Abstract
We have theoretically studied shear strength of an elastic-plastic water-filled interface between purely elastic permeable blocks under initial compression. We used a recently developed “hybrid” model that combines discrete element method and finite-difference approach. In the framework of the model the multiscale porous structure is taken into account implicitly by assigning the porosity and permeability values for the enclosing skeleton which determine the rate of filtration of a fluid. Macroscopic pores and voids are taken into account explicitly by specifying the geometry of discrete elements computational domain. The relationship between the stress-strain state of the solid skeleton and pore fluid pressure is described in the framework of the Biot’s model of poroelasticity. The results of simulation show that shear strength of an elastic-plastic interface depends non-linearly on the values of permeability and loading parameters. We have proposed an analytical relation that approximates the obtained results of numerical simulation.
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