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• Conference paper
  Ferrero J, Ruiz Lopez A, Taborda D, Brasile Set al., 2023,

  Applying the observational method to a deep braced excavation using an artificial neural network

  , 10th European Conference on Numerical Methods in 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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• Journal article
  Taborda D, Goncalves Pedro A, Pirrone A, 2022,

  A state parameter-dependent constitutive model for sands based on the Mohr-Coulomb failure criterion

  , Computers and Geotechnics, Vol: 148, ISSN: 0266-352X

  Experimental data have demonstrated that a strong relationship exists between the state parameter and the peak strength and dilatancy characteristics of sands. This paper proposes a way of reproducing this behaviour using a modified Mohr-Coulomb failure criterion, which retains its simplicity while improving substantially its modelling capabilities. The formulated constitutive model is calibrated for Nevada sand following a well-defined procedure and used in the prediction of four centrifuge tests investigating the behaviour of axially loaded footings. It is shown that the proposed model reproduces well both the element tests and the morecomplex footing problems, demonstrating its usefulness for engineering practice. Moreover, a simplified version which does not require the definition of the Critical State Line is proposed for situations when this aspect of soil behaviour cannot be determined with confidence. It is shown that such simplification results in only slightly less accurate predictions than the full version of the model, while simulating aspects of soil response that cannot be reproduced using constant values for strength and dilatancy parameters.

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• Conference paper
  Morales C, Taborda D, 2022,

  A review of the hydro-mechanical behaviour of tailings and its importance to the stability of tailings dams

  , 7th International Young Geotechnical Engineers Conference, Publisher: International Society for Soil Mechanics and Geotechnical Engineering, Pages: 605-610

  Seepage in tailings storage facilities (TSFs) is commonly assumed to occur under gravity flow and is usuallydetermined for steady-state conditions. However, the stability of TSFs is highly influenced by the degree of saturation of the materials involved in these structures. Several of these structures are in areas where the climate conditions are characterised by alternating (very) dry and (very) wet seasons, which presents additional challenges in terms of soil-atmosphere interaction. This paper presentsa review of the parameters that influence the phreatic surface within the TSF under steady-state conditions and assesses by a numerical analysis of how this behaviour changes under transient conditions. For the modelling stage, a generic upstream dam setting is analysed using the limit equilibrium approach, where steady-state and transient seepage analyses are employed to assess the mostinfluencing parameters on the dam's stability. Specifically, the hydraulic boundary conditions, the length, anisotropy and uniformity of the beach, and the effect of considering the drying or wetting path of the soil-water characteristic curve, are assessed to determine the degree of influence of these parameters on the stability of the dam.

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• Journal article
  Liu R, Taborda D, Fisher A, Bourne-Webb PJet al., 2021,

  Development of a practical heat of hydration model for concrete curing for geotechnical applications

  , Geotechnical Research, Vol: 9, ISSN: 2052-6156

  Thermal integrity profiling (TIP) is a common non-destructive technique to evaluate the quality of construction of piles by analysing the temperature fields due to heat of hydration from freshly cast concrete piles. For this process to be accurate, a reliable concrete heat of hydration model is required. This paper proposes a practical and simple to calibrate four parameter model for the prediction of concrete heat of hydration. This model has been shown to be able to reproduce the evolution of heat of hydration measured in laboratory tests, as well as field measurements of temperature within curing concrete piles, as part of a thermal integrity profiling (TIP) operation performed at a site in London. With the simplicity of the model and the small number of model parameters involved, this model can be easily and quickly calibrated, enabling quick predictions of expected temperatures for subsequent casts using the same concrete mix.

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