Units and Symbols - Unsaturated Soil Mechanics in Engineering Practice - page 862

Table A.4 ( Continued )

Description Symbol Unit

B ah

Pore-air pressure parameter (secant) —

Pore-air pressure parameter (tangent) B a —

Pore-water pressure u w kPa

B wh

Pore-water pressure parameter (secant) —

Pore-water pressure parameter (tangent) B w —

Porosity n %

Porosity with respect to water phase n w %

Porosity with respect to air phase n a %

Preconsolidation pressure σ p kPa

ε r

Radial strain %

MJ/m 2 /day

Radiation, net R n

Radiation, short wave R c mm/day

MJ/m 2 /day Radiation, total solar R a

Radius of capillary tube r m

Ratio of specific gas constants δ —

Relative air hydraulic conductivity k ra —

Relative humidity, RH h r %

Relative water hydraulic conductivity k wr —

Salt content s g/kg

Saturated (water) hydraulic conductivity k s m/s

u air
v 0

Saturated water vapor pressure kPa

Shear strains γ xy , γ yz , γ zx degrees

Shear strength fitting parameter κ —

Shear stress τ kPa

Shrinkage curve curvature c sh —

Shrinkage curve minimum void ratio a sh —

Shrinkage curve slope b sh —

Soil compression index C c —

Soil pore shape parameter η —

Soil suction ψ kPa

Soil suction at residual conditions ψ r kPa

ψ d

Soil suction on drying curve kPa

ψ w

Soil suction on wetting curve kPa

Swelling index C s —

Specific heat capacity C s kJ/kg K

Specific gravity of solids G s —

Specific volume v 0

Specific volume of air v a0

Strain longitudinal in x- direction ε x %

Strain longitudinal in y- direction ε y %

Strain longitudinal in z- direction ε z %

T s

Surface tension of water mN/m

Swelling pressure P s kPa

P s

Swelling pressure, corrected kPa

SWCC a f fitting parameter (Fredlund and Xing) a f kPa