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Sneak peek 📢 ! Check out our contribution to the Special Issue of Ocean Engineering: "State of Practice – Geotechnical Considerations for Offshore Wind" in the link below (limited free access until April 19th).

The paper presents the results of 3D coupled cyclic time history numerical analyses of a monopile supporting a 12 MW Offshore Wind Turbine, installed in dense cohesionless soils and subjected to a 600-s load history corresponding to the high phase of a 35-h design storm. The goal of the study is to investigate the governing mechanisms and gauge potential conservatisms or uncertainties in approaches for monopile analysis used in practice. The Ta-Ger constitutive model, implemented in FLAC3D and calibrated against site-specific cyclic tests, is used to model the complex soil response. Emphasis is placed on the effect of drainage conditions, an aspect typically overlooked in practice, although often stated as critical. Analyses show that the drainage of the system can substantially affect the response. In low-permeability soils (e.g., cohesionless soils with low-plasticity fines) widespread liquefaction may occur inducing high rotations above allowable limits. On the contrary, systems that can drain effectively within each cycle, develop moderate excess pore pressures which do not jeopardize performance. Current design procedures are often unable to accurately capture these effects possibly leading to either conservative or unconservative outcomes. Suitably validated advanced numerical analyses can be used as complementary tools to standard methods to assess these uncertainties.


Our team will be participating in the 9th International Offshore Site Investigation and Geotechnics (OSIG 2023) that will take place from 12-14 September 2023 at Imperial College in London with 5 papers!

  • V.A. Drosos, P. Tasiopoulou, A. Giannakou, J. Chacko, C. T’Joen, D. Papadopoulos, S. de Wit and R. Fearon. "Dynamic Numerical Evaluations of Slope Movement-Induced Demands on Pile-Supported Jetty and Offshore Pipeline for an Import LNG Terminal"

  • Y.K. Chaloulos, P. Tasiopoulou, A. Giannakou and J. Chacko. "3D numerical simulations of centrifuge tests measuring suction bucket capacity in sand under different pullout rates"

  • P. Tasiopoulou, Y. Chaloulos, C. Tsifis, A. Giannakou, J. Chacko, M. Harte and T. Balaam. "Evaluation of stress-induced anisotropy effects on undrained monotonic capacity of suction bucket foundations in cohesionless soils using Ta-Ger constitutive model"

  • P. Tasiopoulou, T. Limnaiou, Y. Chaloulos, A. Giannakou and J. Chacko. "Time-history Effective-stress Analyses of OWT Suction Bucket Foundation in Sand under Sustained Tension Typhoon Loading"

  • D. Delavinia, E. Kementzetzidis, S. Panagoulias A. Tsouvalas and F. Pisanò. "Seismic soil-monopile-structure interaction for offshore wind turbines: from 3D to 1D modelling"

See you there!


Two brand new journal papers by GR8 GEO team have just come out!

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