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时间:2019-03-07
《加筋风砂土地基扩展基础的承压性能》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、第24卷第3期岩石力学与工程学报Vol.24No.32005年2月ChineseJournalofRockMechanicsandEngineeringFeb.,2005加筋风砂土地基扩展基础的承压性能1,22333刘文白,周健,李驰,苏跃宏,刘霖(1.上海海事大学交通运输学院,上海200135;2.同济大学地下建筑与工程系,上海200092;3.内蒙古工业大学建筑工程学院,内蒙古呼和浩特010062)摘要:进行了下压荷载作用下加筋风砂土地基扩展基础的承载试验,研究了土工格栅及风砂土的剪切与拉拔摩擦特性,进行了14种不同加筋条件下的模型试验,加筋后下
2、压承载力高于未加筋承载力的11.0%~453.0%。相同埋深时,长条形闭口箱型和双层土工格栅的承载力较高,加筋后的抗位移性能增强。加筋风砂土的承载力是由土体的压缩和抗剪能力、格栅与土的相互摩擦、格栅对土体的约束作用产生的。建立了加筋风砂土地基扩展基础承受下压荷载的理论计算公式,计算值与实测值基本吻合。提出了加强风砂土承压性能的有效方法为铺设长条形闭口箱型土工格栅和双层土工格栅。关键词:土力学;加筋风砂土;承载力;扩展基础;模型试验中图分类号:TU472文献标识码:A文章编号:1000–6915(2005)03–0537–05PRESSURE-BEAR
3、INGCAPACITYOFSPREADFOUNDATIONWITHREINFORCEDAEOLIANSAND1,22333LIUWen-bai,ZHOUJian,LIChi,SUYue-hong,LIULin(1.CollegeofCommunicationsandTransport,ShanghaiMaritimeUniversity,Shanghai200135,China;2.DepartmentofGeotechnicalEngineering,TongjiUniversity,Shanghai200092,China;3.Collegeof
4、CivilEngineering,InnerMengoliaUniversityofTechnology,Huhhot010062,China)Abstract:Behaviorofspreadfoundationonaeoliansandwithgeo-gridssubjectedtopressureforceisstudiedwithmodeltests.Thepropertiesofdirectshearfrictionandpull-outfrictionactionsarestudied.Fourteentypesofgeo-gridrei
5、nforcedaeoliansandareselectedinthemodelteststoshowthatthepressure-bearingcapacityofgeo-gridreinforcedaeoliansandis11.0%~453.0%higherthanthatoftheunreinforced.Thepressure-bearingcapacitiesofrectangleboxgeo-gridandtwolayersofgeo-gridarehigherthanthosewithothertypesofgeo-gridsfort
6、hesameembedment,andtheanti-displacementpropertyisimproved.Itisshownthatthemechanismofpressure-bearingcapacityisduetothecompressionofsand,shearingresistanceofsand,themutualfrictionalaction,andrestrainactionbetweengeo-gridsandsoils.Theformulaforcalculatingpressure-bearingcapacity
7、ofspreadfoundationswithreinforcedaeoliansandisderivedandthecalculatedresultsagreewellwiththosemeasured.Therectangleboxgeo-gridandtwolayersofgeo-gridareshowntobeeffectivetoreinforcetheaeolianfoundation.Keywords:soilmechanics;reinforcedaeoliansand;pressure-bearingcapacity;spreadf
8、oundation;modeltests收稿日期:2003–08–08;修回日期:2003–10–04基金项
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