NEW INSIGHTS IN THE LIQUEFACTION POTENTIAL EVALUATION METHODS FOR SOILS

Abstract eng:
The paper analyses the evaluation of the liquefaction potential based on in situ tests. The four studied methods are those recommended by the NCEER and those proposed by Boulanger and Idriss. These methods are based on the cyclic stress approach, which characterizes both earthquake loading and soil liquefaction resistance in terms of cyclic stresses. Liquefaction resistance is based on two field tests results, namely SPT and CPT. An extensive analysis is carried out to understand and compare the results obtained. The factor of safety against liquefaction is discussed in terms of many parameters particularly the depth, the percentage of fines and the number of blows N. The analyzed case study is a site in Qatar. Hundreds of CPT and SPT were performed at this site where the foundation soil is calcareous sand, this kind of soil being not commonly considered in the literature. As far as factors of safety against liquefaction are concerned, the results are very close in general, and correspond to the geological and geotechnical soil profile. Analysis shows that the CPT Boulanger and Idriss method is the most conservative. The case study wants to contribute to the understanding of the factors that influence the cyclic stress approach. The SPT resistance is most commonly used but the CPT resistance approach must be gaining more fields in future earthquake geotechnical engineering projects.

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