The Soft Soil model is suitable for simulation of normally consolidated or near normally consolidated clay soils. The Soft Soil model has the nonlinear elastic characteristic which has the logarithmically relationship between volumetric strain and mean effective pressure. This is the same stress-dependent stiffness with Modified Cam-Clay.
Following is the summary of parameters for the Soft Soil model.
|
Parameter
|
Description
|
Reference value (kN, m)
|
|
Soil stiffness and failure
|
|
λ
|
Compression index
|
Cc / 2.303
|
|
κ
|
Swelling index
|
Cs / 2.303
(Cc / 5 for a rough estimation)
|
|
c
|
Cohesion
|
Failure parameter as in MC model
|
|
φ
|
Friction angle
|
Failure parameter as in MC model
|
|
ψ
|
Dilatancy angle
|
0
|
|
Advanced parameters (Recommend to use Reference value)
|
|
KNC
|
Ko for normal consolidation
|
1-sinφ (< 1)
|
|
Cap yield surface
|
|
OCR / Pc
|
Over Consolidation Ratio /
Pre-overburden pressure
|
When entering both parameters,
Pc has the priority of usage
|
|
α
|
Cap Shape Factor (scale factor of preconsolidation stress)
|
from KNC (Auto)
|
