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Correcting Liquefaction Resistance of Unsaturated Soil Using Wave Velocity

Hossain, Akhter M. / Andrus, Ronald D. / Camp, William M.

Abstract

Explicit empirical relationships for correcting liquefaction resistance of unsaturated soil below the groundwater table using compression wave velocity ( $V_{P}$ ) and shear wave velocity ( $V_{S}$ ) are derived and evaluated in this paper. The relationships are derived using published laboratory test data for four different sands and one silt material. The laboratory test data based on $V_{P}$ exhibit less scatter than the test data based on the ratio $V_{P} / V_{S}$ . For this reason, the $V_{P}$ -based relationship is recommended for correcting the liquefaction resistance of unsaturated soil. The influence of loading cycles and relative density on the recommended relationship is investigated. From a review of 40 field case history sites, it is found that in the critical layers at 20% of the sites, average $V_{P}$ is less than 1,400 m/s, indicating unsaturated conditions. Liquefaction resistances computed for eight field case histories with $V_{P} < 1,200 m/s$ in the critical layers are corrected and plotted on penetration- and $V_{S}$ -based liquefaction evaluation charts. The results support the use of the correction for unsaturated conditions below the groundwater table.

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Correcting Liquefaction Resistance of Unsaturated Soil Using Wave Velocity

Hossain, Akhter M. / Andrus, Ronald D. / Camp, William M.

Abstract

Explicit empirical relationships for correcting liquefaction resistance of unsaturated soil below the groundwater table using compression wave velocity ( $V_{P}$ ) and shear wave velocity ( $V_{S}$ ) are derived and evaluated in this paper. The relationships are derived using published laboratory test data for four different sands and one silt material. The laboratory test data based on $V_{P}$ exhibit less scatter than the test data based on the ratio $V_{P} / V_{S}$ . For this reason, the $V_{P}$ -based relationship is recommended for correcting the liquefaction resistance of unsaturated soil. The influence of loading cycles and relative density on the recommended relationship is investigated. From a review of 40 field case history sites, it is found that in the critical layers at 20% of the sites, average $V_{P}$ is less than 1,400 m/s, indicating unsaturated conditions. Liquefaction resistances computed for eight field case histories with $V_{P} < 1,200 m/s$ in the critical layers are corrected and plotted on penetration- and $V_{S}$ -based liquefaction evaluation charts. The results support the use of the correction for unsaturated conditions below the groundwater table.

Correcting Liquefaction Resistance of Unsaturated Soil Using Wave Velocity

Hossain, Akhter M. / Andrus, Ronald D. / Camp, William M.

Abstract

Explicit empirical relationships for correcting liquefaction resistance of unsaturated soil below the groundwater table using compression wave velocity ( $V_{P}$ ) and shear wave velocity ( $V_{S}$ ) are derived and evaluated in this paper. The relationships are derived using published laboratory test data for four different sands and one silt material. The laboratory test data based on $V_{P}$ exhibit less scatter than the test data based on the ratio $V_{P} / V_{S}$ . For this reason, the $V_{P}$ -based relationship is recommended for correcting the liquefaction resistance of unsaturated soil. The influence of loading cycles and relative density on the recommended relationship is investigated. From a review of 40 field case history sites, it is found that in the critical layers at 20% of the sites, average $V_{P}$ is less than 1,400 m/s, indicating unsaturated conditions. Liquefaction resistances computed for eight field case histories with $V_{P} < 1,200 m/s$ in the critical layers are corrected and plotted on penetration- and $V_{S}$ -based liquefaction evaluation charts. The results support the use of the correction for unsaturated conditions below the groundwater table.

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Title:

Correcting Liquefaction Resistance of Unsaturated Soil Using Wave Velocity

Contributors:

Hossain, Akhter M. (author) / Andrus, Ronald D. (author) / Camp, William M. (author)

Published in:

Journal of Geotechnical and Geoenvironmental Engineering ; 139 ; 277-287

Publication date:

2012-05-16

Size:

112013-01-01 pages

ISSN:

1090-0241 , 1943-5606

DOI:

https://doi.org/10.1061/(ASCE)GT.1943-5606.0000770

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

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