Shear Strength Parameters for Silty-Sand Using Relative Compaction

Electronic journal of geotechnical engineering

Sadanand Ojha²  Ashutosh Trivedi¹ 

[1] Professor, Department of Civil EngineeringDelhi Technological UniversityBawana Road, Delhi-110042, India;Research Scholar, Department of Civil EngineeringFaculty of Technology, University of Delhi (Delhi Technological University Campus)Bawana Road, Delhi-110042, India

关键词: Silty sand;    relative compaction;    relative density;    strength parameters;    critical and peak friction angle.;   

DOI  :  

来源: Oklahoma State University

【 摘 要 】

Thestrengthbehaviorofsiltysandcanbeinterpretedfromitsrelativecompaction,meanconfiningpressureandrelativedilatancy.Thepresentworkconsiderstriaxialtestresultsonsiltysandatdifferentrelativecompactionandconfiningpressure.Thereviewofpastresultsonsheartestingindicatesthatstrengthparameterofcleansandandsiltsareoftenconsideredcorrespondingtorelativedensity.Thereareseriousproblemassociatedwiththeestimationofrelativedensityofthesoilcontainingsignificantpercentageofplasticandnon-plasticsilt.Infact,presenceofplasticfinesdisallowstheinvestigatortointerpretrelativedensity.Thereforeitispertinenttouserelativecompactionofthesoilasconsideredinthepresentstudytointerpretthestrengthparameterofthesoilcontainingfines.Thisconceptisusedforananalyticsimplicityforgenericapplication.Thisrelativedensityassumptionforthesoilcontainingsignificantpercentageoffinesoftenleadstosignificanterrorinoverallestimationofstrengthanddeformationpropertiesofsiltysands.Previousresearchersconsideredthestressstrainresponseofsiltysandbasedoncriticalstatefrictionangle?c,peakfrictionangle?p;maximumandminimumvoidratio(emaxandemin)andempiricalstrengthparametersQbandRb.Theuncertaintyincalculatingtherelativedensityforsiltysandswhenfinecontentsismorethanacertainlimitgiveserrorincomputationofstrengthparametersofsiltysand.Hence,theauthorsinthepresentstudyusedtherelativecompactioninsteadofrelativedensityandobtainedthestrengthparametersQafandRaf.Theresultsarecomparedwiththebackcalculatedvaluesfromthepreviouslypublishedstudies.ItisfoundappropriatetousethestrengthparametersQafandRafforthesoilscontainingsignificantpercentageoffines.ItwasobservedthattheYamunasandcontainingsiltshascomparablevalues(25to40)ofempiricalshearstrengthfittingparameters(Qaf)atselectrelativecompactionasshowninthepresentworkintermsofQafandRaf.ThevalueofQafandRafhasbeenanalysedwithreferencetostandarderrors.

【 授权许可】

Unknown