Determination of intergranular strain parameters and their dependence on properties of grain assemblies

Abstract

Intergranular strain parameters of the extended Hypoplastic model are determined from laboratory experiments. Simple static triaxial setup coupled with controlled stress path test method is employed to determine the parameters. Parameters are determined for 4 different naturally existing sands acquired from field. The dependence of the intergranular strain parameters, on density and stress state of the sand is studied and recommendations are made for the selection of mean values in the relevant range of stresses and densities. The variation in the magnitude of intergranular strain parameters is studied in accordance with the varying grain assembly properties. The strain range within which the incremental stiffness remains constant after strain reversal is studied in conjunction with the grain properties and the validity of the assumption that the governing parameter is a material independent constant is commented upon.