Now showing items 1-20 of 114

    • 3D DEM simulations of CPT in sand 

      Butlanska, Joanna; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio (2012)
      Conference report
      Restricted access - publisher's policy
      The paper contains an overview of the results obtained in a research project exploring the ability of 3D DEM models to reproduce cone penetration in sands. The sand whose behaviour is mimicked by the discrete material ...
    • A contact model for rough crushable sand 

      Zhang, Ningning; Ciantia, Matteo Oryem; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio (2021-06)
      Article
      Open Access
      Sand roughness is now accessible to measurement. Incorporating this parameter into sand models using the discrete element method (DEM) is known to improve bulk small strain response. In this work we explore the effect on ...
    • A new efficient strategy to simulate particle breakage in DEM analyses 

      Ciantia, Matteo Oryem; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio; Calvetti, Francesco (2014)
      Conference report
      Restricted access - publisher's policy
      The discrete element method (DEM) is increasingly gaining acceptance as a modelling tool for engineering problems of direct geotechnical relevance. One area for which the method seems naturally well adapted is that of ...
    • A new strategy to simulate particle crushing in DEM analysis 

      Ciantia, Matteo Oryem; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio; Calvetti, Francesco (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2014)
      Conference report
      Open Access
      The discrete element method (DEM) is progressively gaining acceptance as a modelling tool for engineering problems of direct geotechnical relevance. One area for which the method seems naturally well adapted is that of ...
    • A numerical investigation of the incremental behavior of crushable granular soils 

      Ciantia, Matteo Oryem; Arroyo Alvarez de Toledo, Marcos; Calvetti, Francesco; Gens Solé, Antonio (2016-09)
      Article
      Open Access
      The mechanical behavior of granular materials is characterized by strong nonlinearity and irreversibility. These properties have been differently described by a variety of constitutive models. To test any constitutive ...
    • A practical method for suction estimation in unsaturated soil testing 

      Amaral, M.F.; Viana da Fonseca, A.; Romero Morales, Enrique Edgar; Arroyo Alvarez de Toledo, Marcos (CRC Press, 2013)
      Conference report
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      This research presents an alternative methodology to estimate suction in triaxial tests carried out under constant water content. A preliminary determination of the retention curve is proposed using two complementary ...
    • A pressuremeter-based evaluation of structure in London Clay using a kinematic hardening constitutive model 

      Rouainia, M.; Panayides, Stelios; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio (Springer, 2020-08)
      Article
      Open Access
      The self-boring pressuremeter (SBP) test was designed to measure in situ engineering properties of the ground with a relatively small amount of disturbance. The properties that may be inferred from the test depend on the ...
    • A soft-rock model for cement-improved clays 

      Arroyo Alvarez de Toledo, Marcos; Ciantia, Matteo Oryem; Castellanza, R.; Gens Solé, Antonio (IOS Press, 2011)
      Conference report
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    • A stable mesh-independent approach for numerical modelling of structured soils at large strains 

      Monforte Vila, Lluís; Ciantia, Matteo Oryem; Carbonell Puigbó, Josep Maria; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio (Elsevier, 2019-12)
      Article
      Open Access
      We describe the large strain implementation of an elasto-plastic model for structured soils into G-PFEM, a code developed for geotechnical simulations using the Particle Finite Element Method. The constitutive model is ...
    • A structured constitutive model for simulating the behaviour of an overconsolidated bonded clay 

      González, Nubia A.; Gens Solé, Antonio; Arroyo Alvarez de Toledo, Marcos; Rouainia, Mohamed (CIMNE, 2011)
      Conference report
      Open Access
      The paper presents some improvements in the formulation of a kinematic hardening constitutive soil model incorporating structure initially proposed for soft clays. For the modelling of overconsolidated bonded clay the ...
    • A structured constitutive model for simulating the behaviour of an overconsolidated bonded clay 

