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Modelling tertiary creep in geomaterials using a continuum damage mechanics approach.

Osman, A. S and Birchall, T. J. (2014) 'Modelling tertiary creep in geomaterials using a continuum damage mechanics approach.', in Geomechanics from micro to macro. London: CRC Press, pp. 705-708.


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.

Item Type:Book chapter
Full text:(AM) Accepted Manuscript
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Publisher 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:
Date accepted:No date available
Date deposited:21 January 2016
Date of first online publication:26 August 2014
Date first made open access:No date available

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