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 Web site:||http://dx.doi.org/10.1201/b17395-126|
|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: http://www.routledge.com/9781138027077|
|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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