Mitigation of Liquefaction Hazard Using Granular Piles

Mitigation of Liquefaction Hazard Using Granular Piles

A. Murali Krishna (Indian Institute of Technology Guwahati, India)
DOI: 10.4018/978-1-5225-6948-0.ch004

Abstract

Ground improvement techniques are employed to mitigate liquefaction hazards. Granular piles are the most widely preferred alternative all over the world, due to several advantages associated with them. Different mechanisms operate in the function of stone columns/granular piles in liquefaction mitigation like drainage, storage, dilation, densification, and reinforcement. This chapter presents an overview of the use of granular piles as a liquefaction remedial measure for sand deposits. A brief description on the phenomenon of liquefaction and the associated features has been presented. A short discussion on various ground improvement methods available for liquefaction mitigation is presented in light of importance of granular piles. Different installation methods and design concepts for granular piles are presented. Various mechanisms of granular piles in mitigating the liquefaction potential of loose sand deposits are discussed and quantified in detail proving their effectiveness in hazard mitigation.
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Liquefaction, Its Effects, And Evaluation

One of the major consequences of earthquakes is the phenomenon of ‘liquefaction’. The concept of liquefaction gathered worldwide attention in the 1960’s, when in 1964 large magnitude earthquakes located near Anchorage, Alaska and Niigata, Japan caused massive structural damage through ground failure. Significant amount of work on this topic has been performed in the last few decades since these earthquakes, resulting in several state-of-the-art papers relating to the study, evaluation and remediation of liquefaction (Martin et al. 1975; Seed, 1979; Ishihara, 1993; Seed et al. 2001; Youd et al. 2001; Idriss & Boulanger, 2005; Sawicki & Mierczynski, 2006; Madabhushi 2007 etc.).

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