Modelling tertiary creep in geomaterials using a continuum damage mechanics approach

Osman, A.S; Birchall, T.J.

Abstract

Tertiary creep is often observed in soft rocks and it represents a problem in a mining environment. Tertiary creep behaviour appears due to progressive micro cracking of the material and would result in a loss of strength and stiffness, which may eventually lead to failure and a complete loss of load carrying capability of the material. In this paper, the authors combined the continuum damage mechanics within the framework of hyperplasticity, thus encompassing viscoplasticity and damage within a single theory. The authors present a family of models which obeys the laws of thermodynamics. The entire constitutive behaviour is derived from two scalar potentials; a free energy potential which provides the elasticity law, and a dissipation potential which provides the yield function, the direction of plastic flow and the evolution of a damage variable. No additional assumptions are required. These new models require only few parameters which have physical meanings and are capable of capturing tertiary creep observed in soft rocks.

Citation

Osman, A., & Birchall, T. (2014, August). Modelling tertiary creep in geomaterials using a continuum damage mechanics approach. Presented at International Symposium on Geomechanics from Micro and Macro, Cambridge, UK

• Presentation Conference Type: Conference Paper (published)
• Conference Name: International Symposium on Geomechanics from Micro and Macro
• Online Publication Date: Aug 26, 2014
• Publication Date: Aug 26, 2014
• Deposit Date: Jan 4, 2016
• Publicly Available Date: Jan 21, 2016
• Pages: 705-708
• Book Title: Geomechanics from micro to macro.
• ISBN: 9781138027077
• DOI: https://doi.org/10.1201/b17395-126
• Public URL: https://durham-repository.worktribe.com/output/1152227
• Publisher URL: https://www.taylorfrancis.com/books/e/9781315737324/chapters/10.1201%2Fb17395-45