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时间:2020-03-27
《圆形浅基础极限承载力分析.pdf》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30卷第12期公路交通科技v01.30No.122013年12月JournalofHighwayandTransportationResearchandDevelopmentDec.2013doi:10.3969/j.issn.1002—0268.2013.12.006圆形浅基础极限承载力分析李海青1,宋伟2,魏迸3,李粉玲4(1.内蒙古大学交通学院,内蒙古呼和浩特010020;2.陕西省交通建设集团公司,陕西西安710075;3.长安大学公路学院,陕西西安710064;4.西安市地下铁道有限责任公司,陕西西安710018)摘要:针对圆形浅
2、基础地基承载力,采用极限分析法上限定理推导出圆形浅基础的承载力公式。公式推导过程中,考虑土体重力做的功,假定地基破坏模式服从普朗特尔滑动机构,滑动机构包括ABC、ADE刚体和ACD对数螺旋变形体3部分,并分别得到内能耗散率、重力功的功率、上覆土层能量消散率及外力的总功率,通过研究土体发生无限制塑性流动时的外部功率与内能耗散率求解出极限承载力。计算结果与地基承载力实测资料对比分析表明:计算结果较参考文献计算值总体偏大,与实测值的误差控制在20%范围内,可为计算圆形浅基础地基承载力提供参考.关键词:道路工程;地基;极限分析法;极限承载力;上限定理
3、;重力中图分类号:U416.101;TU471+.1文献标识码:A文章编号:1002—0268(2013)12—0035—04AnalysisofUltimateBearingCapacityofShallowCircularFoundationLIHai.qin91,SONGWei2,WEIJin3,LIFen.1in94(1.SchoolofTransportation,InnerMongoliaUniversity,HohhotInnerMongolia010020,China;2.ShaanxiProvincialCommunicat
4、ionsConstructionGroup,Xi’anShaanxi710075,China;3.SchoolofHighway,Chang’anUniversity,Xi’anShaanxi710064,China;4.Xi’anUndergroundRailwayCo.,Ltd.,Xi’anShaanxi710018,China)Abstract:Focusingonthebearingcapacityofcircularshallowfoundation,theformulaforthebearingcapacityofshallowc
5、ircularfoundationisderivedbyusingtheupperboundtheoremoflimitanalysismethod.Intheprocessofderivingformula,consideringtheworkofsoilweight,assumingthatfoundationfailuremodeobeysPrandleslidingmechanismwhichconsistsofABC,ADErigidbodyandACDlogarithmicspiraldeformable—body,theinte
6、rnalenergydissipationrate,gravitypower,energydissipationrateofoverlayingsoilandthetotalpoweroftheforceareobtainedrespectively.Byresearchingtheexternalpowerandinternalenergydissipationratewhenthesoilisunrestrictedplasticflowing,thesolutionofultimatebearingcapacityissolvedout
7、.Thecomparativeanalysisofthecalculationresultandmeasureddataofthebasebearingcapacityindicatethatthecalculationresultsinthispaperarehigherthanthoseofreference,andtheerrorbetweenthemeasuredvalueandcalculatedvalueisintherangeof20%.Theanalyticalsolutionscanbeusedforcalculationo
8、fbearingcapacityofcircularshallowfoundation.Keywords:roadengineering;base;limitana
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