SoilQuake.net

Definition of Material Parameters


1) UCSDSAND3BETA

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.
noYieldSurf Number of yield surfaces. The surfaces are generated based on the hyperbolic relation.
cohesi Residual strength at zero confinement.
contrac1 Contraction parameter c1.
contrac2 Contraction parameter c2.
contrac3 Contraction parameter c3.
dilat1 Dilation parameter d1.
dilat2 Dilation parameter d2.
dilat3 Dilation parameter d3.
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.
b1, b2, b3 and b4 Addtional contraction parameters.


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
(N1)60 5 15 25
Relative Density 33% 57% 74%
Density (ton/m3) 1.94 1.99 2.03
refPress (kPa) 101 101 101
refShearModul (MPa) 46.9 73.7 94.6
refBulkModul (MPa) 125.1 196.8 252.6
peakShearStra
0.1
pressDependCoe
0.5
frictionAng (°) 25.4 30.3 35.8
PTAng (°) 20.4 25.3 30.8
contrac1 0.1 0.035 0.015
contrac2 5.0 3.0 1.0
contrac3 0.05 0.20 0.45
dilat1 0.10 0.15 0.20
dilat2 3.0 3.0 3.0
dilat3 0.05 0.20 0.45
liquefac1 1.0 1.0 1.0
liquefac2 0.0 0.0 0.0
noYieldSurf
20
cohesi
1.73 kPa (Equivalent to 2 kPa in simple shear)
b1 0.9 0.5 0.22
b2 30 30 30
b3 0.0 0.0 0.0
b4 0.001 0.001 0.001


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