Analysis of the effect of fines content and loading frequency on the shear modulus and damping ratio of gravels

Abstract

The dynamic properties of coarse granular soils have been much less studied than in sands. From a database of 14 gravel samples subjected to cyclic triaxial tests, available relationships are studied and new proposed to estimate the normalised shear modulus G/G max and the damping ratio D as a function of shear strain γ. The effect of confining stress, fines content, uniformity coefficient and loading frequency on the variation of G/ G max and D versus γ is analysed. It is obtained that G/G max is dependent on confinement, but not on loading frequency. 85.6% of the data converge in an error band of less than 25% for the proposed formulation. The damping D does depend on fines content as well as confinement and loading frequency. The proposed formulation for D has a 56% probability of having errors less than 25%. estudiadas que en arenas. A una base de de 14 muestras de gravas sometidas a ensayos triaxiales cíclicos, estudian relaciones disponibles y se proponen para estimar el módulo de corte normalizado G/G max y de G/G max y G/G max confinamiento, la de carga. 85.6% de los datos converge una banda de error menor al 25% para la formulación propuesta.