Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

The procedure used in this research work for evaluation of liquefaction potential due to earthquake is by correlating the cyclic stress ratio(CSR) and the cyclic resistance ratio(CRR) obtained from standard penetration test and shear wave velocity. Shear wave velocity in the different layers of soils have been determined by the use of down borehole instrument. P- and S-wave velocity data of nearsurface soils (upper 21 m) are analyzed and correlated to depth and sedimentological properties. The results show that the S-wave velocity is much more sensitive to changes in lithology and mechanical properties than the P-wave velocity, which is characterized by a narrow range of values. The data shows that Vs is better correlated with silt content than with clay content for the sediments of the area investigated. While Vs has increased with increasing clay content it decreases with increasing silt content. Model curves for earthquake of various magnitudes have been developed after detailed study and analysis of the enormous data. This model curves serve the purpose of demarcating the zones of liquefaction and non-liquefaction. Using these model curves and assuming an earthquake of a particular magnitude for which the model curves have been plotted, the liquefaction potential of soil if subjected to earthquake of that particular magnitude can be evaluated.

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

Evaluation of Liquefaction Potential of Soil by Down Borehole Method

San Diego, California

The procedure used in this research work for evaluation of liquefaction potential due to earthquake is by correlating the cyclic stress ratio(CSR) and the cyclic resistance ratio(CRR) obtained from standard penetration test and shear wave velocity. Shear wave velocity in the different layers of soils have been determined by the use of down borehole instrument. P- and S-wave velocity data of nearsurface soils (upper 21 m) are analyzed and correlated to depth and sedimentological properties. The results show that the S-wave velocity is much more sensitive to changes in lithology and mechanical properties than the P-wave velocity, which is characterized by a narrow range of values. The data shows that Vs is better correlated with silt content than with clay content for the sediments of the area investigated. While Vs has increased with increasing clay content it decreases with increasing silt content. Model curves for earthquake of various magnitudes have been developed after detailed study and analysis of the enormous data. This model curves serve the purpose of demarcating the zones of liquefaction and non-liquefaction. Using these model curves and assuming an earthquake of a particular magnitude for which the model curves have been plotted, the liquefaction potential of soil if subjected to earthquake of that particular magnitude can be evaluated.