Location

San Diego, California

Session Start Date

3-26-2001

Session End Date

3-31-2001

Abstract

Various experimental studies have shown that soil micro-structure strongly influences the small strain stiffness and damping (G0, D0) of fine-grained soils, as well as their variation with shear strain γ. This dependency, in turn, is expected to influence the local site response. This paper firstly synthesizes the dependency of G0 and D0 on stress state through power relationships, expressed in terms of dimensionless parameters, obtained by fitting a large number of experimental data collected on normally consolidated natural clays. Thereafter, these parameters were correlated to soil micro-structure, by assuming the plasticity index Ip as a representative index property. Subsequently, in order to verify the effect of micro-structure on the local site response, a numerical sensitivity study was carried out on a reference subsoil by introducing in the 1D wave propagation model both non-linearity and hetherogeneity as correlated to variations of Ip.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

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

Meeting Name

Fourth Conference

Publisher

University of Missouri--Rolla

Publication Date

3-26-2001

Document Version

Final Version

Rights

© 2001 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 26th, 12:00 AM Mar 31st, 12:00 AM

Influence of Micro-Structure on Small-Strain Stiffness and Damping of Fine Grained Soil and Effects on Local Site Response

San Diego, California

Various experimental studies have shown that soil micro-structure strongly influences the small strain stiffness and damping (G0, D0) of fine-grained soils, as well as their variation with shear strain γ. This dependency, in turn, is expected to influence the local site response. This paper firstly synthesizes the dependency of G0 and D0 on stress state through power relationships, expressed in terms of dimensionless parameters, obtained by fitting a large number of experimental data collected on normally consolidated natural clays. Thereafter, these parameters were correlated to soil micro-structure, by assuming the plasticity index Ip as a representative index property. Subsequently, in order to verify the effect of micro-structure on the local site response, a numerical sensitivity study was carried out on a reference subsoil by introducing in the 1D wave propagation model both non-linearity and hetherogeneity as correlated to variations of Ip.