A micromechanical hydro-mechanical-damage coupled model for layered rocks considering multi-scale structures

An anisotropic Hydro-Mechanical-Damage coupled model was established in the framework of thermodynamics for saturated layered rocks, which contain arbitrarily-distributed cracks smaller scales and orientated bedding planes much larger scales. The proposed considers damage growth frictional sliding shear dilatancy planes, as well interaction between planes. Numerical implementation nonlinear developed based on TOUGHREACT, is a well-established simulator multiphase fluid flow reactive transport analysis. first validated with laboratory water injection test results rock blocks, then used to study effects rates, situ stresses processes at field scale, demonstrating importance consider variation multi-scale structures better understanding Hydro-Mechanical responses rocks.