简介：Basedonunifiedequivalentharmonicloadingonseabedfoundationandenergyapproachsuggestedbytheauthors,thedevelopmentofdynamicporewaterpressureandstabilityofsoilfoundationforthevibrationofoceangravitystructuresexcitedbyrandomwaveloadingareanalysed.Itmaybeseenthatthepresentmethodforthestudyofdynamicproblemsofoceangravitystructuresoilfoundationsismorereasonableandconvenient.

简介：DuringtheconstructionoftheguidingdikeintheYangtzeEstuary,someofthecaissonstructuressankintothesoilfor1～5morslidabout20mawayfromtheoriginalplacewhenastrongstormattackedthisarea.Dynamictriaxialtestswerecarriedouttosimulatethebehavioroffoundationsoilsunderwaveloading.Thetestresultsshowthattheexcessivesettlementandlateralmovementofthecaissonsareduetotheweakeningofthesoftclaystrengthduringthestrongstorm.Thetestresultsalsoshowthattheabilityofthesoftclaytoresistthewaveforcewillbegreatlyincreasedwhenthesoftsoilsamplesaresuitablyimproved.Basedonthetestresults,animprovementmethodcombiningverticaldrainswithsurchargeloadingwasproposedtostrengthenthefoundationsoil.Ontheimprovedsoilfoundation,thedikehasbeenreconstructedandundergoneseveralstrongstormswithoutanydamage.Afiniteelementapproachhasbeendevelopedforanalyzingthesettlementandstabilityofthedikeundertheactionofstrongstorm.

简介：Wave-inducedtransientresponseofdisplacements,effectivestressesandporepressureinsaturateseabedaresalvedbyaconsolidationfiniteelementmethod.Theinfluenceoftheresponsestothestabilityofseabedandcoastalstructuresisshownbyanimprovedslicemethodwithcirculararcslipsurface.Dynamicelasticconsolidationtheoryandlinearpermeabilitytheoryareemployedinthesolutionofseabedresponse.Theseabedcanbeconsistedoflayeredsoilwitharbitraryboundaries.Theactingwavecanberegularorirregular.Irregularwavepressureactingonthesurfaceofseabediscalculatedbylinearsuperpositionmethod.Wave-inducedexcessstressontheslipsurfaceisconsideredinthestabilityanalysis.Thespatialandtemporalvariationsofporepressureinsandyseabedcomparewellwithexperiment.Calculationsforaverticalbreakwatershowthatthesafetyfactorofseabedandstructurewilldecreaseifwave-inducedseabedresponseisconsidered.Thescopeofdecreaseismainlyre

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

简介：Thelarge-diametercylinderstructure,whichismadeoflargesuccessivebottomlesscylindersplacedonfoundationbedorpartlydrivenintosoil,isarecentlydevelopedretainingstructureinChina.Itcanbeusedinport,coastalandoff-shoreworks.Themethodforstabilityanalysisofthelarge-diametercylinderstructure,especiallyforstabilityanalysisoftheembeddedlarge-diametercylinderstructure,isanimportantissue.Inthispaper,anideaispresentedthatis,em-beddedlarge-diametercylinderquayscanbedividedintotwotypes,i.e.thegravitywalltypeandthecylinderpilewalltype.Amethodforstabilityanalysisofthelarge-diametercylinderquayofthecylinderpilewalltypeisdevelopedandamethodforstabilityanalysisofthelarge-diametercylinderquayofthegravitywalltypeisalsoproposed.Theeffectofsig-nificantparametersonthestabilityofthelarge-dianetercylinderquayofthecylinderpilewalltypeisinvestigatedthroughnumericalcalculation.

简介：作为一个挡土墙，门水注射板桩(PWISP)在2000出现在海岸工程。尽管有许多系统的方法，处理这个问题，在新结构上有在定义在二堆积之间的地压的因为困难的很少的集中。一个新方法在这篇论文被建议获得在PWISP之间的地压。对翻的稳定性分析作为后果列在后面。用FiniteElement分析(FEA)软件ANSYS，两个都，接触元素的土壤和那些的非线性的特征被考虑在接触表面上获得地压分发。基于FEA的结果，Rankin“s理论和slip飞机理论，在堆积之间的内部表面上的地压的公式被给。作为对它起作用的外面的力量作为分析目标和地压假定PWISP，对PWISP翻的稳定性的方程被介绍。最后，一些参数对翻关于PWISP的thest能力被讨论，例如前面堆积，在二排堆积之间的距离，内部磨擦角度和地球的结合的嵌入的深度。结果证明结合和内部磨擦角度的增加将减少距离和嵌入的深度，并且因此对翻提高稳定性。明确地，当距离是最大的挖掘深度的1/3-2/3时，二排堆积在稳定性给最好的表演。

