Submitted on: 27 April 2000.
Revised on: 24 June 2000.
Accepted on: 06 August 2000.
___________________Geomechanics and Engineering---TECHNO-PRESS
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Submitted on: 24 August 2001.
Revised on: 05 December 2001.
Accepted on: 20 January 2002.
___________________Geomechanics and Engineering---TECHNO-PRESS
Submitted on: 03 March 2012.
Revised on: 25 June 2012.
Accepted on: 04 August 2012.
___________________Geomechanics and Engineering---TECHNO-PRESS
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Submitted on: 14 November 2014.
Revised on: 06 January 2015.
Accepted on: 06 February 2015.
___________________Geomechanics and Engineering---TECHNO-PRESS
Submitted on: 23 August 2001.
Revised on: 24 September 2001.
Accepted on: 06 November 2001.
___________________Geomechanics and Engineering---TECHNO-PRESS