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Determination of Soil Stiffness Parameters

Determination of Soil Stiffness Parameters. Short Course on Computational Geotechnics + Dynamics Boulder, Colorado January 5-8, 2004. Stein Sture Professor of Civil Engineering University of Colorado at Boulder. Determination of Soil Stiffness Parameters. Computational Geotechnics.

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Determination of Soil Stiffness Parameters

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  1. Determination of Soil Stiffness Parameters Short Course on Computational Geotechnics + Dynamics Boulder, Colorado January 5-8, 2004 Stein Sture Professor of Civil Engineering University of Colorado at Boulder

  2. Determination of Soil Stiffness Parameters Computational Geotechnics Contents General concepts and stiffness of sand Hooke’s law E-moduli from triaxial testing E-moduli from oedometer testing Examples on the estimation of E Stiffness of clays Undrained clay behavior Drained clay behavior Examples on the estimation of E

  3. Determination of Soil Stiffness Parameters Computational Geotechnics Idealized and real stress-strain behavior of soils Idealized types of stress-strain behaviors: (a) nonlinear elastic Model, (b) linear elastic model, and (c) elastoplastic model

  4. Determination of Soil Stiffness Parameters Computational Geotechnics Idealized and real stress-strain behavior of soils Various types of elastoplastic behaviors: (a) strain hardening, (b) perfectly plastic, (c) strain softening, and (d) combination of a to c.

  5. Determination of Soil Stiffness Parameters Computational Geotechnics Hooke’s Law of Isotropic Elasticity

  6. Determination of Soil Stiffness Parameters Computational Geotechnics Hooke’s Law of Isotropic Elasticity

  7. Determination of Soil Stiffness Parameters Computational Geotechnics Standard Drained Triaxial Test on Sand

  8. Determination of Soil Stiffness Parameters Computational Geotechnics Standard Drained Triaxial Test on Sand

  9. Determination of Soil Stiffness Parameters Computational Geotechnics Oedometer Test on Sand

  10. Determination of Soil Stiffness Parameters Computational Geotechnics Oedometer Test on Sand

  11. Determination of Soil Stiffness Parameters Computational Geotechnics Oedometer Test on Sand

  12. Determination of Soil Stiffness Parameters Computational Geotechnics Oedometer Test on Sand Loose: Dense: This implies:

  13. Determination of Soil Stiffness Parameters Computational Geotechnics Summary on Stiffness Parameters: Sand (Laboratory based experience) Loose: Loose: Dense: Dense: Unloading: About 4 times stiffer. n small

  14. Determination of Soil Stiffness Parameters Computational Geotechnics Selection of Moduli for FEM-Computation Example 1 (loading): Layer 1 (extremely loose sand Mohr-Coulomb model: Layer 1: Average

  15. Determination of Soil Stiffness Parameters Computational Geotechnics Selection of Moduli for FEM-Computation Example 2 (unloading): Layer 1 (dense): Layer 3 (medium): Unloading: for both layers Mohr-Coulomb model: Layer 1: Layer 3:

  16. Determination of Soil Stiffness Parameters Computational Geotechnics Eoed from Cone Penetration Test in Sands Cone Resistance: Correlation: Literature NC-Sand: a = 1 to 3 Vermeer’s Experience: a = 3 Alternatively:

  17. Determination of Soil Stiffness Parameters Computational Geotechnics Undrained Triaxial Test on Clay Normally consolidated clay: Cu = undrained shear strength (or Su)

  18. Determination of Soil Stiffness Parameters Computational Geotechnics Idealized and real stress-strain behavior of soils

  19. Determination of Soil Stiffness Parameters Computational Geotechnics Idealized and real stress-strain behavior of soils

  20. Determination of Soil Stiffness Parameters Computational Geotechnics Plate Loading Tests Duncan & Buchignani (1976)

  21. Determination of Soil Stiffness Parameters Computational Geotechnics Plate Loading Tests

  22. Determination of Soil Stiffness Parameters Computational Geotechnics Summary on Stiffness Parameters: Clay Undrained Conditions Do not use empirical relationships only. Get good quality experimental data from lab tests, cone penetration tests and vane tests

  23. Determination of Soil Stiffness Parameters Computational Geotechnics Drained Behavior for Clays

  24. Determination of Soil Stiffness Parameters Computational Geotechnics Drained Behavior for Clays

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