Mitigation of Liquefaction Hazard Using Granular Piles

Mitigation of Liquefaction Hazard Using Granular Piles

A. Murali Krishna (Indian Institute of Technology, Guwahati, Guwahati, India)
Copyright: © 2011 |Pages: 23
DOI: 10.4018/jgee.2011010104
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Abstract

In this paper, ground improvement techniques are used to mitigate liquefaction hazards. Granular piles are the preferred alternative due to several advantages. Granular piles improve the ground by reinforcing and adding density to the surrounding soil apart from providing drainage. Different mechanisms operate in the function of stone columns/granular piles in liquefaction mitigation, including Drainage, Storage, Dilation, Densification, and Reinforcement. This paper presents an overview of the use of granular piles as a liquefaction remedial measure for sand deposits. A brief description on liquefaction and the associated features is presented. A short discussion on various ground improvement methods available for liquefaction mitigation is discussed in light of the 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 1960s, 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).

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