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1、第35卷第10期岩土力学Vol.35No.102014年10月RockandSoilMechanicsOct.2014文章编号:1000-7598(2014)10-2787-07底部抽真空预压法砂井地基固结解析解1,2341,2张福海,陈雷,郭帅杰,任朋勋(1.河海大学岩土力学与堤坝工程教育部重点实验室,南京210098;2.河海大学岩土工程科学研究所,南京210098;3.交通运输部天津水运工程科学研究院,天津300456;4.铁道第三勘察设计院集团有限公司,天津300251)摘要:基于谢康和等应变条件砂井地基固结理论和Hansbo砂井固结理论,考虑底
2、部抽真空预压法加固方法中真空作用面位于固结土层底部的实际边界条件,推导出忽略竖向渗流情况下的底部真空预压加固地基固结方程解析解答。根据超孔压固结方程形成过程以及其解析解表达式,分析其与一般负压径向固结解答的区别。通过室内模型试验实测数据与解析模型计算结果的对比表明,不同位置处孔压和固结度计算值与实测结果吻合较好,从而验证了该模型的合理性,同时运用该模型也可有效验证已有关于底部抽真空室内模拟及现场原位试验结果。底部抽真空轴对称固结解析解可为底部抽真空技术的实际工程应用提供基础性的理论支持,推动底部抽真空技术的大规模推广应用。关键词:砂井地基;真空预压;解析
3、解;模型试验;固结度中图分类号:TU472.3+3文献标识码:AAnalyticalsolutionforconsolidationofsand-drainedfoundationwithbottomvacuumpreloadingmethod1,2341,2ZHANGFu-hai,CHENLei,GUOShuai-jie,RENPeng-xun(1.KeyLaboratoryofMinistryofEducationforGeomechanicsandEmbankmentEngineering,HohaiUniversity,Nanjing210098
4、,China;2.InstituteofGeotechnicalEngineering,HohaiUniversity,Nanjing210098,China;3.TianjinResearchInsitituteforWaterTransportEngineering,M.O.T.,Tianjin300456,China;4.TheThirdRailwaySurveyandDesignInstituteGroupCorporation,Tianjin300251,China)Abstract:Accordingtotheequalstrainaxisy
5、mmetricconsolidationtheoryofsand-drainedfoundationdevelopedbyXieandHansbo,analyticalsolutionstotheaxisymmetricconsolidationequationwithbottomvacuumpreloadingarederivedinthisstudyastheverticalwaterflowinsoilisneglectedfortheactualloadingboundaryconditionthatthevacuumpreloadingloca
6、tesatthebottom.Basedontheanalyticalsolutionformationprocessofexcessiveporepressureaxisymmetricconsolidationcontrolequation,acomparisonbetweenthisnewdevelopedmodelandthecurrentsolutioniscarriedoutgradually.Incomparisonofthenewmodeloutputsandtheexperimentalresultsbylaboratorytest,t
7、heexcessiveporepressuredistributioninverticaldirectionandtheconsolidationratiodevelopmenttrendsforexcessiveporepressuredissipationcanbeobtainedbythenewdevelopedanalyticalmodel,anditalsocanbeconcludedthatthecalculatedresultsshowagoodagreementtothelaboratoryandsiteexperimentalresul
8、ts.Therefore,theanalyticalsolutioncanbef