Analysis of the Extension of the Elastic Parameters for Modelling Highly Expansive Unsaturated Soils with the Barcelona Basic Model

Modelling of engineered barrier systems (EBS) in deep geological disposals spent nuclear fuel requires sophisticated approaches that include highly nonlinear constitutive models. The Barcelona Basic Model for Expansive soils (BBMEx) is an extension expansive unsaturated the (BBM) slightly-to-moderately soils. In this extension, parameter κ (logarithmic compliance with respect to changes net pressure) BBM extended a function suction and set parameters, id="M2"> s suction) pressure, suction, parameters. On these functions, four conditions which are satisfied considered. For each condition, two results obtained: (1) ranges values parameters such condition all positive pressures non-negative suctions (2) given maximum pressure suctions. should help prevent unrealistic predictions BBMEx. was used carrying out simulation infiltration test different bentonites BBMEx model analysed.