Location

San Diego, California

Session Start Date

3-26-2001

Session End Date

3-31-2001

Abstract

In the present paper, experimental investigations of dynamic behavior of soils under periodic loading are conducted. Investigations include two aspects. First, effect of confining pressure and loading frequency on soil dynamic behavior and stress-strain relation is studied. Second, effect of confining pressure, loading frequency and amplitude of cyclic shear stress on soil viscosity is investigated. In the first aspect, based on test curves, physical nonlinearity shown in soil stress-strain relation suggests that physical parameters of soil materials are not constant. For example, soil elastic parameters can be a function of cyclic shear strain, confining pressure and loading frequency. In the second aspect, investigation of nonlinear viscosity of soils is focused. Soil viscosity is not assumed to be a constant. In other words, soils behave as non-Newtonian viscous material. Soil samples are used to conduct torsional shear tests under cyclic loading with two different testing conditions. The two testing conditions result in two groups of results that demonstrate nonlinear behavior of soil viscosity under repeated loading. Tests results from the two groups are discussed and analyzed to reach two expressions of soil viscosity. One is expressed as a function of cell pressure, cyclic shear stress and shear strain. The other is written in terms of loading frequency, cyclic strain and cell pressure. Parameters in the two expressions are calibrated from test data using curve fitting technique.

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

Share

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

Soil Viscous Behavior in Response to Torsional Cyclic Loading

San Diego, California

In the present paper, experimental investigations of dynamic behavior of soils under periodic loading are conducted. Investigations include two aspects. First, effect of confining pressure and loading frequency on soil dynamic behavior and stress-strain relation is studied. Second, effect of confining pressure, loading frequency and amplitude of cyclic shear stress on soil viscosity is investigated. In the first aspect, based on test curves, physical nonlinearity shown in soil stress-strain relation suggests that physical parameters of soil materials are not constant. For example, soil elastic parameters can be a function of cyclic shear strain, confining pressure and loading frequency. In the second aspect, investigation of nonlinear viscosity of soils is focused. Soil viscosity is not assumed to be a constant. In other words, soils behave as non-Newtonian viscous material. Soil samples are used to conduct torsional shear tests under cyclic loading with two different testing conditions. The two testing conditions result in two groups of results that demonstrate nonlinear behavior of soil viscosity under repeated loading. Tests results from the two groups are discussed and analyzed to reach two expressions of soil viscosity. One is expressed as a function of cell pressure, cyclic shear stress and shear strain. The other is written in terms of loading frequency, cyclic strain and cell pressure. Parameters in the two expressions are calibrated from test data using curve fitting technique.