Modelling tertiary creep in geomaterials using a continuum damage mechanics approach

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

doi:10.1201/b17395-126

Modelling tertiary creep in geomaterials using a continuum damage mechanics approach

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

Authors

Professor Ashraf Osman ashraf.osman@durham.ac.uk
Professor

T.J. Birchall

Contributors

Kenichi Soga
Editor

Krishna Kumar
Editor

Giovanna Biscontin
Editor

Matthew Kuo
Editor

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). Modelling tertiary creep in geomaterials using a continuum damage mechanics approach. In K. Soga, K. Kumar, G. Biscontin, & M. Kuo (Eds.), Geomechanics from micro to macro (705-708). https://doi.org/10.1201/b17395-126

Conference Name	International Symposium on Geomechanics from Micro and Macro
Conference Location	Cambridge, UK
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

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Copyright Statement
This is an Accepted Manuscript of a book chapter published by Routledge in Geomechanics from Micro to Macro on 26/08/2014, available online: http://www.routledge.com/9781138027077