A micro-mechanics based viscoplastic model for clayey rocks. (September 2017)

• Record Type: Journal Article
• Authors: Farhat, F.; Shen, W.Q.; Shao, J.F.
• Is Part Of: Computers and geotechnics. Volume 89(2017)
• Page Start: 92
• Page End: 102
• Publication Date: 2017-09
• Subjects: Creep -- Viscoplasticity -- Homogenization method -- Micro-mechanics -- Clayey rocks -- Shale rocks; Engineering geology -- Data processing -- Periodicals; Soil mechanics -- Data processing -- Periodicals; Rock mechanics -- Data processing -- Periodicals; 624.1510285
• DOI: 10.1016/j.compgeo.2017.04.014
• Languages: English
• ISSNs: 0266-352X

Abstract

Abstract: In this study, a micro-mechanics based viscoplastic model is proposed to describe time-dependent deformation for a class of clayey rocks. The heterogeneous rock is represented as a composite material containing a porous clay matrix and mineral inclusions at a mesoscopic scale. The clay matrix is composed of a solid phase and pores at the microscopic scale. The effective plastic yield criterion is determined from a nonlinear homogenization procedure (Shen et al., 2013). This criterion is extended and used as a viscoplastic loading function. Together with a suitable hardening law and a non-associated flow rule, the viscoplastic model is completed. A series of numerical assessments are presented to investigate the influence of porosity and mineral inclusions on the time-dependent deformation of clayey rocks. Comparisons between numerical results and experimental data are also performed and presented for different loading paths.