A linearized porous brittle damage material model with distributed frictional-cohesive faults

We present a simplified model of damaging porous material, obtained through consistent linearization from a recursive-faulting material model described in (Pandolfi et al. 2016). The brittle damage material model is characterized by special planar micro-structures, consisting of nested families of e...

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Bibliographic Details
Published in:Engineering geology 2016-12, Vol.215, p.10-24
Main Authors: De Bellis, M.L., Della Vecchia, G., Ortiz, M., Pandolfi, A.
Format: Article
Language:English
Subjects:
Boreholes
Brittle damage
Brittleness
Damage
Faults
Hydraulic conductivity
Kinematics
Mathematical models
Multiscale modelling
Parameters
Porous materials
Porous media
Recursive faulting
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Summary:We present a simplified model of damaging porous material, obtained through consistent linearization from a recursive-faulting material model described in (Pandolfi et al. 2016). The brittle damage material model is characterized by special planar micro-structures, consisting of nested families of equi-spaced frictional-cohesive faults in an otherwise elastic matrix material. The linear kinematics model preserves the main microstructural features of the finite kinematics one but offers a far better computational performance. Unlike models commonly employed in geo-mechanical applications, the proposed model contains a small number of parameters, to wit, two elastic moduli, three frictional-cohesive parameters, and three hydraulic response parameters, all of which having clear physical meanings and amenable to direct experimental measurement through standard material tests. The model is validated by comparison to triaxial hydro-mechanical experimental data. Despite the paucity of material constants, the salient aspects of the observed behavior are well captured by the model, qualitatively and quantitatively. As an example of application of the model, we simulate the excavation of a borehole in a rocky embankment. •Cohesive/frictional microstructures for hydro-mechanical behavior of confined rocks•Microstructures assume the form of parallel faults at different levels of recursion.•Model characterized by seven mechanical parameters: elastic, cohesive and hydraulic•Fracture patterns optimal for the ability to relieve deviatoric stresses in rocks•Attendant permeability enhancement computed by recourse to channel flow principles
ISSN:0013-7952
1872-6917
DOI:10.1016/j.enggeo.2016.10.010