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Summer Research Fellowship Programme of India's Science Academies

Evaluation on earthquake induced liquefaction

Panchali Deb Nath

Techno College of Engineering Agartala, Maheskhola, Agartala, West Tripura 799004

Gali Madhavi Latha

Professor, Department of Civil Engineering, Indian Institute of Science, Bengaluru, Karnataka 560012

Abstract

Liquefaction is a phenomenon in which a cohesionless soil temporarily loses strength and behaves as a viscous liquid rather than a solid due to increase of pore pressure and reduction of the effective stress. Liquefaction can cause excessive ground surface settlements, lateral spreading, landslides, sand boils, foundation failure and result in significant economic losses. This study builds on previously published investigations which have documented various aspects of liquefaction including the influence of earthquake intensity and duration, site conditions, underground structures, the grain size of the liquefied material, confining pressure on soil and ageing of the deposited soil. This report presents a discussion on the mechanism of earthquake induced liquefaction and also pinpoints the processes that are influencing the liquefaction resistance of sand.

Keywords: liquefaction, steady state, critical state, cyclic stress ratio, cyclic resistance ratio, ground motion

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