Effect of overconsolidation on cyclic resistance correction factors Ks and Ka

V. Manmatharajan, S. Sivathayalan

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Laboratory Testing

ABSTRACT: Results of a comprehensive experimental study to assess the effects of overconsolidation on liquefaction potential are presented. Cyclic simple shear tests were conducted on a sub-angular sand at different void ratio, OCR, and stress (confining and shear) states. Liquefaction susceptibility is highly influenced by overconsolidation, and even fairly small levels of OCR can significantly increase the cycle resistance. The K factor is highly influence by OCR, but the effect of OCR on the K correction factor is not significant. Appropriate consideration of the benefits of overconsolidation can lead to potential cost savings in liquefaction resistant designs.

RESUMEN: Se presentan los resultados de un estudio experimental para la evaluación de los efectos de sobre-consolidación en la licuefacción de suelos granulares. Los ensayes consistieron en pruebas de cortante en arenas con aristas suaves y con diferentes valores de porosidad, razón de sobre-consolidación, así como esfuerzos de confinamiento y cortante. Los resultados indican que la propensidad a la licuefacción se ve influenciada grandemente por la sobre-consolidación. Aun a niveles bajos de sobre-consolidación la resistencia a solicitaciones cíclicas puede aumentarse significativamente. El factor K también se vé influenciado por la razón de sobre-consolidación; sin embargo esta razón no afecta el factor de corrección K. Una consideración adecuada de los beneficios de la sobre-consolidación puede resultar en ahorros económicos importantes en los diseños resistentes a la licuefacción.

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Cite this article:
V. Manmatharajan; S. Sivathayalan (2011) Effect of overconsolidation on cyclic resistance correction factors Ks and Ka in GEO2011. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO11Paper395,author = V. Manmatharajan; S. Sivathayalan ,title = Effect of overconsolidation on cyclic resistance correction factors Ks and Ka,year = 2011}