土壤力学土壤力学英文 (3).ppt

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1、Mineral Composition of SoilsMineral Composition of SoilMineralsOrganic componentsOriginal minerals,such as quartz,feldspar,mica,etc.Secondary minerals,mainly clay minerals,such as kaolinite,illite and montmorillonite.Solid particlesStructure of kaolinite,illite and montmorilloniteSilica sheetAluminu

2、m sheetPotassium,K+(gap)Hydrogen bondsKaoliniteIlliteMontmorilloniteH2O or exchangeable cationsKaoliniteIlliteDiffuse double layerSurface area of clay mineralsSpecific surface area As:the total surface area of soil per unit weight.KaoliniteIlliteMontmorilloniteAs=1020 m2/gAs=65100 m2/gAs=50800 m2/gThe claywater interaction coupled with the large surface areas results in clays having larger water-holding capacity in a large number of smaller pore spaces.