ASTM D5780-1995(2002) 静态轴向压缩加载下永冻层中各个叠层的标准试验方法

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【英文标准名称】:StandardTestMethodforIndividualPilesinPermafrostUnderStaticAxialCompressiveLoad
【原文标准名称】:静态轴向压缩加载下永冻层中各个叠层的标准试验方法
【标准号】:ASTMD5780-1995(2002)
【标准状态】:现行
【国别】:
【发布日期】:1995
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D18.19
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:桩;压缩试验;蠕变;静荷载;土壤;深基单元;置换率;基础单元;冻土;永冻层中的各个叠层;永冻层;静态轴向压缩加载;垂直层;试验;轴向荷载;失效时间
【英文主题词】:axialload;compressiveload;displacementrate;frozen;permafrost;piles;soil;staticload
【摘要】:Thistestmethodwillprovidearelationshipbetweentimetofailure,creeprate,anddisplacementtofailureforspecificfailureloadsatspecifictesttemperaturesaswellasarelationshipbetweencreeprateandappliedloadatspecifictesttemperaturesforloadslessthanfailureloads.Piledesignforspecificsoiltemperaturesmaybecontrolledbyeitherlimitinglong-termstresstobelowlong-termstrengthorbylimitingallowablesettlementoverthedesignlifeofthestructure.Itisthepurposeofthistestmethodtoprovidethebasicinformationfromwhichthelimitingstrengthorlong-termsettlementmaybeevaluatedbygeotechnicalengineers.Dataderivedfrompiletestsatspecificgroundtemperaturesthatdifferfromthedesigntemperaturesmustbecorrectedtothedesigntemperaturebytheuseofdatafromadditionalpiletests,laboratorysoilstrengthtests,orpublishedcorrelations,ifapplicable,toprovideasuitablemeansofcorrection.Fordrivenpilesorgroutedpiles,failurewilloccuratthepile/soilinterface.Forslurriedpiles,failurecanoccurateitherthepile/slurryinterfaceortheslurry/soilinterface,dependingonthestrengthanddeformationpropertiesoftheslurrymaterialandtheadfreezebondstrength.Locationofthefailuresurfacemustbetakenintoaccountinthedesignofthetestprogramandintheinterpretationofthetestresults.Dynamicloadsmustbeevaluatedseparately.1.1Thistestmethodcoversproceduresfortestingindividualverticalpilestodetermineresponseofthepiletostaticcompressiveloadappliedaxiallytothepile.Thistestmethodisapplicabletoalldeepfoundationunitsinpermafrostthatfunctioninamannersimilartopilesregardlessoftheirmethodofinstallation.Thistestmethodisdividedintothefollowingsections:SectionReferencedDocuments2Terminology3SignificanceandUse4InstallationofTestPiles5ApparatusforApplyingLoads6ApparatusforMeasuringMovements7SafetyRequirements8LoadingProcedures9StandardTestProcedures10ProceduresforMeasuringPileMovements11Report12PrecisionandBias13Keywords14