简介：Experimentsshowthatsiltsandsiltysoilsexhibitcontractionfollowedbydilationduringshearingandtheslopeoffailurelinedecreasesatlargestrains,termedasphasetransformationbehaviour.Thispaperistodevelopanewmicromechanicalstress-strainmodelthataccountsforthephasetransformationbehaviourbyexplicitlyemployingthephasetransformationlineanditsrelatedfrictionangles.Theoverallstrainincludesplasticslidingandplasticcompressionamonggrains.Theinternal-frictionangleatthephasetransformationstateandthevoidstatevariableareemployedtodescribethephasetransformationbehaviour.ThemodelisexaminedbysimulatingundrainedanddrainedtriaxialcompressiontestsperformedonPiteasilts.Thelocalstress-strainbehaviourforcontactplanesisalsoinvestigated.更多还原

简介：Comparativestudyontheactivityandkinecticpropertiesofacidphosphatase(ACPase)ofthreesoilsamendedwithHgandCuatconstanttemperatureandhumiditywascarriedout.TheresultsindicatedthattheinhibitiononACPaseofthethreesamplesoilsbyHgandCuvariedwiththecontentofsoilorganicmatterandpH,where,Soil1wasthemostseriouslycontami-natedduetoitslowestcontentoforganicmatterandthelowestpHamongthreesamples,Soil2tookthesecondplace,andSoil3wastheleastcontaminated.ExceptSoil3,theactivityofsoilACPasetendedtoincreasealongwiththecontacttimeunderthesametypeandthesameconcentrationofheavymetal.InparticulartheVmaxvaluesofACPaseinallthreesamplesdecreasedwithincreasingHgandCuconcentration,whereastheKmvalueswereaffectedweakly.AccordingtothechangeofVmaxandKmvalues,CuandHghadthesameinhibitioneffectonsoilACPase.Bothofthemmaybeatypeofcompoundofnon-competitiveandanti-competitiveinhibition.StatisticanalysesindicatedthatactivitiesofsoilACPaseandVmaxvaluescouldserveasbioindicatortopartiallydenotetheheavymetalHgandCucontaminationdegree.

简介：Astheoffshoreindustriesmovefromshallowtodeepwatersinexcessof1000m,therehasbeenrapiddevelopmentofoceanengineeringpractices.Innovationsintheoreticalandappliedmechanicshavebeenessentialinthisshiftandinunderpinningtheexploitationofoffshoreoilandgasandrenewableenergyresourcesworldwide.Understandingandpredictingphysicalmechanismsofstructure-soilinteractionsarevitalforthestabilityandsafetyofoffshoreengineeringstructures.Accordingly,inthisspecialissueofTheoretical&AppliedMechanicsLetters(TAML),eight

简介：Thisletterpresentsanewanalyticalapproximationforwave(current)-induceddynamicsoilresponseinmarinesediments.Inthemodel,thethird-orderapproximationforwave-currentinteractionsisemployedfortheflowmodel,whileBiot’sdynamicporo-elasticmodelisusedtosimulatetheporousflowinaseabed.Thenewlyanalyticalsolutionisvalidatedwiththefieldobservations.Basedonthesolution,effectsofcurrentsandwave-nonlinearityonsoilresponseareexaminedandaparametricstudywillbecarriedouttoexaminetheinfluenceofcurrentsontheliquefactionpotential.

简介：电子温度和电子数字密度是在血浆的描述的重要参数。在电子温度和土壤血浆的电子数字密度由激光产生了的这份报纸，脱离在不同分泌物电压与毫微秒分泌物火花结合了被学习了。Saha-Boltzmann阴谋并且空拓宽被用来决定温度和电子数字密度。本地热平衡在毫微秒火花被完成，这被证明提高的血浆。提高的光排放，到噪音比率的信号和以在不同火花电压的信号紧张的相对标准差的稳定性详细被调查。一个相对稳定的分泌物过程在带的试验性的配置下面与10kV分泌物电压的使用被观察。

