简介：Vacuumloadinghasbeenexaminedasawayofpreparinguniformlyconsolidatedsoftclaysamples.Thefacilityandloadingprocedurearedescribedinthispaper.Ananalyticalsolutiontothethreedimensionalconsolidationequationisderivedforestimatingthedegreeofconsolidationofthesoilsamplewithvacuumloading.Thegivenexampleshowsthatthepredicteddegreeofconsolidationofasoftclaybulkwithvacuumloadingisclosetothatmeasuredintheconsolidationprocess.

简介：Theresultsofundrainedcyclictriaxialtestsonthreetypesofclaysarecollectedandarelationshipamongtheaccumulatedstrain,theinitialstressstate,cyclicstressinthesoil,aswellasthenumberofcyclesisestablishedbasedontheexperimentaldata.Withthisrelationship,aprocedureisproposedforsubsidenceandstabilityanalysisonsoftclayundertheactionofcyclicloads.

简介：Thedegradationstrengthofsoilsundercyclicloadingisstudiedandamethodfordeter-miningthecyclicdegradationstrengthwithcyclictriaxialtestsisgiveninthepaper.Furthermore,adum-mystaticmethodforestimatingtheundrainedbearingcapacityforoffshoresoftfoundationunderwaveloadsisdeveloped.Itcanconsidertheeffectofthedifferenceofcyclicstressfordifferentpartsofthefoun-dationonboththedegradationstrengthofthefoundationsoilandthebearingcapacitysothattheesti-matedresultcanbetterreflecttherealconditionoffoundationundercyclicloading.Themethodcanbeap-pliedtoplaneandspaceproblem.

简介：MuchattentionshouldbepaidtoalargeFPSOmooredpermanentlyinanoilfieldwithwaterdepthofonlyabout20m,sinceshallowwatereffectsonthehydrodynamicsmaybringaboutcollisionanddamage.A160kDWTFPSOwithapermanentsoftyokemooringsystemisinvestigatedwithvariousshallowwaterdepthsandfocusesarethelowfrequencysurgemotionandmooringload.ComputationfortheFPSOsystemismadebasedonlinear3-Dpotentialfluidtheoryandtime-domainnumericalsimulationmethod.CorrespondingmodeltestiscarriedoutintheoceanengineeringbasinofShanghaiJiaoTongUniversity.Itisshownthat,inthesurgenaturalperiod,lowfrequencysurgemotionandmooringforceincreaseremarkablywiththedecreaseofwaterdepth.Especially,thesmallertheratioofwaterdepthanddraughtis,thequickertheincreaseis.Theshallowwatereffectsshouldbetakenintoaccountcarefullyfordeterminingthedesignloadofasinglepointmooringsystem.

简介：软沉积的变丑结构的间隔在在西方的Qaidamu盆的侏罗记湖的存款是暴露得好的。通过地观察，许多软沉积的变丑结构能被识别，例如旋绕的床上用品，液化的沙静脉，负担和火焰结构，商业萧条结构和重叠滑动的结构。基于他们的开始，软沉积的变丑结构能作为三种类型被分类：地震导致的结构，垂直装载结构，并且水平砍结构。基于他们的几何学和开始分析，他们是地震导致结构。根据旋绕的床上用品结构和液化的沙静脉的特征，在中间的侏罗记期间有比在学习区域的大小6大的地震，这能被推断。而且，商业萧条结构的学习和重叠滑动的结构显示在中间的侏罗记期间有一个东南的斜坡。自从到Altyn山和Altyn差错的来自学习区域的距离，是仅仅10km，Altyn山然后存在并且Altyn罢工滑倒差错在中间的侏罗记期间是活跃的，这能也被推断。

简介：ShanghaiislocatedineasternChinaandisbuiltonoverburdensoillayers.ItcanbeseenfromtheMexicoMs=8.1earthquakeonSeptember19,1985andtheHanshinMs=7.4earthquakeonJanuary17,1995thatheavycasualtiesandpropertylosseshaveadirectrelationshipwithoverburdensoillayers.Groundmotionscausedbyearthquakesaresignifieantlyamplifiedwhenpassingthroughthesoillayers.Undertheinfluenceoftheseamplifiedmotions,buildingstructures,whosenaturefrequencyiswithinthefrequencybandofsoilamplificationresponse,willexperiencemoreseveredamagethanthosebuiltonbedrock.Therefore,engineeringseismologistshavepaidconsiderableattentiontheamplificationresponsesintheShanghaioverburdensoillayers.TheamplificationresponsesofsoilandsandlayersinthispaperaregivenbytheML=4.1earthquakeinNantong,JiangsuProvinceonDecember25,2001at31.8°N,120.9°E.Itcanbeseenthattheresponsesofsoilandsandlayersareverydifferent.Thatisimportant.

