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2022 12 Interfaces with BBM

The model includes an interface that uses modified properties of BBM: Friction parameter M has been reduced by a factor R=0.6, Poisson ratio has been recalculated to 0.4 instead of 0.3 using the same factor, Swelling parameters for the interface are set to 0 (BBM model), Porosity has been increased to 0.6 (instead of 0.43) at the interface zone which increases permeability and reduces capillary pressure at the initial conditions, Parameters for hydraulic laws are the same as for the buffer. The model has been developed for GiD16. The pdf document explains this model among other cases.