简介：作为一艘轮船的可操作性，近遨游到一个银行被sidewall影响，对调遣稳定性的轮船的评价是重要的。平面运动机制(PMM)测量的水动力学衍生物测试提供一个方法预言轮船可操作性的变化。这份报纸由使用不稳定的RANS方程与变体距离介绍PMM模型测试的数字模拟给一个垂直银行。一种混合动态网孔技术被开发认识到网孔配置并且当轮船接近银行时，动态PMM测试重新协调。建议方法被把数字结果与一条传播的水隧道的PMM测试的结果作比较验证。轮船的一阶的水动力学衍生物从侧面的力量的时间历史被分析并且偏航时刻根据多重跑的模仿过程和有ship-sidewall距离的水动力学衍生物的变化被给。直线稳定性和方向性的稳定性也被讨论并且稳定或不稳定的地区比例衍生物(PD)为方向性的稳定性的控制器参数被显示出，它能是为当航行在一条河岸附近时，保留操作的路线的引用。

简介：Generally,thereliabilityofami-slidingandanti-overturningstabilityofanisolatedgravitycylinderinacertainworkingperiodcanbeevaluatedonlywhenthestatisticalpropertiesofshorttermstabilityaregivenfirst.Theauthorsusednumericalmethodtosimulatethestabilitystatefunctionofacylinderinshort-crestedsea,andfurthertogettheprobabiliticalcharacteristicsofthestructure’sstabilitybytimedomainanalysis.Theexternalloadsappearedinthestatefunctionsincludehorizontalwaveforce,liftforceandtherespectivemoments,andtheloadsarecorrelatedbyco-spectrum.Thenumericalmethodpresentedinthispapercanbeusednotonlytosolveshorttermreliabilityproblemdirectly,buttocalculateandanalysethelongtermreliabilityproblemaswell.Forcircularcylinders,anexampleofsimulationandanalysisisdisplayedinthispaper.

简介：轮船的Ince-Strutt稳定性图表在不规则的波浪的参量的转动回声在不规则的波浪为参量的转动回声的探索被进行并且利用。参量的转动回声将导致的轮船大振幅转动运动甚至失事。第一，在不规则的波浪描述参量的转动回声的方程根据Grims有效理论被导出，相应Ince-Strutt稳定性图表被获得。第二，为在不规则、常规的波浪的参量的转动回声的稳定性图表的差别被比较。第三，波浪阶段和高峰时期被考虑获得一个更现实主义的海条件。当分析的点在不稳定性边界附近被定位时，随机的波浪阶段的影响应该被考虑。为不同波浪高峰时期的稳定性图表是各种各样的。稳定性图表对在设计舞台的参数决心有用更好适应驾驶状况。最后，轮船变量被一条统计途径根据稳定性图表分析。metacentric高度的增加将帮助改进轮船稳定性。

简介：-Thecyclicrotationofprincipalstressdirectionwithaconstantamplitudeisthecharacteristicsofcyclicstressinseabeddepositinducedbytravellingwaves.Presentedinthepaperaretheresultsobtainedfromtestssimulatingthecyclicstresscharacteristics,withemphasislaidonthebuildupofporewaterpressureinsoilsamples.Regressionanalysisoftestdatashowsthattheporewaterpressurecanbeexpressedasthefunctionofthenumberofcyclesofcyclicloading,orasthefunctionofgeneralizedshearstrain.Usingtheresultsthusobtained,thepossibilityoffailureofseabeddepositundercyclicloadinginducedbytravellingwavescanbeevaluated.Thecomparisonwiththeresultsofconventionalcyclictorsionalsheartestsshowsthatneglectoftheeffectofthecyclicrotationoftheprincipalstressdirectionwillresultinconsiderableover-estimationofthestabilityofseabeddeposit.

简介：Inrecentyears,infrastructureconstructiononcoralreefshasbeenincreasinglydeveloped.Therefore,theshallowstratastabilityofcoralreefsintheSouthChinaSeashouldbeevaluated.ThisstudyaimstoinvestigatetheprofilesfortheshallowstrataofcoralreefsinthesouthwestoftheYongshuReef,particularlyinthehydrodynamicmarineenvironment,andtoestablishageologicalmodelfornumericalsimulationusingGeo-Studio.Theshallowstrataofthecoralreefsincludemassgravel,sandgravel,mid-coarsesand,siltysand,finesand,andreeflimestone.Theshallowreefslopenearthelagoonissimilartoa‘layercake＇,inwhichthesideclosetotheseaisanalogoustoa‘blockcake＇.Thesimulationresultsshowedthatcoralreefstabilitydependsonwaveloadsandearthquakestrengthandonthephysicalpropertiesofcoralreefs.Thefactorofsafetyfortheouterreefisgreaterthan10.0understatic,wave,andseismicconditions;thisindicatedthattheouterreefswerelessaffectedbywavesandearthquakes.However,thefactorofsafetynexttothelagoonvariedfrom0.1to5.3.Thevariationwasprimarilycausedbythethickstrataofcoralreefsclosetothesea（reeflimestone,typicallywiththethickness〉10mandequivalenttoablock）.Thesoilandrocklayersinthecoralreefstratawiththicknesses〈10mshowedweakengineeringgeologicalcharacteristics.Ourfindingscanprovideusefulinformationtofutureconstructionprojectsoncoralreefs.