A New Laboratory Procedure to Study Stress Relief in Soil Samples

Shear wave velocity is an important mechanical/dynamic parameter allowing the characterization of a soil in the elastic range (γ < 0.001 %). Thirty five existing laboratory correlations of small strains shear modulus or shear wave velocity were examined in this study and are grouped into different general forms based on their geotechnical properties. A database of 11 eastern Canadian clay deposits was selected and used for the critical insights. The effect of the coefficient of earth pressure at rest was also examined. A range of variation for each general form of correlation was determined to take the plasticity index and void ratio values of investigated sites into account. The analysis shows a significant scatter in normalized shear wave velocity values predicted by existing correlations and raises questions on the applicability of these correlations, especially for eastern Canadian clays. New correlations are proposed for Champlain clays based on laboratory measurement of shear wave velocity using the piezoelectric ring actuator technique, P-RAT, incorporated in consolidation cells. An analysis of P-RAT results reveals the sample disturbance effect and suggests an approach to correct the effect of disturbance on laboratory shear wave velocity measurements. The applicability of the proposed correlations, including the disturbance correction, is validated by comparison with in situ measurements using multi-modal analysis of surface waves (MMASW).

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Critical insights in laboratory shear wave velocity correlations of clays

Elbeggo

Ethier

Dubé

et al. 2022

Can. Geotech. J.

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Field Rebound and Recompression Curve of Soft Clay

Chen

Zhou

et al. 2021

Geotechnical Testing Journal

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During sampling and sample preparation, the soil specimen is disturbed, which is accompanied by a decrease in void ratio, and the stresses within it release from in situ status to a residual one, usually associated with an expansion to some extent. As a result, the in situ void ratio and field recompression index, i.e., ev0 and CFR, change to e0 and CLR, respectively, which have not been properly accounted for in the traditional method. A rebound-recompression method (RRM) is proposed in this article for the derivation of a field compression curve from laboratory compression test results, with techniques being developed to modify these two parameters from laboratory measurements to field ones. This method has the clear advantage that the rebound and recompression behavior prior to the yield stress can be satisfactorily captured. Moreover, criterion to assess the sampling and preparation quality of soil samples is also proposed. This new method is validated against three consolidation tests with differing stress paths. In addition, measurements from an excavation in the field suggest that the RRM yields reliable results and highlight the nonconservativeness of the traditional method in deep excavation engineering.

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A New Laboratory Procedure to Study Stress Relief in Soil Samples

Cited by 2 publications

References 15 publications

Critical insights in laboratory shear wave velocity correlations of clays

Critical insights in laboratory shear wave velocity correlations of clays

Field Rebound and Recompression Curve of Soft Clay

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