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 | |
(N_{1})_{60} | 5 | 15 | 25 |
Relative Density | 33% | 57% | 74% |
Density (ton/m^{3}) | 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 | |
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pressDependCoe | |
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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 | |
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cohesi | |
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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/m^{3}) | 1.3 | 1.5 | 1.8 |
shearModul (kPa) | 1.3x10^{4} | 6.0x10^{4} | 1.5x10^{5} |
poissonRatio | |
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shearStrength (kPa) | 18 | 37 | 75 |
peakShearStra | |