Definition of Material Parameters

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1) UCSDSAND3

For a detailed explanation on the parameters below, please click here.

VARIABLES	DESCRIPTION
Density	Saturated soil mass density.
refShearModul	Reference low-strain shear modulus, specified at a reference mean effective confining pressure.
refBulkModul	Reference bulk modulus, specified at a reference mean effective confining pressure.
frictionAng	Friction angle at peak shear strength.
peakShearStra	Shear strain at which the maximum shear strength is reached, specified at a reference mean effective confining pressure.
refPress	Reference mean effective confining pressure.
pressDependCoe	A positive constant defining variations of shear and bulk modulus as a function of instantaneous effective confinement.
PTAng	Phase transformation angle.
mType	0: Triaxial Compression; 1: Triaxial Extension; 2: Direct Shear.
ca	Contraction parameter ca.
cb	Contraction parameter cb.
cc	Contraction parameter cc.
cd	Contraction parameter cd.
ce	Contraction parameter ce.
da	Dilation parameter da.
db	Dilation parameter db.
dc	Dilation parameter dc.
noYieldSurf	Number of yield surfaces. The surfaces are generated based on the hyperbolic relation.
liquefac1	Damage parameter to define accumulated permanent shear strain as a function of dilation history.
liquefac2	Damage parameter to define biased accumulation of permanent shear strain as a function of load reversal history.
pAtm	Atmosphere pressure.
cohesi	Residual strength at zero confinement.

SUGGESTED PARAMETER VALUES:

For user convenience, a table is provided below as a quick reference for selecting parameter values. However, use of this table should be of great caution, and other information should be incorporated wherever possible.

	Loose	Medium Dense	Dense	Very Dense
(N1)60	5	15	25	35
Relative Density	33%	57%	74%	87%
Density (ton/m3)	1.94	1.99	2.03	2.06
refPress (kPa)	101
refShearModul (MPa)	46.9	73.7	94.6	111.9
refBulkModul (MPa)	125.1	196.8	252.6	298.3
peakShearStra	0.1
pressDependCoe	0.5
frictionAng (°)	25.4	30.3	35.8	42.2
PTAng (°)	20.4	25.3	30.8	37.2
mType	0
ca	0.03	0.012	0.005	0.001
cb	5.0	3.0	1.0	0.0
cc	0.2	0.4	0.6	0.8
cd	16.0	9.0	4.2	2.2
ce	2.0	0.0	-1.0	0.0
da	0.15	0.3	0.45	0.6
db	3.0	3.0	3.0	3.0
dc	-0.2	-0.3	-0.4	-0.5
noYieldSurf	20
liquefac1	1.0
liquefac2	0.0
pAtm	101.3 kPa
cohesi	1.73 kPa (Equivalent to 2 kPa in simple shear)

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2) UCSDCLAY

VARIABLES	DESCRIPTION
Density	Saturated soil mass density.
shearModul	Low-strain shear modulus.
poissonRatio	Poisson's ratio.
shearStrength	Shear strength.
peakShearStra	The shear strain at which the shear strength shearStrength is reached.
noYieldSurf	Number of yield surfaces.

SUGGESTED PARAMETER VALUES:

For user convenience, a table is provided below as a quick reference for selecting parameter values. However, use of this table should be of great caution, and other information should be incorporated wherever possible.

	Soft Clay	Medium Clay	Stiff Clay
Density (ton/m3)	1.3	1.5	1.8
shearModul (kPa)	1.3x104	6.0x104	1.5x105
poissonRatio	0.4
shearStrength (kPa)	18	37	75
peakShearStra	0.1