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简介：Theadsorptioncapabilityofloamsoilfornano-TiO2affectedbytheamountandintensityofleachedwaterhasbeeninvestigatedbysimulatingthenaturalrainfallprocessundertheleachingcondition.Theresultsshowthattheamountandtheintensityofleachedwateraretwoimportantfactorsaffectingtheadsorptioncapabilityofloamsoilfornano-TiO2.Theresultsindicatethatthedepthoftheloamsoilcontainingamaximalamountofnano-TiO2isproportionaltotheamountofleachedwater,whileitisinverselyproportionaltotheintensityofleachedwater,ataconstantamountoftheleachedwater.Itwasalsofoundthattheadsorptioncapabilityofsoilsfornano-TiO2canbeimprovedbyaddingothermaterials,suchasdissolvedorganicmatter(DOM),bentoniteandstraw.ItwasfoundthatDOMisthebestsorbentforimprovingtheadsorptioncapabilityofloamsoilfornano-TiO2,followedbybentonite,whilestrawisnotsuitableforthemodificationofloamsoil.Theimprovementofadsorptioncapabilityofloamsoildependsontheamountoftheseadditives.Nano-TiO2canbeeffectivelyadsorbedonthesurfacelayerofloamsoilcontaininganappropriateamountofadditive.

简介：Inthisstudy,avariationalapproachtothesettlementanalysisofanaxiallyloadedpierem-beddedinamulti-layeredsoilprofileispresented.Inthismethod,thesoilprofileandtheembeddedpieraredividedintoanumberofsub-layersaccordingtotheactualnumberofsoillayersobservedinthefield.ThedisplacementshapefunctionofeachsoillayerisgivenasaproductofanexponentialequationalongthepierdepthandtheBessel’ssolutionintheradialdirection.Thedisplacementrelationshipamongthelayerscanbederivedthroughthetransformationmatrices.Oneofthemajorfeaturesofthismethodisthatthetotalnumberofpierelementsisthesameasthatofsoilsub-layers.Allthefieldcompontents,suchasthedisplacement,stress,andstraininthesoil,canbecalculatedbyclosed-formsolutionsexceptthattheonlyunknownvari-ableisthevalueβwhichcanbedeterminedbyiterationtechniques.Comparisonsweremadewiththeresultsoffiniteelementanalysisandthefieldobservationinpile-loadedtests.

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简介：Basedonconsolidationequationsproposedforunsaturatedsoil,ananalyticalsolutionfor1Dconsolidationofanunsaturatedsingle-layersoilwithnonhomogeneousmixedboundaryconditionisdeveloped.Themixedboundaryconditioncanbeusedforspecialapplications,suchastestsoccurinlaboratory.Theanalyticalsolutionisobtainedbyassumingallmaterialparametersremainconstantduringconsolidation.Inthederivationoftheanalyticalsolution,thenonhomogeneousboundaryconditionisfirsttransformedintoahomogeneousboundarycondition.Then,theeigenfunctionandeigenvaluearederivedaccordingtotheconsolidationequationsandthenewboundarycondition.Finally,usingthemethodofundeterminedcoefficientsandtheorthogonalrelationoftheeigenfunction,theanalyticalsolutionforthenewboundaryconditionisobtained.Thepresentmethodisapplicabletovarioustypesofboundaryconditions.Severalnumericalexamplesareprovidedtoinvestigatetheconsolidationbehaviorofanunsaturatedsingle-layersoilwithmixedboundarycondition.

简介：Atwodimensionalplane-stressfinite-elementtypeofanalysisispre-sentedtopredictthebehaviourofgeogridsembeddedinsandunderpulloutloadingconditions.Intheanalysistheinteractionsbetweensoilandgeogridaresimulatedbynon-linearsprings.Thestiffnessesofthespringscanbedeterminedfromsimpletestsinaspeciallydesignedpulloutbox.Theproposedfiniteelement(FE)analysisisappliedtointerprettestresultsfromalargescalepullouttestrig.Thepredictedbe-haviourofthegeogridunderpulloutloadagreeswellwiththeobserveddataincludingtheload-displacementproperties,thedisplacementdistributionalongthelongitudinaldirectionandthemobilisationofthefrictionalandbearingresistance.

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简介：Inthispaper,withK+,Ca2+andFe3+astheobjectsofstudy,retardationofsoil–bentonite(SB)barriermaterialsformetalionswithdifferentvalencesisinvestigated,andtheadsorptionmechanism,migrationpatternsandpermeationbehaviorareexploredsoastoprovideatheoreticalbasisfortheirapplication.TheresultsshowthattheadsorptionprocessformetalionswithdifferentvalencesbySBbarriermaterialsisfast,andthehigherthevalence,thegreatertheadsorptioncapacity.Thefttingoftheadsorptionprocessconformstopseudo-second-orderadsorptionkineticsandLangmuir–Freundlichadsorptionequation,whichexplainsthatchemicaladsorptionisthedominatingstateandthattheSBsurfacehascertainheterogeneity.ThepermeabilitycoeffcientofK+,Ca2+andFe3+inSBeachhasamaximumandthehigherthevalence,thesoonerthemaximumappears.Alsothehigherthevalence,themoreobvioustheeffectonSBretardationperformance;andthesoonertheionbreaksthroughthebarrierwallcompletely,thatis,thewall’sretardationperformanceforhighervalentionsmaydecline.

