淤泥质软土蠕变特性及Singh-Mitchell蠕变模型分析

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Abstract：Muckysiltyclay，characteredbyitshighwatercontentandpoorbearingcapacitycansignificantlyimpactfoudation pitstabilitywhenexposedforextendedperiodswitoutimelysupportduringconstructionToinvestigatetecrepcharacteristicsof muckysiltyclay，thisstudyutilizedundisturbedsoilsamplesfromametrostationfoundationpitinNingbo.Conventionaltriaxial consolidated undrained shear testsandtriaxialconsolidatedundrained shear creep testswereconductedusinganMTSservohydraulicfatiguetestingmachine.TheexperimentalresultswerefitedusingtheSingh-Mitchellcrepmodel.Thetestresults demonstratethatthesoilexhibitssignificantnonlinearcreeefects，withconfiningpressureanddeviatoricstresslevelsplaying crucialrolesincreepbehavior.Asconfiningpressureincreases，deformationduringtheinitialcreepstagebecomesmore pronounced.Under thesameconfining pressre，higher deviatoric stress leads to greater creepdeformation.Underthesame deviatoricstress，thegreatertheconfiningpressure，thesmalerthecreepdeformation.Thefited Singh-Mitchellcreepmodel effectivelydescribstentieceppross，froinitialtosteadtatecreep，validatingtheodelsplicabilityThefidings provideatheoretical basisforlong-termdeformationprediction infoundationpit engineering withinsoftsoilregions.

Keywords：mucky silty clay；triaxial property；creep test；the Singh-Mitchell model

来稿日期：2025-04-25 DOI：10.13937/j.cnki.hbdzdxxb.2025.04.008

基金项目：国家自然科学基金面上项目（52278397）

作者简介：吴波（1971—），男，四川阆中人，博士、教授，主要从事地下空间结构可靠性设计理论与方法研究。（剩余6173字）