Soil spatial variability at monopile scale

Offshore monopiles design requires the assessment of soil spatial variability within the foundation zone of influence. At wind farm scale, such assessment can be based on a site investigation strategy designed to include acquisition of geodata at nested location clusters. This paper presents geodata for three nested location clusters within the IJmuiden Ver Wind Farm Zone, offshore Netherlands. The geodata provide unprecedented detail on the site soil spatial variability for use in monopile foundations design. Each cluster covers a cylindrical soil volume with a diameter of 50 m and extending 50 m deep below seafloor. The primary geotechnical data set covers 17 CPTs with cone tip trajectories tracked below seafloor, with additional synthetic CPT profiles along two survey track lines of 2D UHR seismic lines. Secondary geotechnical data includes (1) shear-wave velocities derived from SCPTs and P-and-S suspension logging, (2) in situ soil density derived from downhole magnetic resonance measurements, and (3) laboratory test data.