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• Conference paper
  Kontoe S, Moller J, Taborda D, 2024,

  Seismic response of offshore foundations with emphasis in liquefiable ground conditions

  , 8th International Conference on Earthquake Geotechnical Engineering

  Following the rapid expansion of offshore wind farms in seismic areas, this study examines the hurdles encountered when applying conventional seismic evaluation methods, originally devised for onshore structures, to offshore installations. This includes the assessment of liquefaction offshore at large depths and its consequences on the response of offshore wind turbines supported by monopile foundations. With the aid of 3D dynamic finite element analysis of the entire SSI system (tower, monopile foundation and soil domain), it is shown that the resonant frequencies of the examined 5MW turbine were excited for the considered ground motion, inducing significant nonlinearity in the soil surrounding the monopile foundation. The vertical seismic motion, often overlooked in seismic design, is also discussed as it bears significance for the response of offshore wind turbines. Simple site response analysis for vertical ground motion emphasizes the need to consider the entire water column and soil profile depth to the bedrock for an accurate representation of the soil-water system's compression natural frequency in offshore environments.

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• Journal article
  Tsiampousi A, Day MC, Petalas A, 2024,

  Engineering soil barriers to minimise annual shrinkage/swelling in plastic clays

  , Geomechanics for Energy and the Environment, Vol: 38, ISSN: 2352-3808

  Engineered soil barriers have been proposed to prevent rainwater infiltration into the underlying soil, thus improving stability of sloping ground. The use of engineered barriers on flat ground as means of preventing flooding has also been explored. This paper aims to provide proof-of-concept as to the potential efficiency of engineered barriers in minimising soil shrinkage and swelling arising from seasonal variations of water content and pore water pressures within the ground due to its interaction with the atmosphere. A series of 2-dimensional, hydro-mechanically coupled finite element analyses were conducted to this effect. Emphasis was placed on accurately modelling the stiffness of the underlying soil, accounting for its small-strain behaviour, as well as the hydraulic behaviour of all the layers involved. The results confirm that it is possible to engineer barriers to minimise shrinkage/swelling in greenfield, as well as urban, conditions and highlight the influence of barrier geometry and configuration, so that recommendations for the design of such barriers can be made.

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• Journal article
  Liu RYW, Taborda DMG, 2023,

  A simplified methodology for determining the thermal performance of thermo-active piles

  , ENVIRONMENTAL GEOTECHNICS, ISSN: 2051-803X
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• Conference paper
  Moller JK, Kontoe S, Taborda D, 2023,

  Combination of kinematic and inertial loads acting on monopile foundations for offshore wind turbines

  , Symposium on Energy Geotechnics 2023
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• Conference paper
  Kontoe S, Jardine R, Möller J-K, Taborda Det al., 2023,

  Dynamic response of offshore foundations – from pile installation to seismic performance

  , SECED 2023: Earthquake Engineering & Dynamics for a Sustainable Future, Publisher: Society for Earthquake and Civil Engineering Dynamics, Pages: 1-12

  Dynamic analysis has an important role to play in the rapid expansion of offshore windinstallations worldwide, as it affects multiple design stages. This paper highlights the use ofdynamic analysis in two distinct aspects of offshore geotechnics. It first gives examples fromrecent Joint Industry Projects where consistent procedures for wave propagation analysis basedon impact pile driving and restrike data were established, ultimately resulting in the developmentof more reliable tools for the assessment of axial capacity of piles supporting jacket structures.Following the rapid expansion of offshore wind farms in seismic areas, the second part of thepaper discusses some of the challenges in transferring some of the existing seismic assessmentprocedures, which were established for conventional onshore structures, to offshore structures.This includes the assessment of liquefaction offshore at large depths and its consequences onthe response of offshore wind turbines supported by monopile foundations.

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• Conference paper
  Kumar R, Taborda DMG, Kontoe S, Cheng Set al., 2023,

  Serviceability assessment of offshore wind foundation under monotonic loading using data assimilation techniques

  , Innovative Geotechnologies for Energy Transition, Publisher: Society of Underwater Technology
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• Conference paper
  Pirrone AI, Taborda DMG, 2023,

  An application of machine learning to the back analysis of monopile response

  , Innovative Geotechnologies for Energy Transition, Publisher: Society of Underwater Technology
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• Conference paper
  Tantivangphaisal P, Taborda DMG, Kontoe S, 2023,

  Sensitivity of 3D FE monopile pushover analyses to natural variance observed in ground characterisation

  , Innovative Geotechnologies for Energy Transition, Publisher: Society of Underwater Technology
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• Conference paper
  Ma S, Kontoe S, Taborda D, 2023,

  On the impact of soil permeability in the numerical simulation of seismically induced liquefaction

  , 10th European Conference on Numerical Methods in Geotechnical Engineering, Publisher: International Society for Soil Mechanics and Geotechnical Engineering
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• Conference paper
  Moller JK, Kontoe S, Taborda D, 2023,

  Numerical investigation of energy dissipation in liquefiable soil deposits

  , SECED 2023 Conference
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• Conference paper
  Tsiampousi A, 2023,

  The importance of permeability in modelling soil-atmosphere interaction

  , 8th International Conference on Unsaturated Soils (UNSAT 2023), Publisher: EDP Sciences, ISSN: 2267-1242

  Soil-atmosphere interaction has been attracting increasing interest as the seasonal variation of pore water pressures (pwp) has been linked to a variety of geotechnical problems (e.g. slope stability and serviceability, foundation subsidence or swelling, desiccation cracking etc.) or has been identified as part of the solution of geotechnical problems (e.g. in sustainable urban drainage systems). Prediction of how the pwp will change within soils of low permeability under the combined effect of evapotranspiration and precipitation requires adequate knowledge of the soil permeability and how it varies spatially (e.g with depth) and temporally (e.g. with suction or degree of saturation, void ratio or due to the opening and closing of desiccation cracks). Nonetheless, in-situ measurements of permeability that satisfy both the spatial and temporal variation are difficult. In order to clarify the importance of variable permeability in predicting pwp variations under atmospheric loads, a series of one- and two-dimensional finite element analyses was performed, where the permeability model and the variation of permeability were parametrically studied. The results demonstrated that the variation of permeability, as well as the model employed in the analysis, e.g. allowing or not for desiccation cracking, influenced the values of suction calculated as well as the pwp profile with depth, highlighting the importance of estimating the spatial and temporal variation of permeability with some level of confidence.

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• Conference paper
  Tsiampousi A, 2023,

  3D effects of soil-atmosphere interaction on infrastructure slope stability

  , 8th International Conference on Unsaturated Soils, Publisher: EDP Sciences, ISSN: 2267-1242

  It has long been established that pore water pressure (pwp) variations affect the stability and serviceability of slopes. Pwp variations may be due to consolidation/swelling processes within soils of low permeability or may be due to seasonal evapotranspiration and precipitation processes. The simultaneous study of such phenomena and of hydro-mechanical coupling in sloping ground requires use of advancednumerical methods. Often, infrastructure slopes are considered in plane strain (two-dimensional) conditions for simplicity and to date this is the case for most numerical analyses considering soil-atmosphere interaction. However, this approach makes it impossible to study the longitudinal extent of a possible slip surface forming following vegetation removal. Three-dimensional, fully-coupled numerical analyses of acut slope were performed herein to study the effect of vegetation clearance on stability and explore numerically ways of implementing effective vegetation management.

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