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• Conference paper
  Maddah Sadatieh MS, Tsiampousi A, Paschalis A, 2025,

  Numerical Analysis of Soil-Plant-Atmosphere Interaction

  , The 4th PANAM UNSAT conference in June 2025
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• Conference paper
  Sanchez Fernandez J, Provost A, Ruiz Lopez A, Taborda Det al., 2025,

  A data-driven approach to predicting the long-term thermal performance of thermo-active piles

  , 3rd International Conference on Energy Geotechnics

  The analysis and optimisation of large ground source energy systems involving the use of thermo-active piles requires the ability to predict the thermal performance of these geothermal structures using limited computational resources, as many different configurations need to be tested. Current design methods are either based on empirical expressions, the accuracy of which is necessarily limited, or on thermo-hydraulic modelling which is computationally expensive and hence of difficult integration with optimisation procedures. In this paper, a surrogate model of a single thermo-active pile is established by running multiple thermo-hydraulic finite element analyses using different combinations of thermal ground properties, pipe arrangement, fluid temperature, pile length and pile diameter determined using a Latin hypercube sampling approach. The database of results is then used to train an artificial neural network (ANN), which is shown to produce accurate predictions of the thermal performance of a thermo-active pile given its characteristics and those of the surrounding ground. Given the low computational cost of surrogate models, this approach enables the design optimisation of large systems with greater confidence than previously possible using empirical relationships and a fraction of the resources required by thermo-hydraulic finite element models.

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• Conference paper
  Provost A, Sanchez Fernandez J, Sapin P, Taborda Det al., 2025,

  An approach for including heat pump performance in the design of thermo-active piles

  , 3rd International Conference on Energy Geotechnics, Publisher: ISSMGE

  The focus on sustainable built environment has grown with the drive for net-zero. The use of pile foundations and other geotechnical structures as ground heat exchangers (GHEs) is key to unlocking the economic viability of ground-source energy systems (GSESs) in dense urban areas. However, current design procedures characterise the performance of GHEs under a given temperature or heat flux, which consider the heat exchanger in isolation from the rest of the GSES. This study proposes a new method to assess the thermal performance of GHEs based on the electricity consumption of the heat pump byintroducing explicitly a model describing its performance based on operating temperatures. This general method is applied to a thermo-active pile, providing insights into the impact of pile diameter and length

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• Conference paper
  Beh M, Liu R, Taborda D, Al-Tabbaa Aet al., 2025,

  Numerical Modelling of Ground Improvement Thermal Parameters for Long-Term Energy Pile Performance

  , 3rd International Conference on Energy Geotechnics
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• Conference paper
  Tantivangphaisal P, Ortiz Wall F, Taborda D, Machacek J, Liaudat J, Zachert Het al., 2025,
  , 5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025), Publisher: International Society for Soil Mechanics and Geotechnical Engineering, Pages: 1533-1538

  Many geotechnical structures rely on piles or pile groups for foundation, both onshore and offshore. Predicting their load-deformation behaviour remains a significant challenge, particularly for cyclically loaded piles. The rapid expansion of offshore wind energy necessitates accurate predictions of pile behaviour under complex loading conditions induced by metocean factors, including severe cyclic lateral loading. Examples of such piles in offshore conditions include monopile foundations and anchor piles for floating offshore wind turbines. To assess the state of the art and current practices, an international benchmarking exercise was conducted within the framework of the GEOLAB project.This exercise invited both practicing engineers and researchers to participate in a contest by submitting their predictions on the outcomes of two large-scale physical model tests on a laterally loaded pile. In the first test, a monotonically increasing lateral load was applied until a lateral displacement of up to 20% of the pile diameter was achieved. In the second test, a total of 13,000 sinusoidal lateral loading cycles were applied, divided into two packages with different mean values and amplitudes. This paper describes the methods followed by the winning team that showed the best overall performance in both monotonic and cyclic loading.

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• Conference paper
  Tantivangphaisal P, Taborda D, Kontoe S, Schroeder F, Grammatikopoulou Aet al., 2025,
  , 5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025), Publisher: International Society for Soil Mechanics and Geotechnical Engineering, Pages: 1423-1428

  The geotechnical design of laterally loaded offshore wind turbine monopile foundations usually has two main requirements: 1) design load cases must not exceed the total lateral pile resistance calculated with material partialfactors and 2) a limit on pile head deformation and rotation under critical load cases. When resolving and translating load combinations into geotechnical design loads on the foundation, the effect of loads on the turbine structure acting in multiple directions at varying moment arms is often neglected. For ULS design, a maximum load case prescribed to act at a single moment arm is typically assumed as the most onerous static load case. This is done without consideration of the fact that the pile capacity is dependent on the assumed lever arm and without full definition of the limit state envelope. Three-dimensionalfinite element analyses are well placed to evaluate limit state envelopes so that combinations of load magnitudes, directions and moment arms can be jointly considered. This paper presents a design workflow using a parametric numerical study on a typical monopile founded in sands of different densities to jointly consider these factors. The evaluated response envelopes are proposed as a more rigorous evaluation of geotechnical design limit states and can be adopted in conjunction with a probabilistic treatment of magnitude, height and direction of environmental loads.

