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Many geologic materials have a composite structure, in which macroscopicmechanical behavior is determined by the properties, shape, and heterogeneousdistribution of individual constituents. In particular, sedimentary rockscommonly exhibit a layered microstructure, with distinct bedding planes thatcan also form planes of weakness. In this work, we present a homogenizationframework for modeling inelastic layered media. The proposed constitutive modelallows for distinct micro-constitutive laws for each layer, explicitrepresentation of layer distributions, as well as incorporation of imperfectbonding at the interface between adjacent layers. No a priori assumptions areneeded regarding the specific consitutive models used for the layers andinterfaces, providing significant modeling flexibility. The overall frameworkprovides a simple and physically-motivated way of defining anisotropic materialbehavior as an emergent property of the layered microstructure. The model iscalibrated using triaxial and true-triaxial experimental data to demonstrateits ability to describe anisotropic deformation and multiple modes of failure.

An Inelastic Homogenization Framework for Layered Materials with Planes of Weakness