摘要
Tostudythecompactionlawandoverpressureevolutionindeepwatershallowsediments,alarge-straincompactionmodelthatconsidersmaterialnonlinearityandmovingboundaryisformulated.Themodelconsidersthedependenceofpermeabilityandmaterialpropertiesonvoidratio.ThemodifiedCam-Claymodelisselectedastheconstitutiverelationsofthesediments,andthedeactivation/reactivationmethodisusedtocapturethemovingtopsurfaceduringthedepositionprocess.Aone-dimensionalmodelisusedtostudythecompactionlawoftheshallowsediments.Resultsshowthatthesettlementoftheshallowsedimentsislargeundertheirownweightduringcompaction.Thevoidratiodecreasesstrictlywithburialdepthanddecreasesmorequicklyneartheseafloorthaninthedeeperlayers.Thegenerationofabnormalpressureintheshallowflowsandsiscloselyrelatedtothecompactionlawofshallowsediments.Thetwomainfactorsthataffectthegenerationofoverpressureinthesandsaredepositionrateandpermeabilityofoverlyingclaysediments.Overpressureincreaseswithanincreaseindepositionrateandadecreaseinthepermeabilityoftheoverlyingclaysediment.Moreover,anupperlimitfortheoverpressureexists.Atwo-dimensionalmodelisusedtostudythedifferentialcompactionoftheshallowsediments.Theporepressurewillstillincreaseduetotheinflowoftheporefluidfromtheneighboringclaysedimenteventhoughthedepositionprocessisinterrupted.
出版日期
2018年01月11日（中国期刊网平台首次上网日期，不代表论文的发表时间）
