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1、?Themechanicalbehaviorofanunsaturatedsoilisdirectlyaffectedbychangesinthepore-airandpore-waterpressures.Undrainedloadingofanunsaturatedsoilgeneratesporepressuresinboththeairandwaterphases.?Thischapterpresentsthepore-pressuresgeneratedasaresultoftheapplicationoftotalstressestoth
2、esoil.?Thecompressibilityofair,water,andair-watermixturesispresentedalongwiththecompressibilityofthesoilstructurewhichissummarizedintheformofaconstitutiverelationship.?Theporepressureresponseisexpressedintermsofporepressureparameters,whichrelatethedevelopmentofpore-pressurestoa
3、changeintotalpressureappliedtoasoilmass.Theseparametersperformausefulroleinvisualizingunsaturatedsoilbehavior.?Estimatedporepressuresarerequiredatthestartofatransientconsolidationtypeanalysis.?Comparisonsbetweenthepredictionsandmeasurementsofporepressuresgeneratedbyappliedloads
4、arepresentedanddiscussed.?Thischapteraddressesporepressuresgeneratedundervariousloadingconditions.Additionalnotes:1?Duringundrainedcompressionofanunsaturatedsoil,volumechangeoccursasaresultofthecompressionofairandtoalesserextent,compressionofthewater.Consequently,thepore-airand
5、pore-waterpressuresincrease.?Soilsolidscanbeconsideredtobeincompressibleforthestressrangescommonlyencounteredinengineeringpractice.?Thecompressibilityofamaterialatapointcanbedefinedonthevolume-pressurecurveduringcompression.?Isothermalcompressibilityisdefinedasthevolumechangeof
6、afixedmasswithrespecttoapressurechangeperunitvolumeataconstanttemperature.Additionalnotes:2?Isothermalcompressibilityofairisdefinedasthevolumechangeofafixedmassofairasthepressureischanged.?Thevolumeversuspressurerelationshipforairduringisothermal,undrainedcompressioncanbeexpres
7、sedusingBoyle’slaw,andthefinalairvolume,Va,isafunctionoftheappliedabsoluteairpressure,ua?Differentiatingthevolumeofair,Va,withrespecttotheabsoluteairpressure,definesanexpressionfortheinfinitesimalvolumechangeofairwithrespecttoaninfinitesimalchangeintheabsoluteairpressure.?Combi
8、ningthisequationwithBoyle’slawpermitsexpressingthevolu
