资源描述：
《含下卧层复合地基固结的简化分析》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、第36卷第4期同济大学学报(自然科学版)Vol.36No.42008年4月JOURNALOFTONGJIUNIVERSITY(NATURALSCIENCE)Apr.2008含下卧层复合地基固结的简化分析邢皓枫,叶观宝,徐超,苌红涛(同济大学地下建筑与工程系,岩土及地下工程教育部重点实验室,上海200092)摘要:将加固区桩体和桩周土体径向整体作为一个研究对象,从而避开单独考虑因施工造成的涂抹作用的影响.根据单元体排出水量等于体积变化量的关系,用平均超孔隙水压力的概念推导出含下卧层复合地基的固结简化方程.通过改进加固区和下卧层区接触
2、面的边界条件、考虑应力集中效应并结合初始边界条件得到了含下卧层复合地基中超孔隙水压力随时间变化的解析式,提出了反映沉降量大小的整体固结度计算方法.该方法可直接求得不同深度桩体和桩周土的平均超孔隙水压力和平均固结度,也可得到复合地基整体固结度.利用有限元法对解析解进行了对比分析,并通过参数变化的探讨研究了含下卧层复合地基的固结性状的变化规律.关键词:复合地基;超孔隙水压力;固结度;解析解中图分类号:TU43文献标识码:A文章编号:0253-374X(2008)04-0472-05SimplifiedSolutiontoComposi
3、teFoundationwithSubstratumXINGHaofeng,YEGuanbao,XUChao,CHANGHongtao(DepartmentofGeotechnicalEngineering,KeyLabortoryofGeotechnicalandUndergroundEngineeringoftheMinistryofEducation,TongjiUniversity,Shanghai200092,China)Abstract:Withpileanditssurroundingsoilinradialdire
4、ctionstudiedasawhole,theeffectofthecoatingcausedbyconstructionisnotnecessarytobeconsideredindependently.Accordingtotheequiv-alentofseepagedischargetovolumechange,asimplifiedconsolidationformulaofcompositefoundationwithsubstratumisderivedfromtheconceptofaverageexcesspo
5、rewaterpressure.Basedontheim-provedboundaryconditionoftheinterfacebetweenthereinforcedbodyandthesubstratum,andastudyoftheeffectofstressconcentrationandtheinitialandboundaryconditions,theanalyticsolu-tion,whichcanreflecttherelationshipoftheexcessporewaterpressurewithco
6、nsolidationtime,isac-quiredandthedegreeofconsolidationwhichcanreflectsettlementisobtainedaswell.Thismethodcanbeusedtoobtaintheaverageexcessporewaterpressureandaveragepercentconsolidationofthepileanditssurroundingsoil,andtheaveragepercentconsolidationoftheentirecomposi
7、tefoundation.Thefeasibilityofthisanalysissolutionistestifiedbyfiniteelementmethod.Theconsolidationcharac-teristicofcompositefoundationwithsubstratumisstudiedthroughthecalculationandanalysisofdif-ferentparameters.Keywords:compositefoundation;excessporewaterpressure;per
8、centconsolidation;analyticsolution收稿日期:2006-08-17基金项目:国家自然科学基金资助项目(50678130);国家/八六三0高技术研究发展计划资助项目(2007AA11Z117);上海市重点学科建设资助项
