NGUT: Recent submissions

  • Implementation of subloading constitutive models in Material Point Methods 
    Pereira, C. (2016)
    This document describes the work developed in the short term scientific mission, STSM, of the COST TU1202, entitled Implementation of subloading constitutive models in material point methods, hosted by Dr. Phil Vardon, in ...
  • Test conditions influence on thermal conductivity and contact conductance of sand at transient state 
    Aljundi, K.; Pereira, C.; Vieira, A.; Maranha, J. R.; Lapa, J.; Cardoso, R. (Elsevier, 2024)
    The proper assessment of soil thermal properties, such as thermal conductivity, assumes a particular relevance for the design of Ground Source Heat Pump systems, as it determines the heat transfer and the energy efficiency ...
  • The practice of testing ground nails 
    Carvalho, M. R. (Proceedings of the XVIII ECSMGE 2024, 2024-08-27)
    The soil nailing construction technique is often used to stabilise a ground mass by installing reinforcing elements (nails). The European Standard EN 14490:2010 defines general principles for execution, supervision, testing ...
  • Métodos de ensaio para verificação da carga instalada em ancoragens de serviço 
    Carvalho, M. R.; Juvêncio, E. (18CNG, 2023-05-14)
    As ancoragens no terreno em estruturas de contenção, apresentam-se como “obras vivas”, carecendo de inspeção e de manutenção periódicas. A carga nas ancoragens pode variar com o tempo, nomeadamente para valores inferiores ...
  • Geotechnical characterization of a novel material obtained by injecting a closed cell expansive polyurethane resin into a sand mass 
    Miranda, L.; Caldeira, L.; Bilé Serra, J.; Gomes, R.C. (Elsevier, 2023-06-21)
    This paper reports the findings of experimental studies on a novel application of a closed cell expansive polyurethane resin injection into a sand mass, regarding some common engineering properties. Previous papers on ...
  • Análise distorcional de solos aluvionares lodosos 
    Carvalho, M. R. (1998-01)
  • Estudo da condutividade térmica dos solos em Lisboa 
    Vieira, A.; Pinto, C.; Aljundi, K.; Miguel, I.; Almeida, I. M.; Pereira, C. (Sociedade Portuguesa de Geotecnia, 2023-05)
    O projeto de investigação GeoSustained, financiado pela Fundação Portuguesa para a Ciência e a Tecnologia (FCT, PTDC/ECI-CON/1866/2021), visa estudar soluções sustentáveis utilizando sistemas geotérmicos superficiais para ...
  • Numerical modelling of slope–vegetation–atmosphere interaction: an overview 
    Elia, C.; Cotecchia, F.; Pedone, G.; Vaunat, J.; Vardon, P.; Pereira, C.; Springman, S. M.; Rouainia, M.; Esch, J.; Koda, E.; Josifovski, J.; Nocilla, A.; Askarinejad, A.; Stirling, R.; Helm, P.; Lollino, P.; Osinski, P. (Lyell Collection - Geological Society Publications, 2017-04)
    The behaviour of natural and artificial slopes is controlled by their thermo-hydro-mechanical conditions and by soil–vegetation–atmosphere interaction. Porewater pressure changes within a slope related to variable ...
  • Shallow Foundation Design through Probabilistic and Deterministic Methods 
    Pereira, C.; Caldeira, L. (ISGSR 2011 - Vogt, Schuppener, Straub & Bräu (eds) - © 2011 Bundesanstalt für Wasserbau, 2011)
    The design of a shallow foundation with eccentric loading is presented for the ultimate limit state of the bearing resistance, according to the formulation presented in annex D of NP EN 1997-1:2010. Probabilistic and ...
  • Analysis of the influence of suction on shear strength 
    Pereira, C.; Caldeira, L.; Salgado, F. M. (Young Geotechnical Prize in English Language, XIII Congresso Nacional de Geotecnia, 2012-04)
    The Barcelona Basic Model, BBM, is one of the most used elasto-plastic models for unsaturated soils. A briefly presentation of the BBM is made and some aspects are discussed. Its mathematical formulation is summarily ...
