Location

St. Louis, Missouri

Session Start Date

3-11-1991

Session End Date

3-15-1991

Abstract

The soil parameters that are commonly of interest in dealing with earthquake and soil dynamics problems are:

1) The maximum shear modulus G0, or the shear wave velocity, Vs.

2) The variation of secant shear modulus with shear strain level, G/G0 vs γ.

3) Equivalent viscous damping as a function of strain.

4) Other parameters such as, dilatometer modulus, normalized SPT or CPT value, state parameters, formation factor.

In terms of constitutive relations the following models have been used:

1) Linear elastic (total stress) - appropriate at very small strains < 10-3%.

2) Equivalent linear elastic with equivalent viscous damping to account for hysteretic damping (total stress). Where pore pressure rise and liquefaction is of concern, this approach is used to obtain the dynamic stresses only. The dynamic strains and displacements are obtained from a separate procedure.

3) Incremental elastic with rules for loading and unloading (total stress).

4) Incremental elastic with shear-volume coupling effects to allow pore pressure generation on a per cycle basis for undrained conditions (loose-coupled effective stress)

5) Plastic and viscoplastic models shear-volume coupling effects to allow a fully coupled effective stress analysis.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Second Conference

Publisher

University of Missouri--Rolla

Publication Date

3-11-1991

Document Version

Final Version

Rights

© 1991 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 11th, 12:00 AM Mar 15th, 12:00 AM

General Report Session 1: Static and Dynamic Soil Parameters and Constitutive Relations of Soils

St. Louis, Missouri

The soil parameters that are commonly of interest in dealing with earthquake and soil dynamics problems are:

1) The maximum shear modulus G0, or the shear wave velocity, Vs.

2) The variation of secant shear modulus with shear strain level, G/G0 vs γ.

3) Equivalent viscous damping as a function of strain.

4) Other parameters such as, dilatometer modulus, normalized SPT or CPT value, state parameters, formation factor.

In terms of constitutive relations the following models have been used:

1) Linear elastic (total stress) - appropriate at very small strains < 10-3%.

2) Equivalent linear elastic with equivalent viscous damping to account for hysteretic damping (total stress). Where pore pressure rise and liquefaction is of concern, this approach is used to obtain the dynamic stresses only. The dynamic strains and displacements are obtained from a separate procedure.

3) Incremental elastic with rules for loading and unloading (total stress).

4) Incremental elastic with shear-volume coupling effects to allow pore pressure generation on a per cycle basis for undrained conditions (loose-coupled effective stress)

5) Plastic and viscoplastic models shear-volume coupling effects to allow a fully coupled effective stress analysis.