简介：Chinaisacountryofhighseismicitywithmanyhydropowerresources.Recently,aseriesofhigharchdamshaveeitherbeencompletedorarebeingconstructedinseismicregions,ofwhichmostareconcretedams.Theevaluationofseismicsafetyoftenbecomesacriticalproblemindamdesign.Inthispaper,abriefintroductiontomajorprogressintheresearchonseismicaspectsoflargeconcretedams,conductedmainlyattheInstituteofWaterResourcesandHydropowerResearch(IWHR)duringthepast60years,ispresented.Thedamsite-specificgroundmotioninput,improvedresponseanalysis,dynamicmodeltestverification,fieldexperimentinvestigations,dynamicbehaviorofdamconcrete,andseismicmonitoringandobservationaredescribed.Methodstopreventcollapseofhighconcretedamsundermaximumcredibleearthquakesarediscussed.

简介：微地形学;小地貌是影响分开，运输，和流量的侵蚀过程的高地区域的一个重要表面特征。然而，很少量的信息都不关于在微地形学和沉积产出的表面之间的关系是可得到的。实验室降雨模拟研究被进行为四不同侵蚀决定易受影响的土壤在微地形学和沉积各在0.75h持续时间和60公里h^-1紧张的一系列6～8暴风雨期间产出的表面的变化。选择的土壤是Grenada的Ap材料sil(GlossicFragiudalfs)，Atwoodsil(TypicPaleudalfs)，和Forestdalesicl(TypicOchraqualfs)，以及C材料，Glauconitic沉积，Rustonsil(TypicPaleudalfs)。土壤床与一个像苗床的表面条件在斜槽被准备。在所有前并且在每暴风雨以后，表面微地形学用激光microreliefmeter被决定。微地形学;小地貌，以吝啬的本地地志的坡度，和流量数据表示了在四土壤之中显示一个很类似的模式。沉积集中的开始快速的增加，它快速到达了最大值然后逐渐地减少了到一个近的常数在暴风雨系列的结束珍视的数据表演。沉积产量仔细由于近经常的流量率跟随了沉积集中趋势。微地形学在第一暴风雨期间，但是然后很快改变了的表面减少了对为大多数在顺序的以后的暴风雨的近似经常的价值更渐渐。在沉积yield-microtopography关系中的三个不同阶段被认出：(1)preponding分阶段执行，(2)增加池溏的沉积产量分阶段执行的一根柱子，并且(3)一根柱子减少池溏的沉积收益阶段。这些阶段在粗糙驱散，小河发展，和土壤表面的土壤侵蚀过程的相对重要性反映变化矩阵稳定。

简介：Seismicsafetyassessmentofgravitydamshasbecomeamajorconcerninmanyregionsoftheworldwhiletheeffectsofverticalseismicaccelerationsontheresponseofstructuresremainpoorlyunderstood.Thispaperfirstinvestigatestheeffectofincludingverticalaccelerationsintheslidingresponseanalysisofgravitydamssubjectedtoarangeofhistoricalgroundmotionrecordsseparatedintwogroupsaccordingtotheirsource-to-sitedistance.Analysesshowedthattheincidenceofverticalaccelerationsontheslidingresponseofgravitydamsissignificantlyhigherfornear-sourcerecordsthanforfarsourcerecords.Thepseudo-static30%loadcombinationrule,commonlyusedinpracticetoaccountforthenon-simultaneousoccurrenceofthepeakhorizontalandverticalaccelerations,yieldedgoodapproximationsoftheminimumsafetyfactorsagainstslidingcomputedfromtime-historyanalyses.Amethodforempiricallyestimatingtheverticalresponsespectrabasedonhorizontalspectra,accountingforthedifferenceinfrequencycontentandamplitudesbetweenthetwocomponentsisinvestigated.Resultsfromanalysesusingspectrumcompatiblehorizontalandverticalsyntheticrecordsalsoapproximatedwelltheslidingresponseofagravitydamsubjectedtoseriesofsimultaneoushorizontalandverticalhistoricalearthquakerecords.

