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Submitted on: 05 November 2014.
Revised on: 09 February 2015.
Accepted on: 26 March 2015.
___________________Geotechnique Letters---EMERALD GROUP PUBLISHING LTD
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Submitted on: 28 November 2007.
Revised on: 15 March 2008.
Accepted on: 27 April 2008.
___________________Geotechnique Letters---EMERALD GROUP PUBLISHING LTD
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