GR8 GEO in OSIG 2023

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!

2 NEW journal publications on Geotechnical Earthquake Engineering

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

Blind predictions of LEAP 2020 centrifuge tests of a sheet-pile wall with liquefiable backfill

Panagiota Tasiopoulou, Yannis Chaloulos, Amalia Giannakou and Jacob Chacko have co-authored a paper titled: “Seismic performance of sheet-pile wall supporting liquefiable backfill: Blind predictions of centrifuge model tests using Ta-Ger constitutive model” which has been published in Soil Dynamics and Earthquake Engineering. In this paper, blind numerical simulations of seven centrifuge tests with “identical” models of a sheet-pile wall supporting medium dense liquefiable backfill and subjected to seismic excitation were performed as part of the LEAP 2020 project. The analyses were conducted with FLAC using the Ta-Ger soil constitutive model. The Ta-Ger model parameters were calibrated against available laboratory DSS data on Ottawa sand with similar relative density with a focus on capturing at an element level: i) the liquefaction triggering resistance, ii) the post-liquefaction rate of shear-strain accumulation, iii) overburden effects on liquefaction triggering resistance and iv) realistic shear stress-strain responses. A single numerical model was built in prototype scale and analyses were performed by only varying the input seismic motion recorded at the base of each of seven centrifuge tests.

Comparisons of numerical predictions with measured centrifuge test responses indicate that the analyses successfully capture the primary mechanisms of the system response. These included liquefaction in the free-field and development of negative pore pressures behind the wall, with accurate predictions of outward wall displacement for the majority of the tests. Most centrifuge tests and numerical predictions consistently exhibit a systematic linear trend of increase in wall displacements with spectral acceleration at the predominant frequency of the system. The numerical analyses overpredicted wall displacements only for centrifuge tests not following this trend, indicating that the variations maybe due to experimental variations from their specifications that were not considered in the blind predictions.

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