Stiffness Degradation of Soft Marine Clay under Uniaxial Cyclic Loading

摘要

Offshorefoundationsoiloftenexperienceharshwaveload,degradationofmodulusunderwaveloadisanimportantdynamicpropertyforsoilthatsupportsoffshorestructures.Inthisstudy,degradationofmodulusofsoftmarineclayunderuniaxialcyclicloadwasinvestigatedbasedonaseriesofcyclictriaxialtests.Testresultshowthat:whencyclenumberislessthan200,degradationindexdecreaseslinearwiththeincreaseoflogN,andasemi-logarithmicmodelwasproposedtodescribedegradationindexversusnumberofcycle;degradationparameterhaslinearrelationwithnormalizedporepressure;after200ofcycles,degradationindexcometoastablevalue,stabledegradationindexdecreaseswiththeincreaseofnormalizedporepressure,andalinearmodelwasadvancedtoestimatestabledegradationindexbasedonnormalizedporepressure.