A framework for the design of vertically loaded piles in spatially variable soil

Abstract Each pile in an offshore wind farm may be designed solely on the results of a single cone penetration test (CPT) positioned at its center or based sample statistics calculated from multiple investigated locations same geotechnical unit. This study investigates quantitatively effects spatial variability soil efficacy two approaches to achieve reliable design. Random field theory is used generate sets tip resistance profiles with different characteristics represent seabed conditions and piles are ‘designed’ using above partial factor method withstand given vertical drained design load distribution. The inaccuracies prediction capacity CPT data quantified terms scatter reliability (or probability failure). Outputs parametric statistical analysis demonstrate that ability CPT-based produce foundation dependent ratio between horizontal scale fluctuation diameter, overall (coefficient variation) properties. Modifications deterministic, suggested account for these uncertainties ensure target reliabilities achieved.