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Laboratory Investigation on the Saturation and Initial Structure Effects on the Undrained Behavior of Granular Soil Under Static Loading

Keywords: liquefaction , sand , dry funnel pluviation , wet deposition , confining pressure , pore pressure , compression , undrained , saturation

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Abstract:

The effects of the initial state of the samples and the saturation evaluated in termsof Skempton's pore pressure B on the behavior of Chlef sand were studied in this article.For this purpose, the results of two series of undrained monotonic compression tests onmedium dense sand (RD= 50%) are presented. In the first test series, the influence of thespecimens’ fabric and confining pressure is studied. Triaxial specimens containing Chlefsand with 0.5% non plastic silt content were isotropically consolidated to 50 kPa, 100 kPaand 200 kPa. The specimens were formed using both dry funnel pluviation and wetdeposition. The results indicate that the confining pressure and the method of samplepreparation have a significant influence on the liquefaction resistance of the sand. In thesecond series of tests, the saturation influence on the resistance to the sand liquefaction isrealized on samples at an effective stress of 100 kPa for Skempton's pore pressurecoefficient varying between 32% and 90%. It was found that an increase in the Skempton' Spore pressure coefficient B reduces the soil dilatancy and amplifies the phase ofcontractancy.

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