简介：AccordingtotheChineseGB50011-2001codeandtherecommendedprovisionsofFEMANEHRPandEUROCODE8,byusingshearwavevelocityandboreholedata,thesiteclassificationisevaluatedforatypicalsoftsoilsiteontheYantaiseacoast.Thesiteseismicgroundmotioneffectisanalyzedandtheinfluenceofthecoastalsoilondesigngroundmotionparametersisdiscussed.Theresultsshowthatthebriefsiteclassificationcannotrepresenttherealconditionsofasoftsoilsite;thesoftsoilonthecoasthasaremarkableimpactonthemagnitudeandspectrumofgroundmotionacceleration.Themagnificationonpeakaccelerationisbigger,however,duetothenonlineardeformationofthesoil.Themagnificationisreducednonlinearlywiththeincreaseofinputgroundmotion;thespectrumisbroadenedandthecharacteristicperiodelongatedonthesoftsoilsite.

简介：ExplosionforthetreatmentofunderwatersoftfoundationisatechniquenewlydevelopedinChina.ThispaperdescribestheapplicationofthemethodofexplosiontounderwatersoftfoundationtreatmentoftheGreat-WestDyke,LianyungangPort,includingthetechnicalcharacteristicsandtheeffect,selectionofexplosionparameters,workmanshipofconstruction,requirementsofqualityandinspection,andthelike.

简介：

简介：Stiffnessdegradationwilloccurduetothegenerationofaccumulatedporepressureinsaturatedsoftclaysundercyclicloading.Thesoilstatic-dynamicmulti-purposetriaxialandtorsionalshearapparatusinDalianUniversityofTechnologywasemployedtoperformdifferenttypesoftestonthesaturatedsoftmarineclayintheYangtzeEstuary.Undisturbedsamplesoftheclayweresubjectedtoundrainedcyclicverticalandtorsionalcouplingshearandcyclictorsionalshearafterthree-directionalanisotropicconsolidationwithdifferentinitialconsolidationparameters.Investigatedweretheeffectsoftheinitialorientationangleofthemajorprincipalstress,initialratioofdeviatoricstress,initialcoefficientofintermediateprincipalstressandcontinuousrotationofprincipalstressaxesonthestiffnessdegradation.Itisfoundthatthedegradationindexdecreases(ordegradationdegreeincreases)significantlywithincreasinginitialorientationangleofthemajorprincipalstressandinitialratioofdeviatoricstress.Comparedwiththeeffectsoftheinitialorientationangleofthemajorprincipalstressandinitialratioofdeviatoricstress,theeffectofinitialcoefficientofintermediateprincipalstressislessevidentandthistrendismoreclearlyreflectedbytheresultsofthecyclictorsionalshearteststhanthoseofthecycliccouplingsheartests.Atthesamecyclenumber,thedegradationindexobtainedfromthecyclictorsionalsheartestishigherthanthatfromthecycliccouplingsheartest.Themainreasonisthatthecontinuousrotationinprincipalstressdirectionsduringcycliccouplingsheardamagestheoriginalstructureofthesoilmorethanthecyclictorsionalsheardoes.Basedonaseriesofexperiments,amathematicalmodelforstiffnessdegradationisproposedandtherelevantparametersaredetermined.

简介：Asglobaltemperaturesincreaseanddissolvedoxygen(DO)contentdecreasesinmarinesystems,indicesassessingsedimentDOcontentinbenthichabitatsarebecomingincreasinglyuseful.Onesuchmeasureisthedepthtotheapparentredoxpotentialdiscontinuity(aRPD),atransitionofsedimentcolorthatservesasarelativemeasureofsedimentDOcontent.WeexaminedspatiotemporalvariationofaRPDdepth,andthenatureoftherelationshipsbetweenaRPDdepthandbiotic(infaunaandepibenthicpredators)andabioticvariables(sedimentproperties),aswellastheavailabilityofresources(chlorophyllaconcentration,andorganicmattercontent)intheintertidalmudflatsoftheBayofFundy,Canada.aRPDdepthvariedsignificantlythroughspaceandtime,andacombinationofbiotic(sessileanderrantinfauna,aswellasepibenthicpredators),andabiotic(exposuretimeofaplot,sedimentparticlesize,penetrability,andwatercontent)variables,aswellastheavailabilityofresources(sedimentorganicmattercontent,andchlorophyllaconcentration)werecorrelatedwithaRPDdepth.Assuch,knowledgeofbothbioticandabioticvariablesarerequiredforaholisticunderstandingofsedimentDOconditions.AbioticvariableslikelydictateasuiteofpotentialaRPDdepthconditions,whilebiotaandresourceavailability,viabioturbationandrespiration,stronglyinfluencetheobservedaRPDdepth.AsDOconditionsinmarinesystemswillcontinuetochangeduetoglobalclimatechange,elucidatingtheserelationshipsareakeyfirststepinpredictingtheinfluencedecreasingDOcontentmayhaveuponmarinebenthos.&2017InternationalResearchandTrainingCentreonErosionandSedimentation/theWorldAssociationforSedimentationandErosionResearch.PublishedbyElsevierB.V.Allrightsreserved.