Influence of soil type on the effect of strain rate on small-strain cyclic shear modulus

Vucetic, M.; Tabata, K.

Soils and Foundations 43(5): 161-173


ISSN/ISBN: 0038-0806
Accession: 019205135

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Sixteen different soils were tested in an NGI type simple shear device to examine the effect of strain rate, gamma , on cyclic secant shear modulus, G (sub s) , at very small to small cyclic shear strain amplitudes, gamma (sub c) nearly equal 0.0003-0.01%. The effect of gamma on G (sub s) was characterized by strain-rate shear modulus parameter, alpha (sub G) , and strain-rate shear modulus factor, N (sub gamma -G) . Parameter alpha (sub G) describes the slope of G (sub s) -log gamma data for a given gamma (sub c) , while N (sub gamma -G) is alpha (sub G) normalized by reference G (sub s) . For the clayey soils and their conditions tested alpha (sub G) nearly equal 1.0-6.5 MPa and N (sub gamma -G) nearly equal 2.0-6.0% were obtained. For the sandy soils alpha (sub G) nearly equal 0.3-1.2 MPa and N (sub gamma -G) nearly equal 0.5-3.0% were obtained. Data revealed that alpha (sub G) decreases with increasing gamma (sub c) , while N (sub phi -G) either slightly decreases with increasing gamma (sub c) or stays about constant. The trends of N (sub gamma -G) with plasticity index, I (sub p) , liquid limit, w (sub L) , clay content, and activity were examined. It was found that at a given gamma (sub c) , N (sub gamma -G) generally increases with increasing all of these properties and indices. Most consistent and strongest correlations were obtained between N (sub gamma -G) and I (sub p) and N (sub gamma -G) and w (sub L) . These two correlations can be useful for the soil dynamics engineering practice and are presented in the paper.