Location

San Diego, California

Session Start Date

3-26-2001

Session End Date

3-31-2001

Abstract

Time histories of the p-y behavior during soil liquefaction, defined as the relation between subgrade reaction and relative displacement between pile and soil, are back-calculated based on shaking table tests using a large-scale laminar box. The results show that, if the pile pushes the soil, the subgrade reaction is correlated with the relative displacement between pile and soil. In contrast, if the soil liquefies and pushes the pile, the subgrade reaction becomes correlated with the relative velocity between pile and soil. The p-y curve of loose sand shows stress-softening behavior after liquefaction, while the p-y curve of medium dense to dense sand shows stress hardening behavior. The stress-hardening behavior tends to diminish with cyclic loading after liquefaction if the sand is not sufficiently dense or the input acceleration is high. The coefficient of subgrade reaction is affected by such factors as the pore pressure ratio, relative displacement, and soil density.

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

Back-Calculated p-y Relation of Liquefied Soils from Large Shaking Table Tests

San Diego, California

Time histories of the p-y behavior during soil liquefaction, defined as the relation between subgrade reaction and relative displacement between pile and soil, are back-calculated based on shaking table tests using a large-scale laminar box. The results show that, if the pile pushes the soil, the subgrade reaction is correlated with the relative displacement between pile and soil. In contrast, if the soil liquefies and pushes the pile, the subgrade reaction becomes correlated with the relative velocity between pile and soil. The p-y curve of loose sand shows stress-softening behavior after liquefaction, while the p-y curve of medium dense to dense sand shows stress hardening behavior. The stress-hardening behavior tends to diminish with cyclic loading after liquefaction if the sand is not sufficiently dense or the input acceleration is high. The coefficient of subgrade reaction is affected by such factors as the pore pressure ratio, relative displacement, and soil density.