不同垫层型式沉箱基础的水平振动特性研究（英文）-豆柴文库

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不同垫层型式沉箱基础的水平振动特性研究（英文）
AStudyontheHorizontalVibrationCharacteristicsofCofferdamFoundationswithDifferentCushionLayers
Introduction:
Cofferdamsaretemporarystructuresconstructedinwatertoenabletheformationofadryarea,whichcanthenbeusedforconstructionpurposes.Thesestructuresaretypicallyconstructedwhenconstructionofstructuressuchasdams,bridges,orbuildingsinvolvestheuseofwater.Cofferdamsareusuallymadeupofsteelsheetpilesortimberandaredesignedtoresistthehydrostaticpressureofthewater.Cofferdamfoundationsplayavitalroleinensuringthestabilityofthecofferdamduringitsservicelife.
Cofferdamfoundationsaresubjectedtovariousdynamicloadsduringtheirservicelife.Onesignificantdynamicloadisthehorizontalvibrationcausedbythesurroundingwaterandpassingtraffic.Toensurethestabilityofthecofferdam,itisimportanttostudythehorizontalvibrationcharacteristicsofthecofferdamfoundationwithdifferentcushionlayers.
CushionLayer:
Thecushionlayerisreferredtoasalayerofdeformablematerialplacedbetweenthecofferdamfoundationandthesoil.Theprimaryfunctionofthecushionlayeristoreducetheimpactofdynamicloadscausedbypassingtraffic,waterwaves,andotherloadsonthefoundation.Thecushionlayertypicallyconsistsofmaterialssuchasrubber,foam,oracombinationofboth.Thethicknessandmodulusofthecushionlayercansignificantlyaffectthehorizontalvibrationcharacteristicsofthecofferdamfoundation.
ExperimentalDesign:
Tostudythehorizontalvibrationcharacteristicsofthecofferdamfoundationwithdifferentcushionlayers,aseriesofexperimentswereconductedusinga1/10scalemodelcofferdamfoundationinalargewatertank.Thecofferdamfoundationconsistedofsteelsheetpileswithalengthof30cm,aheightof20cm,andathicknessof0.5cm.Threetypesofcushionlayerswereusedintheexperiments:rubber,foam,andacombinationofrubberandfoam.Thethicknessofthecushionlayerwasvariedbetween5mm,10mm,and20mm.
Tosimulatethepassingtrafficload,anexcitationforcewasappliedtothecofferdamfoundationmodelusingasinusoidalvibrationexciter.Theexcitationfrequencywasvariedbetween1Hzand10Hz,andtheamplitudewasvariedbetween