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• Journal article
  Tantivangphaisal P, Taborda D, Kontoe S, 2025,
  , MethodsX, Vol: 14, ISSN: 2215-0161

  A modification of the high-cycle accumulation (HCA) framework coupled with a practical constitutive model for sands and its numerical implementation as a user-defined soil model in PLAXIS is presented. The implemented model is compared against data from the original high-cyclic tests in Karlsruhe fine sand and more recent laboratory tests in Dunkirk sand. A reference 15 MW offshore wind turbine monopile foundation subject to lateral cyclic wave loading is used in an engineering design scenario at three different load levels to verify the current numerical implementation.Details include:• Modifications made to the HCA framework to couple it with a practical sand constitutive model,• Implementation of an efficient workflow to switch between low and high cycle constitutive equations in PLAXIS, and• Verification of the implementation at single element and boundary value problem scales.

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• Conference paper
  Yang Y, Ruiz Lopez A, Tsiampousi K, Taborda Det al., 2025,

  A model-independent adaptive sampling approach for surrogate design in geotechnical engineering

  , Digital Twins in Engineering & Artificial Intelligence and Computational Methods in Applied Science
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• Journal article
  Tsiampousi A, 2025,
  , Canadian Geotechnical Journal, Vol: 62, Pages: 1-16, ISSN: 0008-3674

  Infrastructure slopes often become covered in dense vegetation due to poor vegetation management. Despite increasing cohesion and enhancing slope stability, trees lead to serviceability problems, primarily towards the end of the summer. Drastic approaches, however, such as vegetation clearance, have caused instabilities during wet seasons. Therefore, appropriate, effective, and continuous vegetation management is of essence and should consider both biodiversity and the engineering asset, while accounting for the contribution of vegetation in battling climate change. Developing numerical methodologies and models can be particularly useful in acquiring insight into the complex mechanism and processes taking place during slope-plant-atmosphere interactions. The work presented here focused on the development of a 3D numerical model to investigate different vegetation management strategies for a slope covered in trees and suffering serviceability problems. Different 3D patterns of tree removal and of replacement of trees with shrubs were considered and the effect of each of these on the serviceability and stability of the slope during the subsequent year was examined. The results demonstrated that replacement was preferable to removal, as stability and serviceability should be considered concurrently, and that, occasionally, clearance may have detrimental effects non only on stability but also on serviceability.

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• Conference paper
  Sanchez Fernandez J, Ruiz Lopez A, Taborda D, 2024,

  Integrating machine learning classification with thermal integrity profiling for concrete pile assessment

  , DTE AICOMAS 2025
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• Conference paper
  Tantivangphaisal P, Taborda D, Kontoe S, 2024,
  , XVIII European Conference on Soil Mechanics and Geotechnical Engineering, Publisher: CRC Press, Pages: 3349-3352

  There is growing interest to utilise advanced numerical methods by industry practitioners in the predictionof the long-term response of monopile foundations under lateral cyclic loading. One framework of interest is the HighCycle Accumulation (HCA), as it can overcome the limitations of computational expense and error accumulationencountered by conventional cycle-by-cycle finite element analyses. The authors’ implementation of HCA within thefinite element package PLAXIS is presented with an emphasis on the framework’s key components and underlying assumptions. Furthermore, by coupling HCA with a practice oriented elasto-plastic model for sands, predictions using different HCA calibration approaches are evaluated against the field measurements of a medium sized cyclic lateral pile load test from the Pile-soil analysis (PISA) joint industry project.

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• Conference paper
  Liu J, Tsiampousi A, Ruiz Lopez A, Taborda Det al., 2024,
  , XVIII European Conference on Soil Mechanics and Geotechnical Engineering, Publisher: CRC Press, Pages: 614-617
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• Journal article
  Liu R, Taborda D, 2024,
  , Geomechanics for Energy and the Environment, Vol: 39, ISSN: 2352-3808

  This paper introduces innovative practical methodologies for evaluating the thermal performance of thermo-active pile groups. First, a streamlined approach for determining G-functions within such groups, based on the G-function of a single thermo-active pile is introduced. This is accomplished through a newly introduced thermal interaction factor for G-functions quantifying the increase in temperature when a pile is subjected to thermal interference from another pile. Subsequently, the paper proposes a method for calculating the power of piles within thermo-active pile groups when subjected to transient inlet temperatures. A thermal interaction factor for power is derived, quantifying the power reduction resulting from thermal interference due to another pile operating in the vicinity. These simplified methodologies are shown to reproduce the thermal performance of pile groups simulated using three-dimensional thermo-hydraulic analyses with excellent levels of accuracy without the associated computational cost. Finally, the proposed design process is applied to a 3 × 3 thermo-active pile group subjected to transient thermal loads, yielding accurate estimations of power, G-functions, and temperature changes of the thermo-active pile group. Overall, these simplified methodologies offer a robust framework for evaluating and optimising the thermal performance of thermo-active pile systems.

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• Conference paper
  Taborda D, Tsiampousi A, Georgiadis K, 2024,
  , XVIII European Conference on Soil Mechanics and Geotechnical Engineering
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• Conference paper
  Ruiz Lopez A, Taborda D, Tsiampousi A, Pedro AMG, Hardy Set al., 2024,
  , XVIII European Conference on Soil Mechanics and Geotechnical Engineering
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