简介：这研究的主要目的是通过一系列斜槽模型实验在河床上理解地基的稳定的效果。从结果，尽管检查水坝有能力控制在上游的沉积，搬运，到高出的分泌物的免费秋天生产的集体精力仍然引起强壮的本地人结构下游地搜索，并且这搜索导致检查水坝的不稳定性。因此，这研究在连续地基的各种各样的类型上进行了模型实验决定适当间距最好保护下游的床。基于隧道地形学和沉积的观察和分析，这研究结束了下列结果：1)连续地基完美地减少沉积运输能力，特别在一条温和隧道下面，与24装备的坡度预定平均隧道宽度间隔。要不是陡峭的斜坡，合适的间距应该被弄短到乘平均隧道宽度的12，这被建议。2)地基能有效地保护streambed免受在一个合适的装备条件下面搜索的伤害，指导的概念搜索并且河床惯性在最佳的地基间距的分析被使用。

简介：Theformationoflandslidedamsisofteninducedbyearthquakesinmountainousareas.Thefailureofalandslidedamtypicallyresultsincatastrophicflashfloodsordebrisflowsdownstream.Significantattentionhasbeengiventotheprocessesandmechanismsinvolvedinthefailureofindividuallandslidedams.However,theprocessesleadingtodominofailuresofmultiplelandslidedamsremainunclear.Inthisstudy,experimentaltestswerecarriedouttoinvestigatethedominofailureoflandslidedamsandtheconsequentenlargementofdownstreamdebrisflows.Differentblockageconditionswereconsidered,includingcompleteblockage,partialblockageanderodiblebed(noblockage).Themeanvelocityoftheflowfrontwasestimatedbyvideos.Totalstresstransducers(TSTs)andLaserrangefinders(LRFs)wereemployedtomeasurethetotalstressandthedepthoftheflowfront,respectively.Underacompleteblockagepattern,aportionofthedebrisflowwastrappedinfrontofeachretainedlandslidedambeforethelattercollapsedcompletely.Thiswasaccompaniedbyadramaticdecreaseinthemeanvelocityoftheflowfront.Conversely,underbothpartialblockageanderodiblebedconditions,themeanvelocityoftheflowfrontincreasedgraduallydownwardalongtheslopingchannel.Dominofailuresofthelandslidedamsweretriggeredwhenaseriesofdams(completeblockageandpartialblockage)weredistributedalongtheflume.However,notallofthesedominofailuresledtoenlargeddebrisflows.Themodesofdamfailureshavesignificantimpactsontheenlargementofdebrisflows.Therefore,furtherresearchisnecessarytounderstandthemechanismsofdominofailuresoflandslidedamsandtheireffectsontheenlargementofdebrisflows.

简介：Thispaperappliesthestochasticfiniteelementmethodtoanalysethestatisticsofstressesinearthdamsandassessthesafetyandreliabilityofthedams.Formulationsofthestochasticfiniteelementmethodarebrieflyreviewedandtheprocedureforassessingdam’sstrengthandstabilityisdescribed.Asanexample,adetailedanalysisforanactualdam-Nululindamisperformed.Apracticalmethodforstudyingbuilt-damsbasedontheprototypeobservationdataisdescribed.

简介：Thegrowthincomputerprocessingpowerhasmadeitpossibletousetime-consuminganalysismethodssuchasincrementaldynamicanalysis(IDA)withhigheraccuracyinlesstime.InanIDAstudy,aseriesofearthquakerecordsareappliedtoastructureatsuccessivelyincreasingintensitylevels,whichcausesthestructuretoshiftfromtheelasticstateintotheinelasticstateandfinallyintocollapse.Inthisway,thelimit-statesandcapacityofastructurecanbedetermined.Inthepresentresearch,theIDAofaconcretegravitydamconsideringanonlinearconcretebehavior,andslidingplaneswithinthedambodyandatthedam-foundationinterface,isperformed.Theinfluenceofthefrictionangleandliftjointslopeontheresponseparametersareinvestigatedandthevariouslimit-statesofthedamarerecognized.Itisobservedthatbyintroducingaliftjoint,thetensiledamagecanbeavoidedforthedamstructure.Theliftjointslidingisessentiallyindependentofthebasejointfrictionangleandtheupperligamentovertheinclinedliftjointslidesintotheupstreamdirectioninstrongearthquakes.

