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1D Soil Compression Behavior and Three Generalized Soil Models - Coggle…
1D Soil Compression Behavior and Three Generalized Soil Models
1D Compression Framework
Normal Consolidation Linie
e-Log Sigma,V relation
Overconsolidation Ratio (OCR) and Preconsolidation Pressure
Model 1: MIT-E3 (Clays)
Cross-anisotropy due to 1D loading
Ladd & Varallyay 1965
Kinematic hardening
evolving yield surface orientation
Paraleastic stiffness functions (nonlinear)
Hueckel & Nova 1979
Bounding surface plasticity
Dafalias & Herrmann 1982
Model 2: MIT-S1 (Sands)
State parameter -> governs dilatancy
Loading Collapse Curve (LCC) defines limit compression
Particle breakage = Main compression mechanism
Common framework for sands & clays; nonlinear CSL
simplifies calibration relative to CSL-based models -> robust calibration via LCC
Model 3: MIT-SR (Viscoplastic Clays)
Internal state variable Ra for microstructural perturbation
Bridges Hypothesis A and B
A = Size-Independent
B = Size-dependent
Rate-dependent creep & secondary compression
Yield Surface Geometry
Ellipsoidal (E3) vs. Lemniscate (S1) shapes
Orientation - stress history & particle fabric
Critical Concepts
Critical State Linie (CSL) parallel to NCL
Fabric anisotropy -> directional yielding
Creep & microstructure influence long-term settlement