Numerical study of time-dependent deformation and cracking in brittle rocks with phase-field method and application to slope instability analysis. (July 2022)

• Record Type: Journal Article
• Authors: Wang, Meng; Yu, Zhan; Shen, Wanqing; Shao, Jianfu
• Is Part Of: International journal of rock mechanics and mining sciences. Volume 155(2022)
• Publication Date: 2022-07
• Subjects: Damage -- Cracking -- Viscoplastic deformation -- Brittle rocks phase-field method -- Slope instability; 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.2022.105144
• Languages: English
• ISSNs: 1365-1609

Abstract

Abstract: Most rocks exhibit time-dependent deformation and failure. Two main mechanisms are generally considered, the progressive growth of cracks and viscoelastic and/or viscoplastic deformation. In this study, cracking process is described by a viscous phase-field method which is coupled with a viscoplastic model. The evolution of crack field is controlled by both elastic and viscoplastic tensile volumetric and deviatoric strains. The threshold of viscoplastic deformation is weakened by the growth of cracks. The efficiency of the proposed model is first assessed by comparing numerical predictions with experimental data in triaxial compression and creep tests. Then, the proposed model is applied to modeling time-dependent deformation and failure process of a high slope section in the left bank of Jinping-I hydropower station in China. Numerical predictions are compared with field measurements.