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Submitted on: 10 October 2007.
Revised on: 30 December 2007.
Accepted on: 27 January 2008.
___________________Journal of Rock Mechanics and Geotechnical Engineering
Submitted on: 01 January 2015.
Revised on: 18 April 2015.
Accepted on: 10 June 2015.
___________________Journal of Rock Mechanics and Geotechnical Engineering
Submitted on: 18 August 2013.
Revised on: 04 October 2013.
Accepted on: 27 October 2013.
___________________Journal of Rock Mechanics and Geotechnical Engineering
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