类 号：TU47[建筑科学—结构工程]