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Evaluation of Sample Quality and Correction of Compressibility and Strength Parameters-Experience with Brazil Soft Soils

Sample quality has a direct influence on the results of geo-mechanical parameters obtained in laboratory and in situ tests, potentially causing serious technical and economic consequences. In the study of soft soil behavior using laboratory tests, it is important to evaluate, and be able to quantify sample quality, and if necessary and possible, to correct the effects of sample disturbance and to obtain geotechnical parameters appropriate and necessary for engineering projects. This paper presents and discusses the Brazilian results of sample quality evaluation and the correction of compressibility and strength parameter results to account for the effects of sample disturbance, as well as a review of several papers that address correction and sample quality issues. Proposals presented by Coutinho (2007) and Futai (2010) were used to evaluate sample quality. Proposals presented by Schmertmann (1955), Oliveira (2002), Coutinho (2007) and Futai (2010) were used for correction of compressibility parameters that were altered by the effects of sample disturbance. The results from these study areas were satisfactory for all the proposals. It was possible to obtain compression parameters corresponding to good quality samples using the proposals for correcting the effects of sample disturbance.