简介：Theresultsofastudyonthekeytechnologyofusingshellsand,akindofseasand,asbackfillforseareclamationaredescribedbriefly.Laboratorytestsshowthatthephysicalandmechanicalpropertiesofshellsandareasgoodasnormalquartzsand.Basedonthechemicaltestanddurabilitytestofshellsanditcouldbeconcludedthattheinfluenceofcorrosionofshellsandbyacidrainandseawatermightbeignoredintheevaluationofthesafetyanddurabilityoftheengineeringproject.Theresultsoffieldimprovementtestsshowthatthebearingcapacityofshellsandbackfillfoundationismorethan200kPaaftervibroflotationimprovementordynamiccompactionimprovement.Theshellsandisagoodbackfillmaterialforseareclamation.

简介：Anumericalmodelfortheself-burialofapipelinetrenchisdeveloped.Morphologicalevolutionsofapipelinetrenchundersteady-currentoroscillatory-flowconditionsaresimulatedwith/withoutapipelineinsidethetrench.Theoscillatoryflowinthisstudyrepresentstheactionofwaves.Thetwo-dimensionalReynolds-averagedcontinuityandNavier-Stokesequationswiththestandardk-εturbulenceclosure,aswellasthesedimenttransportequations,aresolvedwiththefinitedifferencemethodinacurvilinearcoordinatesystem.Bothbedandsuspendedloadsofsedimenttransportareincludedinthemorphologicalmodel.Becauseofthelackofexperimentaldataonthebackfillingofpipelinetrenches,thenumericalmodelisfiretlyverifiedagainstthreeclosely-relevantexperimentsavailableinliterature.Adetailedmeasurementofthechannelmigrationphenomenonundersteadycurrentsisemployedfortheassessmentoftheintegralperformanceofthemodel.ThetwoexperimentalresultsfromU-tubetestsareusedtovalidatethemodel'sabilityinpredictingoscillatoryflows.Differenttime-marchingschemesareemployedforthemorphologicalcomputationunderunidirectionalandoscillatoryconditions.Itisfoundthatvortexmotionswithinthetrenchplayanimportantroleinthetrenchdevelopment.

简介：摘 要 ：水电工程的施工过程中，在部分明渠出口的淘刷区，采用四面体抛填，沿板块施工抗冲桩，此类地形存在抗冲性能差的弊端，为保证桩基成孔的质量，并且确保施工时的安全。结合我公司在此类项目的施工经验，对于在成桩过程中的各项控制要点在本文中进行了总结，为了保证成孔质量，本文陈述了采取超声波成槽检测仪控制孔斜的控制技术，并对孔斜情况进行了监测分析，本文贡献可以为同类工程提供参考。