土壤力学土壤力学英文 (5).ppt

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1、Physical States of SoilThe behavior of a soil depends not only on the properties of individual constituents of the soil mass,but also on those properties that are due to arrangement of the particles in the soil mass.For example,loose sand can be transformed into a dense state by vibration.Coarse-gra

2、ined soilFine-grained soilRelative density,Dr=50%of the soil greater than 0.075mm ConsistencyLooseness or densenessHard,stiff,plastic,soft=50%of the soil finer than 0.075mm Relative densityThe term relative density is commonly used to indicate the in situ denseness or looseness of coarse-grained soi

3、l.It is defined ase=in situ void ratio of the soilemax=void ratio of the soil in the loosest stateemin=void ratio of the soil in the densest stateDescription of coarse-grained soilsRelative density(%)Description of soil0-15Very loose15-50Loose50-70Medium70-85Dense85-100Very denseConsistencyIt refers

4、 to the degree of adhesion between the soil particles and to the resistance against forces that tend to deform or rupture the soil aggregate.Physical states of fined-grained soilVolumeWater content(w)SolidSemi-solidPlasticLiquidSLPLLLDCBAPlasticity index,PIThe range of water contents over which the soil deforms plastically is known as the plasticity index,PILiquidity index,LIThe liquidity index gives a qualitative measure of strength.Activity,AActivity is used as an index for identifying the swelling potential of fine-grained soils.