简介：土壤结构接口的行为在土壤结构相互作用的定义起一个主要作用。在这糊双性人潜力表面为土壤结构接口的elasto塑料的模型被建议以便描述接口变丑行为，包括紧张弄软和正常膨胀性。模型在概括潜在的理论，土壤结构接口问题作为压力地里的一个二维的数学问题在是问候的框架被提出，并且塑料州的方程被用来代替传统的域表面。关系曲线砍应力和正切的紧张被明智的功能由夸张功能和夸张正割功能填写了的一片适合，当关系正常弯时，紧张和正切的紧张被明智的功能由二次的功能和夸张正割功能填写了的另一片适合。建议的途径有的优点导出elastoplastic没有要求的组成的矩阵塑料潜在的功能和收益表面。而且，数学原则是清楚的，并且全部模型参数能被试验性的测试识别。最后，模型的预言与获得从的试验性的结果相比简单砍在正常压力下面的测试，和结果证明模型讲理、实际。

简介：Aschemeisdevelopedforanalysingtheinteractionbetweenafoundationandanonlin-earrockandsoilmedium,inwhichthefoundationisconsideredasalinearelasticbodyandatypicalboundaryintegralequationmethod(BIEM)isemployed.(hathebasisoftakingthenonlinearproper-tiesofthemediumintoaccount,aperturbationBIEMisdeveloped.Thefundamentalequationsforthenonlinearcouplinganalysisareformulated,andtypicalproblemsaresolvedanddiscussedbythepre-sentmethod.

简介：从地下的管子的漏能导致被破坏并且引起损坏到邻近的基础结构的基础。包围漏的区域的土壤粒子能从由漏的液体的土壤矩阵被动员，代替，并且甚至洗了，产生虚空或洞。用acoupled的二维的模拟分离元素方法和格子Boltzmann方法(DEMLBM)被用来调查一个土壤床题目的行为到局部地注射的液体，它在一根管子中代表一条漏缝。内部粒子的表面精力的各种各样的价值也被采用为连贯的粒子的机械效果建模。结果建议内部粒子的表面精力极大地关于漏的液体影响床反应，包括开始洞，洞形状和它的进化率的过量压力。

简介：Duetothewideapplicationsofarchesinundergroundprotectivestructures,dynamicanalysisofcircu-lararchesincludingsoil-structureinteractionsisimportant.Inthispaper,anexactsolutionoftheforcedvibrationofcirculararchessubjectedtosubsurfacedenotationforcesisobtained.Thedynamicsoil-structureinteractionisconsideredwiththeintroductionofaninterfacialdampingbetweenthestructureelementandthesurroundingsoilintotheequationofmotion.Byneglectingtheinfluencesofshear,rotaryinertiaandtangentialforcesandassumingthearchincompressible,theequationsofmotionoftheburiedarchesweresetup.Analyticalsolutionsofthedynamicresponsesoftheprotectivearcheswerededucedbymeansofmodalsuperposition.Archeswithdifferentopeningangles,acousticimpedancesandrise-spanratioswereanalyzedtodiscusstheirinfluencesonanarch.Thetheoreticalanalysissuggestsblastloadsforelasticdesignsandpredictsthepotentialfailuremodesforburiedprotectivearches.

简介：Aninvestigationismadeonthesoilpressureinaninecabinopenedbottomellipticalbarrelstructure.Thecalculationmodelsusingthepenetrationofnegativepressuremethodhavebeendeveloped.Thefirstcalculationmodelisisfortheconstructionstageinvolvingthreezones,namely,passive,transitional,andactiveestablishedforthesoilpressureincabins.Theothercalculationmodelisbasedontheusestage,withthetwo(passiveandactive)zonesforthesoilpressureincabins.Theheightofzonesandthetheoreticalanalyticalsolutionsofinnersoilpressurearederived.Theanalyticalformulasofthemodelsareprovedusingthefiniteelementmethodandexperimentaldata,andtheformulasareanalyzedintheinnersoilpressureinthesamecondition.Thecalculationmodelscanbeusedforothermulti-positionstructuraldesignorconstruction.

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