A damage-plasticity model for cohesive fractures. (January 2015)

• Record Type: Journal Article
• Authors: Pouya, Ahmad; Bemani Yazdi, Pedram
• Is Part Of: International journal of rock mechanics and mining sciences. Volume 73(2015:Jan.)
• Page Start: 194
• Page End: 202
• Publication Date: 2015-01
• Subjects: Rock joints -- Fractures -- Cohesive cracks -- Plasticity -- Damage -- Constitutive model; 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.2014.09.024
• Languages: English
• ISSNs: 1365-1609

Abstract

Abstract: A model for the elastic-plastic deformation and damage process in rock joints and interfaces in quasi-brittle geomaterials is proposed. A close analysis of damage process in interfaces in quasi-brittle geomaterials, represented in cohesive crack models, shows that these models represent well also the damage process in rock joints. The commonly used non-linear elastic-plastic models of rock joints are completed by this damage process and extended to a general model for cohesive fractures which cover rock joints and cohesive cracks. This model reproduces well the main aspects of deformation and damage of cohesive fractures observed experimentally, namely, a non-linear elastic behavior before the stress peak, softening and decrease of the tensile and shear strengths with post-peak deformation, stiffness reduction after stress peak, general trends of irreversible relative displacements and existence of a residual stiffness in ultimate state under compression and shear. This model was fitted to several series of experimental results obtained on different geomaterials and a satisfying agreement between the model and experimental data was obtained. Highlights: The effects of damage process in rock joints behavior and rock slope instability are underlined. A model combining plastic deformation and damage process in rock joints and cohesive cracks is proposed. It is shown that the model reproduces well the main features of elastic-plastic and damage behavior of cohesive fractures. The model has been validated by comparison to several sets of experimental data.