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Submitted on: 23 May 2011.
Revised on: 26 July 2011.
Accepted on: 17 September 2011.
___________________Geotechnical Research---EMERALD GROUP PUBLISHING LTD
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Submitted on: 31 May 2012.
Revised on: 26 August 2012.
Accepted on: 21 October 2012.
___________________Geotechnical Research---EMERALD GROUP PUBLISHING LTD
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