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by Ed Ellis: Lecturer, University of Plymouth; formerly University of Nottingham Raveed Aslam: Geotechnical Engineer, Faber Maunsell Ltd; formerly University of Nottingham. This paper was first published in GE’s July 2009 issue. This paper is a continuation of Part 1 published in the June 2009 issue of GE. Figure and equation numbers continue from Part 1 of this paper.