ARMA 12-260 A Double Structure Constitutive Model for Expansive Clays: Problems for Verification in Sierra Mechanics

摘要

An important application of expansive clay materials is their use as engineered barriers or seals in radioactive waste repositories. The low permeability of clays and the chemical interactions (e. g. sorption) between the clay minerals and radionuclides present in the radioactive waste are essential for reducing the migration distance of the radionuclides over time scales of interest for repository design. This paper describes the efforts underway to incorporate a constitutive model for expansive soils into the Sierra Mechanics finite element code framework being developed at Sandia National Laboratories. Several simple verification problems are described for evaluating the implementation of the model.