Evaluation of the available SPT-CPT correlations for the liquefaction assessment of offshore wind farm in APAC

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4. Evaluation of the available SPT-CPT correlations for the liquefaction assessment of offshore wind farm in APAC

The development of offshore wind parks in Japan is rapidly growing, necessitating more robust and standardized approaches for foundation design. A crucial aspect of foundation design is the assessment of liquefaction potential and site response analysis. This assessment can be conducted using both Standard Penetration Test (SPT) and Cone Penetration Test (CPT) correlations. Building guidelines permit the use of both methods for liquefaction assessment, though SPT based methods have been more commonly used historically in Japan for onshore structures. Considering offshore wind, conducting SPT tests offshore is complex, costly, and presents significant challenges. A common approach is to convert CPT results to SPT values using available correlations, such as those proposed by Suzuki et al. (2003). Nevertheless, uncertainties arise with this approach when soil conditions differ from those in the database used to develop these correlations. This paper addresses these challenges by evaluating the available SPT-CPT correlations using real data collected offshore in APAC, which comprises clays, silts, sands and gravel. The performance of different methods for liquefaction assessment will be compared and discussed.

5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)

1 - Site investigation strategies, geohazards and integrated studies