THE ELASTIC MODULI OF SOILS WITH DISPERSED OVERSIZE PARTICLES

Abstract eng:
To calculate the elastic deformations experienced by soils subjected to static or dynamic loads, knowledge of the elastic moduli is required. The elastic moduli are normally evaluated in the laboratory using conventional triaxial compressive tests on cylindrical samples. For meaningful test results, it is necessary to maintain a ratio of sample diameter to the maximum particle size of approximately 6 to 1 or greater. However some soils have large and dispersed oversize particles that make it impossible for them to be tested in the conventional triaxial apparatus. This study presents the application of a theoretical method developed by Hashin that calculates the elastic moduli of a composite made of an elastic matrix containing large dispersed particles. The Hashin method requires only knowledge of the elastic moduli of the matrix coupled with the concentration by volume of the large particles in order to calculate the elastic moduli of the mixture. The Hashin method was applied to a clay-sand mixture, and it was found to predict very well its measured elastic moduli. The measurement of the elastic moduli was carried out using an ultrasonic velocity apparatus.

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