콘관입시험 결과를 이용한 지반특성값 산정방법에 따른 해상풍력발전기 모노파일의 설계

Abstract

Different approaches to estimation of the characteristic undrained shear strength of soil are discussed, based on 12 cone penetration tests (CPTs) carried out within a soil volume representative for an offshore monopile foundation. The paper is focussed on the statistical treatment of the data, and pile&#8211 soil interaction is modelled by the Winkler approach with non-linear p&#8211 y curves for the soil resistance. The 5-MW NREL reference wind turbine is employed for loadestimation, utilizing the aeroelastic code, FAST. The study includes comparison of monopile capacities based on a single CPT as well as multiple CPTs. Comparisons are made between results obtained from a single CPT and those from all the CPTs at the site. The influence of assuming few or many layers in the deter&not ministic soil model is assessed, and different assumptions regarding the statistical distribution of the data are compared. Finally, based on find&not ings of the analyses, guidelines for the estimation of the characteristic soil strengths are proposed.r is focussed on the statistical treatment of the data, and pile&#8211 soil interaction is modelled by the Winkler approach with non-linear p&#8211 y curves for the soil resistance. The 5-MW NREL reference wind turbine is employed for loadestimation, utilizing the aeroelastic code, FAST. The study includes comparison of monopile capacities based on a single CPT as well as multiple CPTs. Comparisons are made between results obtained from a single CPT and those from all the CPTs at the site. The influence of assuming few or many layers in the deter&not ministic soil model is assessed, and different assumptions regarding the statistical distribution of the data are compared. Finally, based on find&not ings of the analyses, guidelines for the estimation of the characteristic soil strengths are proposed.