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Ara es mostren els items 114-133 de 151

    • Salinity effects on the mechanical behaviour of methane hydrate bearing sediments: a DEM investigation 

      Jiang, Mingjing; Sun, Ruohan; Arroyo Alvarez de Toledo, Marcos; Du, Wenhao (Elsevier, 2021-05)
      Article
      Accés obert
      The stability of methane hydrate depends on not only temperature and pressure but also the salinity of the environment where the methane hydrate exists. The variation in the stability of methane hydrate due to the change ...

    • Sample quality examination on silty soils 

      Arroyo Alvarez de Toledo, Marcos; Pineda Jiménez, Jubert Andrés; Sau Valenzuela, Núria; Devincenzi, M.J.; Pérez, N. (Institution of Civil Engineers (ICE), 2015)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Mediterranean deltaic environments typically produce soil deposits in which silts dominate, granular intercalations are frequent and the mineralogy includes an important carbonate fraction. One question still open is what ...

    • SBPM testing in Bothkennar clay: structure effects 

      Arroyo Alvarez de Toledo, Marcos; González, Nubia Aurora; Butlanska, Joanna; Gens Solé, Antonio; Dalton, C (Taylor & Francis, 2008)
      Text en actes de congrés
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      A series of self-boring pressuremeter tests performed in Bothkennar clay are simulated using a finite element model of undrained cavity expansion. A bonded elasto plastic soil model is employed to represent Bothkennar clay ...

    • SDMT testing and its use in the numerical modelling of a deep excavation 

      Mariano, Alessandra di; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio; Amoroso, Sara; Monaco, Paola (Hungarian Geotechnical Society, 2021)
      Text en actes de congrés
      Accés obert
      The role of in situ tests in numerical analyses of deep excavations is investigated. The construction of a metro station in Barcelona required a deep excavation in a densely built urban area. Geological conditions were ...

    • SDMT-based numerical analyses of deep excavation in soft soil 

      Mariano, Alessandra di; Amoroso, Sara; Arroyo Alvarez de Toledo, Marcos; Monaco, Paola; Gens Solé, Antonio (2019-01)
      Article
      Accés restringit per política de l'editorial
      The paper explores the application of conventional (DMT) and seismic (SDMT) dilatometer tests to an important case of deep excavation design. The work presents finite-element analyses simulating a deep excavation close to ...

    • Sensitivity to damping in sand production DEM-CFD coupled simulations 

      Climent Pera, Natalia; Arroyo Alvarez de Toledo, Marcos; O'Sullivan, Catherine; Gens Solé, Antonio (American Institute of Physics Conference Proceeding, 2013)
      Text en actes de congrés
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      A three dimensional numerical model based on Discrete Element Method (DEM) and coupled with Computational Fluid Dynamics (CFD) was implemented to simulate sand production. Simulations with no fluid flow conditions and with ...

    • Shallow foundations for offshore wind towers 

      Arroyo Alvarez de Toledo, Marcos; Abadías, D.; Alcoverro, J.; Gens Solé, Antonio (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Direct foundations are present in about 25% of the installed offshore wind power towers. The peculiarities of this type of structure are well known: high dynamic sensitivity, complex couplings between environmental actions, ...

    • Simplifying calibration of bonded elasto-plastic models 

      Rios, Sara; Ciantia, Matteo Oryem; Gonzalez, Nubia Aurora; Arroyo Alvarez de Toledo, Marcos; Viana da Fonseca, A. (2016-03)
      Article
      Accés obert
      Using realistic constitutive models for artificially cemented soils is advantageous in design. However, the price of that increased realism is often a more elaborate model, which is difficult to calibrate. A database of ...

    • Simulación numérica de una excavación profunda mediante el empleo de ensayos dilatométricos 

      Mariano, Alessandra di; Amoroso, Sara; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio; Monaco, Paola (2022)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      La construcción de una estación de metro en Barcelona requirió la ejecución de una excavación profunda en un área densamente urbanizada. Las condiciones geológicas de la obra eran complicadas por la presencia de materiales ...

    • Simulation of cement-improved clay structures with a bonded elasto-plastic model: A practical approach 

      Arroyo Alvarez de Toledo, Marcos; Ciantia, Matteo Oryem; Castellanza, Riccardo; Gens Solé, Antonio; Nova, Roberto (2012-09)
      Article
      Accés restringit per política de l'editorial
      Engineering practice has usually dealt with the treated soil bodies using simplistic constitutive models (e.g. elastic perfectly-plastic Mohr–Coulomb). In this paper, a more refined bonded elasto-plastic model is here ...