      González, Nubia Aurora; Gens Solé, Antonio; Arroyo Alvarez de Toledo, Marcos; Rouainia, Mohamed (Centro Internacional de Métodos Numéricos en Ingeniería (CIMNE), 2011)
      Conference report
      Open Access
      The paper presents some improvements in the formulation of a kinematic hardening constitutive soil model incorporating structure initially proposed for soft clays. For the modelling of overconsolidated bonded clay the ...
    • A submersible drill rig for coring soils and rocks 

      Devincenzi, M.J.; Pérez Garcia, N.; Samoili, K.; Arroyo Alvarez de Toledo, Marcos (2012)
      Conference report
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      The paper describes the design and initial field-testing of a remotely operated submersible drill rig able to obtain continuous cores of soil and/or rock up to 6 m long. The rig mast angle is hydraulically actuated covering ...
    • An Approach to enhance efficiency of DEM modelling of soils with crushable grains 

      Ciantia, Matteo Oryem; Arroyo Alvarez de Toledo, Marcos; Calvetti, Francesco; Gens Solé, Antonio (Thomas Telford, 2015-02)
      Article
      Open Access
      In this study oedometric compression tests of hydrocarbon coke, Fontainebleau sand and silica sand are simulated in three dimensions using breakable particles. The method adapts a rigorous breakage criterion for elasto-brittle ...
    • Analysis of ground movements induced by diaphragm wall installation 

      Garitte, Benoit; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio (CRC Press, 2010)
      Conference report
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      The construction process of diaphragm walls can lead to movements in the surrounding area that are seldom taken into account. However, these movements may be important in situations where soft soils dominate. In this ...
    • Applying Bayesian updating to CPT data analysis 

      Collico, Stefano; Pérez, N.; Devincenzi, M.J.; Arroyo Alvarez de Toledo, Marcos (CRC Press, 2018)
      Conference lecture
      Open Access
      Evaluation of geotechnical parameters on a project site is a necessary step in geotechnical engineering. However, due to the inherent variability of soil properties and the lack of data, many unavoidable uncertainties arise ...
    • Automation and control in a submarine drill rig 

      Arriaga, Aldo; Devincenzi, M.; Pérez, N.; Deu, A.; Arroyo Alvarez de Toledo, Marcos (Society for Underwater Technology, 2017)
      Conference report
      Open Access
      Remotely operated submarine drills are gaining acceptance as offshore geotechnical investigation tools for they provide a more convenient and often cheaper solution to geotechnical drilling vessels. The MD500 is an underwater ...
    • Breakage and critical state via DEM 

      Ciantia, Matteo Oryem; O'Sullivan, Catherine; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio (International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE), 2019)
      Conference report
      Open Access
      Discrete-element simulations are used to explore the relation between breakage-induced grading evolution and the critical state line position on the compression plane. An efficient model of particle breakage is applied to ...
    • Cimentación directa para eólica marina 

      Arroyo Alvarez de Toledo, Marcos; Alcoverro Bassols, Jordi; Abadías, David; Gens Solé, Antonio (Sociedad Española de Mecánica del Suelo e Ingeniería Geotécnica, 2012)
      Conference report
      Restricted access - publisher's policy
    • Compression and shear wave propagation in cemented sand specimens 

      Amaral, M.F.; Viana da Fonseca, A.; Arroyo Alvarez de Toledo, Marcos; Cascante, G.; Carvalho, J. (2011)
      Article
      Restricted access - publisher's policy
      Ultrasonic and bender element tests in the laboratory are typically used to measure elastic modulus and damping ratio. However, interpretation of the results is challenging for a variety of reasons, including the influence ...
    • Cone penetration tests in a virtual calibration chamber 

      Arroyo Alvarez de Toledo, Marcos; Butlanska, Joanna; Gens Solé, Antonio; Calvetti, Francesco; Jamiolkowski, Michael (2011)
      Article
      Restricted access - publisher's policy
      A virtual calibration chamber was built using a threedimensional model based on the discrete-element method. The chamber was then filled with a scaled granular equivalent of Ticino sand, the material properties of which ...