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Submitted on: 14 December 2001.
Revised on: 16 March 2002.
Accepted on: 09 May 2002.
___________________Australian Geomechanics Journal
Submitted on: 11 March 2003.
Revised on: 11 May 2003.
Accepted on: 01 June 2003.
___________________Australian Geomechanics Journal
Submitted on: 25 July 2019.
Revised on: 12 October 2019.
Accepted on: 29 November 2019.
___________________Australian Geomechanics Journal