  • Simulation of the physical degradation of natural slopes of Jurassic marls when excavated and subjected to suctions changes 
    Pereira, C.; Cardoso, R.; Caldeira, L.; Maranha das Neves, E. (The Mediterranean Workshop on Landslides, Naples (extended abstract)., 2013)
    Soft clayey rocks such as marls and argillites are very common in the Iberian Peninsula. Design provisions for engineering works such as slope excavation in these materials must consider their evolving behaviour. Evolution ...
  • Application of Genetic Algorithms with Hill Climbing Procedure to a Constitutive Model for Hard Soils and Soft Rocks 
    Pereira, C.; Caldeira, L.; Maranha, J. R. (18th International Conference on Soil Mechanics and Geotechnical Engineering, 2013)
    For engineering applications, the complex behaviour of hard soils / soft rocks can be modelled using advanced constitutive models, although they require a great number of parameters. The application of Genetic Algorithms ...
  • A viscoplastic subloading overstress model with a moving centre of homothety 
    Maranha, J. R.; Pereira, C.; Vieira, A. (The 14th International Conference of the International Association for Computer Methods and Advances in Geomechanics, 2014)
    This paper presents a viscoplastic overstress soil model that incorporates the subloading surface concept with a moving centre of homothety. The model is formulated to represent the soil rate dependent behaviour under ...
  • Numerical analysis of the construction of Odelouca Dam using a Subloading Surface Soil Model 
    Brito, A.; Maranha, J. R.; Caldeira, L.; Pereira, C. (8th European Conference on Numerical Methods in Geotechnical Engineering,, 2014)
    Odelouca dam is an embankment dam, with 76 m height, recently constructed in the south of Portugal. It is zoned with a core consisting of colluvial and residual schist soil, and with soil-rockfill mixtures making up the ...
  • Advanced constitutive model calibration using genetic algorithms: some aspects 
    Pereira, C.; Maranha, J. R.; Brito, A. (8th European Conference on Numerical Methods in Geotechnical Engineering,, 2014)
    The complex nature of soil behaviour can only be modelled by advanced constitutive models. This type of models has the disadvantage of requiring a great number of parameters (material model constants and internal variables ...
  • Viscoplastic subloading modelling of strain rate change effects in London clay 
    Maranha, J. R.; Pereira, C.; Vieira, A. (International Conference on Creep and Deformation Characteristics in Geomaterials., 2015)
    This paper illustrates the capability of a new viscoplastic subloading model to reproduce the strain rate change effects. The viscoplastic subloading model used is based on the subloading surface concept with a mobile ...
  • Thermo-viscoplastic subloading soil model for isotropic stress and strain conditions. 
    Maranha, J. R.; Pereira, C.; Vieira, A. (International Workshop on Advances in Laboratory Testing and Modelling of Soils and Shales, Villars-sur-Ollon, 2017)
    This paper presents a thermo-viscoplastic subloading soil model with a mobile centre of homothety. The model is formulated to describe the influ-ence of non-isothermal conditions on the stress-strain-time behaviour of soils ...
  • The role of evolutionary algorithms in soil constitutive models 
    Pereira, C.; Maranha, J. R. (9th European Conference on Numerical Methods in Geotechnical Engineering, 2018)
    The complex nature of soil behaviour must be modelled with advanced constitutive models. However, some difficulties can be highlighted that hinder the use and the development of advanced constitutive soil models in ...
  • DEM analysis of some effects due to capillary forces in sands 
    Pereira, C.; Maranha, J. R.; Cardoso, R. (E-Unsat 2020 (publicação online), 2020)
    In this paper, the Discrete Element Method is used to study the e ect of capillary forces, in equilibrium with the ambient relative humidity, on the response of irregular arrangements of equal-sized spheres, simulating a ...
  • A general mathematical framework for modelling soil-water retention behaviour 
    Pereira, C.; Maranha, J.; Cardoso, R. (3rd Pan-American Conference on Unsaturated Soils, 2021)
    A new constitutive model to reproduce the soil-water retention behaviour of unsaturated soils is proposed, able to reproduce the main drying and wetting paths, the cyclic retention behaviour and its dependence on the ...

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