    • Simulation of penetration problems in geomechanics 

      Gens Solé, Antonio; Arroyo Alvarez de Toledo, Marcos; Carbonell Puigbó, Josep Maria; Ciantia, Matteo Oryem; Monforte Vila, Lluís (CIMNE, 2017)
      Text en actes de congrés
      Accés obert
      The simulation of penetration problems in geomaterials is a challenging problem as it involves large deformations and displacements as well as strong non-linearities affecting material behaviour, geometry and contact ...

    • Simulation of penetration problems in geomechanics 

      Gens Solé, Antonio; Arroyo Alvarez de Toledo, Marcos; Carbonell Puigbó, Josep Maria; Ciantia, Matteo Oryem; Monforte Vila, Lluís (2017)
      Text en actes de congrés
      Accés obert
      The simulation of penetration problems in geomaterials is a challenging problem as it involves large deformations and displacements as well as strong non-linearities affecting material behaviour, geometry and contact ...

    • Simulation of the cone penetration test: discrete and continuum approaches 

      Gens Solé, Antonio; Arroyo Alvarez de Toledo, Marcos; Butlanska, Joanna; Monforte Vila, Lluís; Carbonell, J.M.; Ciantia, Matteo Oryem; O'Sullivan, Catherine (Australian Geomechanics Society, 2016)
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      The paper presents the modelling of the cone penetration test using two procedures: a discrete approach and a continuum approach. The discrete approach is based on the Discrete Element Method where a granular material is ...

    • Site characterization alternatives for numerical models of a deep excavation 

      Sau, Núria; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio (2012)
      Text en actes de congrés
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      A cut-and-cover railway tunnel site on the outskirts of Barcelona benefited from an extensive site investigation campaign. During the construction of the tunnel, the displacement of the wall as well as the of soil beneath ...

    • Size effects on a virtual calibration chamber 

      Butlanska, Joanna; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio (CRC Press. Taylor & Francies Group, 2010)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Virtual Calibration Chambers (VCC) are 3D-DEM models where cone penetration is simulated. They offer the possibility of substituting for the rather more expensive physical calibration chambers. One important issue in ...

    • Sphericity measures of sand grains 

      Rorato, Riccardo; Arroyo Alvarez de Toledo, Marcos; Andò, Edward; Gens Solé, Antonio (2019-05)
      Article
      Accés obert
      The sphericity of a grain should measure the similitude of its shape with that of a sphere. Sphericity is a shape descriptor of long-standing interest for sedimentology. Now it has gained also interest to facilitate discrete ...

    • Standard penetration testing in a virtual calibration chamber 

      Zhang, Ningning; Arroyo Alvarez de Toledo, Marcos; Ciantia, Matteo Oryem; Gens Solé, Antonio; Butlanska, Joanna (Elsevier, 2019-07)
      Article
      Accés obert
      The virtual calibration chamber technique, based on the discrete element method, is here applied to study the standard penetration test (SPT). A macro-element approach is used to represent a rod driven with an impact like ...

    • Static & dynamic probing of rough breakable sands 

      Zhang, Ningning; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio; Ciantia, Matteo Oryem (2022)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Both static and dynamic penetration tests are widely used to conduct soil investigation practice. Particle crushability has been known to greatly affect the responses of penetration tests. On the other hand, the physical ...

    • Steady state of solid-grain interfaces during simulated CPT 

      Butlanska, Joanna; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio (2013)
      Article
      Accés restringit per política de l'editorial
      It has recently been shown (Arroyo et al. [1]) that 3D DEM models are able to reproduce with reasonable accuracy the macroscopic response of CPT performed in calibration chambers filled with sand. However, the cost of ...

    • Testing a new submersible drill rig 

      Romero, F.; Devincenzi, M.J.; Pérez Garcia, N.; Arroyo Alvarez de Toledo, Marcos; Deu, Amadeu (Society for Underwater Technology, 2013)
      Text en actes de congrés
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      The paper describes the main features and initial underwater field-testing results of a remotely operated submersible drill rig designed to obtain continuous cores of soil and/or rock up to 6m long in water depths of 200m. ...