Numerical Simulation of Mechanical Compaction of Deepwater Shallow Sediments-中国Betway体育网页登陆

摘要 Tostudythecompactionlawandoverpressureevolutionindeepwatershallowsediments,alarge-straincompactionmodelthatconsidersmaterialnonlinearityandmovingboundaryisformulated.Themodelconsidersthedependenceofpermeabilityandmaterialpropertiesonvoidratio.ThemodifiedCam-Claymodelisselectedastheconstitutiverelationsofthesediments,andthedeactivation/reactivationmethodisusedtocapturethemovingtopsurfaceduringthedepositionprocess.Aone-dimensionalmodelisusedtostudythecompactionlawoftheshallowsediments.Resultsshowthatthesettlementoftheshallowsedimentsislargeundertheirownweightduringcompaction.Thevoidratiodecreasesstrictlywithburialdepthanddecreasesmorequicklyneartheseafloorthaninthedeeperlayers.Thegenerationofabnormalpressureintheshallowflowsandsiscloselyrelatedtothecompactionlawofshallowsediments.Thetwomainfactorsthataffectthegenerationofoverpressureinthesandsaredepositionrateandpermeabilityofoverlyingclaysediments.Overpressureincreaseswithanincreaseindepositionrateandadecreaseinthepermeabilityoftheoverlyingclaysediment.Moreover,anupperlimitfortheoverpressureexists.Atwo-dimensionalmodelisusedtostudythedifferentialcompactionoftheshallowsediments.Theporepressurewillstillincreaseduetotheinflowoftheporefluidfromtheneighboringclaysedimenteventhoughthedepositionprocessisinterrupted.

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Numerical Simulation of Mechanical Compaction of Deepwater Shallow Sediments

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