Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

The estimation of the large flow deformation in the liquefiable layered ground and its effects on a variety of civil structures and infrastructures is considered to be a significant concern in recent earthquakes. This paper proposes a new practical approach for estimating the appropriate thickness of sub-layers within a soil profile (soil element size) for simulating the post-liquefaction deformation considering the seepage flow of pore water after an earthquake. The findings of recent numerical analysis and extensive series of triaxial tests were utilized to develop the ability to analyze such fundamental issue. The study was conducted based on to the large strain deformations and the realistic interaction between inhomogeneous distribution of permeability in ground, volume change of soil due to seepage after earthquake and the extent of lateral deformation in the liquefied soil profile. Toward the goal, the consequential horizontal displacements and the corresponding volume change due to shear localization in soil elements from a series of centrifuge tests conducted by Kulasingam et al. (2002) at UC-Davis were utilized. The volume change of soil element is proved to be primarily related to its potential of shear deformation based on the results of triaxial tests Yoshimine et al. (2006). This strongly suggests that the magnitude of shear localization and its corresponding lateral flow deformation formed directly beneath low permeability soil sub-layer after shaking event are highly affected by the flow and mechanical conditions of the subsoil as well as its geometry.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

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

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

Determination of the Proper Thickness of Sublayers for Analyzing Post-Liquefaction Deformation Associated with Seepage of Pore Water After Earthquake

San Diego, California

The estimation of the large flow deformation in the liquefiable layered ground and its effects on a variety of civil structures and infrastructures is considered to be a significant concern in recent earthquakes. This paper proposes a new practical approach for estimating the appropriate thickness of sub-layers within a soil profile (soil element size) for simulating the post-liquefaction deformation considering the seepage flow of pore water after an earthquake. The findings of recent numerical analysis and extensive series of triaxial tests were utilized to develop the ability to analyze such fundamental issue. The study was conducted based on to the large strain deformations and the realistic interaction between inhomogeneous distribution of permeability in ground, volume change of soil due to seepage after earthquake and the extent of lateral deformation in the liquefied soil profile. Toward the goal, the consequential horizontal displacements and the corresponding volume change due to shear localization in soil elements from a series of centrifuge tests conducted by Kulasingam et al. (2002) at UC-Davis were utilized. The volume change of soil element is proved to be primarily related to its potential of shear deformation based on the results of triaxial tests Yoshimine et al. (2006). This strongly suggests that the magnitude of shear localization and its corresponding lateral flow deformation formed directly beneath low permeability soil sub-layer after shaking event are highly affected by the flow and mechanical conditions of the subsoil as well as its geometry.