laboratory investigations extremely high measurements for fine-grained soils细颗粒土壤极高浓度测量实验室研究.pdfVIP

GeotechnicalandGeologicalEngineering(2006)24:565–578Ó2006

DOI10.1007/s10706-005-1147-5

Laboratoryinvestigationsonextremelyhighsuction

measurementsforfine-grainedsoils

VIKASK.S.THAKUR,S.SREEDEEPandDEVENDRAN.SINGHw

DepartmentofCivilEngineering,nInstituteofTechnology,Mumbai,400076,

(Received15June2004;revised4January2005;accepted18January2005)

.ADewpointPotentiaMeter(WP4)wasusedtomeasuresuctionoftwofine-grained

soils:alocallyavailablesiltysoilandcommerciallyavailablewhiteclay,rapidly.Usingthese

results,effortsweremadetocheckthesuitabilityandefficiencyofvariousfittingfunctions,for

definingthesoil–watercharacteristiccurve,SWCC,forhighsuctionranges(0–80MPa).In

additiontothis,aknowledge-baseddatabaseSoilVision3.34wasusedtoestimatetheSWCC

usingPedo-transferfunctions,PTFs.ThestudybringsoutthattheFredlundetal.[1997,

Proceedingsofthe3rdSymposiumonUnsaturatedSoil,RiodeJaneiro,Brazil,pp.13–23]PTF

yieldsthebestestimateofSWCCforfine-grainedsoils.Theinfluenceofthesoiltypeanddry

unitweight,onsuctionandtheSWCCfittingparameters,havealsobeenstudied.

Keywords.DewpointPotentiaMeter,fine-grainedsoils,pedo-transferfunction,soilsuction,

soil–watercharacteristiccurve.

Notations.a:bubblingpressureinkPa;AEV:airentryvalue;a,a:soilparameters

cfvg

whicharedependentontheAEV;h:suctioncorrespondingtow;M:molarityofthe

rr

KClsolution;m:soilparameterwhichisafunctionofw;m:fittingparameter;

frvg

n: