A cross-anisotropic elastoplastic model applied to sedimentary rocks. (August 2020)

• Record Type: Journal Article
• Authors: Forero, John H.; Gomes, Guilherme J.C.; Vargas, Eurípedes A.; Falcão, Flávia O.L.; Velloso, Raquel Q.
• Is Part Of: International journal of rock mechanics and mining sciences. Volume 132(2020)
• Publication Date: 2020-08
• Subjects: Sedimentary rocks -- Constitutive relations -- Cross-anisotropic models -- Triaxial tests -- Inverse analysis; Rock mechanics -- Periodicals; Soil mechanics -- Periodicals; Mining engineering -- Periodicals; Roches, Mécanique des -- Périodiques; Sols, Mécanique des -- Périodiques; Technique minière -- Périodiques; 624.151305
• DOI: 10.1016/j.ijrmms.2020.104419
• Languages: English
• ISSNs: 1365-1609

Abstract

Abstract: Strength and deformability properties of sedimentary rocks are difficult to characterize as these geomaterials show anisotropic mechanical behavior, which cannot be adequately evaluated by an isotropic constitutive model. This essay proposes a cross-anisotropic elastoplastic model to evaluate stress–strain relationships of sedimentary rocks. The approach couples the twelve-parameter Lade–Kim isotropic model with a non-uniform scaling of the stress tensor and includes two scaling parameters that link the orientation of the bedding planes with the loading direction. The anisotropic model parameters can be conveniently determined using Bayesian analysis. We illustrate our method using triaxial tests on a variety of confining stresses and bedding plane orientations for a travertine and a Tournemire shale. Our results demonstrate that the predicted maximum deviatoric stresses and the simulated stress–strain curves are shown to be in good agreement with the measured data.