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1、Cyclicanddynamicmechanicalbehaviourofgranularsoils:experimentalevidenceandconstitutivemodellingClaudiodiPrisco*-ClaraZambelli**MilanUniversityofTechnology(PolitecnicodiMilano)DepartmentofStructuralEngineeringP.zaL.daVinci,3220133,Milan,Italyclaudio.dip
2、risco@polimi.itzambelli@stru.polimi.itABSTRACT:Themechanicalbehaviourofgranularsoilsundertransientloadingconditionsisquitecomplexbecauseofthenumberoffactorsinfluencingit.Inthispresentation,tomakeorderinthelargenumberofexperimentalobservationsandtheoret
3、icalapproachesintroducedinthelastdecades,asystematicapproachhasbeenchosen.Abasicdescriptionofstandardlaboratoryexperimentaldevicesconceivedtodescribethecyclicanddynamicmechanicalbehaviourofsoilswillbefirstlyreported.Themainfeaturesofthemechanicalrespon
4、se,indrainedandundrainedconditions,ofgranularsoilsaredescribedandcriticallycompared.Finally,withintheframeworkofelasticityandelasto-plasticitytheories,abriefdiscussionaboutsomeconstitutivemodellingaspectsisintroduced.KEYWORDS:cyclicanddynamicmechanical
5、behaviour,constitutivemodelling,experimentaltests,sand,densification,liquefactionRFGC.–7/2003.GeodynamicsandCyclingModelling,pages881to910882RFGC.–7/2003.GeodynamicsandCyclingModelling1.IntroductionTheanalysisandtheunderstandingofthemechanicalbehaviour
6、ofsoilscyclicallyand/ordynamicallyloadedcanbeconsidereduptillnowamongthemoststimulatingsubjectsofsoilmechanics,inparticular,whenlargestrainsaswellasalargespectrumoffrequenciesaretakenintoconsiderationandtheproblemofthecouplingbetweenvolumetricandsheari
7、rreversiblestrainsisanalysed.Usually,thissubjectisstudiedbystartingfromtwooppositepointsofview.Thecyclicmechanicalbehaviourishighlightedbymeansofsophisticatedconstitutivemodelscapableofreproducingthevolumetric-deviatoriccouplingandtheirreversibilityoft
8、heconstitutiverelationship,andbydisregardingatallthetimefactor.Onthecontrary,thedynamicmechanicalresponseistackledbymeansofelasto-viscousapproachesthatarelinearandallowustosolveboundaryvalueproblemsinthefrequencydomain.Solelyinthelastde
