Soil three phases constitution and pore Soil three phases constitution and porosity 质量 体积 空气体积 空气质量=0 孔水体积 水的质量 度 土粒质量 体 积 固体体积
(一)、Soilthree phases constitution and porosity 二. Soil three phases constitution and pore
小孔隙 大孔隙
小孔隙 大孔隙
1, Index three phases constitution Solid phase(%)=(solid volume /soil body volume)X100 Liquid phase (%)=(liquid volume /soil body volume)X100 Gas phase( %)=(air volume /soil body volume)X 100 2、 Soil porosity: Soil porosity is the percentage of the volume of pores to the total volume of soil Soil porosity=1- Solid phase(%) Liquid phase(%0)+ Gas phase (%)
1、 Index three phases constitution Solid phase (%) =（solid volume /soil body volume) ×100 Liquid phase (%) =（liquid volume /soil body volume) ×100 Gas phase (%) =（air volume /soil body volume) ×100 2、Soil porosity: Soil porosity is the percentage of the volume of pores to the total volume of soil. Soil porosity ＝1－ Solid phase (%) = Liquid phase (%) + Gas phase (%)
3、 Void ratio The void ratio is the ratio of the volume of pores to the volume of solids Void ratio=(volume of pores)/(volume of solids ( Calculation of three phases constitution and porosity 1. Solid ratio Solid ratio =(bulk density /density)=Py pp 2. Liquid ratio (volumetric water content Am=(mass of water /mass of dry soil)=Mw/M Av=(volume of water/total volume of soil)=VwVt Vw(Vs+Vx+Va)=0n×pb
The void ratio is the ratio of the volume of pores to the volume of solids. Void ratio = (volume of pores)/(volume of solids) (二)、Calculation of three phases constitution and porosity 1. Solid ratio Solid ratio =（bulk density /density）= ρb / ρp 2. Liquid ratio (volumetric water content) θm = (mass of water /mass of dry soil) = MW/MS θv = (volume of water/ total volume of soil) = Vw/Vt = Vw/(Vs+Vw+Va ) = θm × ρb 3、Void ratio
3. Gas phase ratio Porosity(Po)=1-solid phase ratio=1-bulk density /density Gas phase ratio- porosity- volumetric water content= Po-A 4. Actual volume ratio Solid phase ratio= actual volume ratio- volumetric water content Gas phase ratio=1- actual volume ratio Soil three phases ratio solid phase ratio: volumetric water content: gas phase ratio C). Suitable soil three phases ratio Solid phase ratio is about 50% volumetric water content is 25% to 30% Gas phase ratio is 15% to 25%
3. Gas phase ratio Porosity(P0 ) =1- solid phase ratio =1- bulk density /density） = ρb / ρp Gas phase ratio = porosity- volumetric water content = P0 - θv 4. Actual volume ratio Solid phase ratio ＝ actual volume ratio－ volumetric water content Gas phase ratio = 1－ actual volume ratio Soil three phases ratio ＝ solid phase ratio : volumetric water content : gas phase ratio (三). Suitable soil three phases ratio： Solid phase ratio is about 50%， volumetric water content is 25% to 30%， Gas phase ratio is 15% to 25%