简介：Inthispaper,basedonthreedifferentkindsofceramicsidedamsforthinstripantinuouscasting,thefrictionandwearingpropertywerestudied.Theeffectsoffrictionpressure,temperatureandfrictiontimeonthefrictionandwearingpropertyoftheceramicsidedamwereresearched.What’smore,thefrictionmechanismandwearingmechanismoftheceramicsidedamwereresearchedaswell.ResultsshowthattheceramicsidedamofBN-SiAlONhasthebestwearingresistanceproperty.whileatroomtemperature,16minoffrictiontimeand0.35MPaoffrictionpressure,thetestfrictioncoefficientis0.60andwearingcapacityis272.358mm~3.Inaddition,whenat400℃,16minoffrictiontimeand0.18MPaoffrictionpressure,thetestfrictioncoefficientis0.70.Thefrictionmechanismofceramicsidedamwiththeoppositewearingmaterialismainlythecompositewearofadhesion,abrasiveandfatigue.

简介：BasedonthenaturalandsocialconditionsaswellashydrogeologicalcharacteristicsoftheRyukyulimestone,amajoraquiferintheRyukyuIslands,aconceptionofundergrounddam,wasproposedintheearly1970sinordertodevelopgroundwaterresourcesintheQuatemaryRyukyulimestoneregionsofJapan.Thepracticeofnearlythirtyyearshasshownthattheundergrounddamisanenvironment-friendlyandeffectivewayfordevelopinggroundwaterintheseregions.``Tofurtherimprovethetechnologyassociatedwithundergrounddam,theauthorsintroducedrelatedanalyticmethods.Theapplicationofthegeographicalinformationsystemtechnologytositeselectionoftheundergrounddamisreportedinthispaper.``

简介：水库的存储能力逐渐地由于在能力(ASC)弄弯的区域存储引起变化的沉积累积被减少。建立这些曲线并且预言他们的未来变化是为水坝的规划者，设计者和操作员的一个重要问题。许多实验、半实验的途径为为这些曲线建立并且预言未来变化被建议了。在这研究，四个实验、半实验的方法被评估，他们中的三个被修改由于沉积在ASC曲线被用于变化的预言，基于为在USA的11座水库的存在沉积调查数据。为评估，这些途径被考察并且过去常决定沉积深度并且建立ASC为Mosul水坝水库(MDR)弯，它是在北伊拉克的河底格里斯河上的最大的水力的结构。MDR开始与11.11的一个存储能力在1986操作?km3和水出现区域380?在正常操作舞台的km2(330?ma.s.l)。从这些方法获得的结果用在25年水坝的操作以后在2011被收集了的观察深测术的调查数据被评估。评估结果证明三个方法为关于1.06-3.30%与百分比错误在水坝地点估计水深度或沉积深度介绍了更精确的结果。虽然为建立ASC弯，一个方法与调查数据介绍了好协议结果。而且，在为时期的MDR的水坝地点的ASC和沉积深度50，75，100和125年用修改途径和区域减小方法被估计。当与区域减小相比方法由开垦的美国局求婚了，协议及时随增加变得更好时，修改方法的结果提供了合理同意时期。

简介：【摘要】梅钢1780轧线L1与L2之间采用DAMS平台进行通讯，由于产品拓展，产量、质量的进一步提升，以及L2仿真系统平台的搭建，DAMS通讯平台的负荷进一步增大，造成L1-L2之间出现通讯中断，电文丢失的情况。本文根据现场实际情况及DAMS特性，给出了一种用以解决上述问题的方法。

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