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A Microplane-Based Anisotropic Damage Model for Deformation and Fracturing of Brittle Rocks

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Abstract

Anisotropy is an important property that is widely present in crustal rocks. Efforts have been devoted to providing a constitutive model that can describe both inherent and stress-induced anisotropy in rock. Different from classic models, that are based on stress invariants or strain tensors, we propose here an anisotropic damage microplane model to capture the characteristics of rock properties in different orientations (i.e., their anisotropy). The basic idea is to couple continuum damage mechanics with the classic microplane model. The stress tensor in the model is dependent on the integration of microplane stresses in all orientations. The damage state of any element in the model is determined by the microplane that satisfies the maximum tensile stress criterion or Mohr–Coulomb criterion. An ellipsoidal function was used to characterize the failure strength, where the orientation of the failure plane changes with the preferred orientation of defects in the rock. The proposed model is validated against laboratory experiments performed on brittle material with orientated cracks and granite under true triaxial compression. The fracture pattern and the effect of the intermediate principal stress are numerically predicted by our anisotropic damage model and we discuss relationships between the damage evolution and the anisotropy of the rock under true triaxial compression. The proposed numerical model, based on microplane theory, offers a new approach to analyzing the effect of crack orientation on the deformation and fracture of brittle rock.

Highlights

  • Microplane-based anisotropic damage model incorporating maximum tensile stress criterion and Mohr-Coulomb criterion is proposed.

  • Peak strength and elastic modulus vary with the preferred crack/damage angles.

  • Fracture pattern of brittle rock and the effect of intermediate principal stress in true triaxial compressive tests is numerically replicated.

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Data availability

The data that support the findings of this study are available on request from the corresponding author Tao Xu.

Abbreviations

\({\varepsilon }_{ij}, {\sigma }_{ij}\) :

Strain and stress tensor

\({\varepsilon }_{N}, {\varepsilon }_{T}\) :

Normal and tangential strain in microplane

\({\varepsilon }_{M}, {\varepsilon }_{L}\) :

Two components of the tangential strain in microplane

\({n}_{i}, {n}_{j}\) :

Unit normal vector, \(i, j=\mathrm{1,2},3.\)

\({l}_{i}, {l}_{j}, {m}_{i}, {m}_{j}\) :

Components of unit tangential vector, \(i, j=\mathrm{1,2},3.\)

\({E}_{N}, {E}_{T}\) :

Normal and tangential elastic modulus

ν :

Poisson’s ratio

Ω :

Surface of unit sphere

k, kth :

Microplane number

\({\omega }_{k}\) :

Integration weights of kth microplane

\({N}_{m}\) :

Total number of microplanes

u :

Scale parameter of elements

\({u}_{0}\) :

Average parameter of elements

w :

Heterogeneity index

\({\sigma }_{N}^{k}, {\sigma }_{T}^{k}\) :

Normal stress and tangential stress of kth microplane

\({\sigma }_{t0}, {\sigma }_{c0}\) :

Ultimate tensile strength and compression strength

\({S}_{0}\) :

Ultimate strength of element

\({\theta }_{f},{c}_{0}\) :

Friction angle and cohesion

\(E, E^{\prime}\) :

Undamaged and effective elastic modulus

D, D t , D c :

Damage variable, tensile damage, shear damage under compression

\({\varepsilon }_{t0}, {\varepsilon }_{c0}\) :

Ultimate strain corresponding to the \({\sigma }_{t0}\) and \({\sigma }_{c0}\)

η :

Residual strength coefficient (RSC)

AC, a, b, c :

Anisotropy coefficient

\({\theta }_{x}\) :

Angle between the preferred orientation and X-axis

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Acknowledgements

The work was jointly supported by National Natural Science Foundation of China (42172312, 51974062, and 52211540395) and a Royal Society-Newton Mobility Grant (IEC\NSFC\170625). M.J. Heap acknowledges support from the Institut Universitaire de France (IUF).

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Yuan, Y., Xu, T., Meredith, P.G. et al. A Microplane-Based Anisotropic Damage Model for Deformation and Fracturing of Brittle Rocks. Rock Mech Rock Eng 56, 6219–6235 (2023). https://doi.org/10.1007/s00603-023-03363-7

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