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Ara es mostren els items 39-58 de 59

    • Laboratory experiments in soil mechanics by means of digital twins and low-cost equipment 

      Ledesma Villalba, Alberto; Prat Catalán, Pere; Lloret Morancho, Antonio; Chacón Flores, Rolando Antonio; Sondon Sansó, Mercedes (International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE), 2020)
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      The Soil Mechanics Laboratory has been traditionally an important issue in most courses on Soil Mechanics and Geotechnical Engineering. Nowadays, the available technology allows to build low cost systems that brings the ...

    • Large test to study the role of soil-air interaction in soil cracking 

      Cordero Arias, Josbel Andreina; Prat Catalán, Pere; Ledesma Villalba, Alberto; Cuadrado Cabello, Agustín (The Hong Kong University of Science and Technology (HKUST), 2018)
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      Soil surfaces in contact with the atmosphere are interfaces where different processes play an important role in triggering the formation of cracks due to desiccation. Empirical evidence shows that variables such as solar ...

    • Low lateral stiffness underground structures for improved seismic performance: application to the Kobe Daikai station 

      Bu, Xiangbo; Ledesma Villalba, Alberto; López Almansa, Francisco (Elsevier, 2023-09)
      Article
      Accés obert
      Underground cut-and-cover structures are commonly designed as rigid box sections; however, in practical applications, connections between walls and slabs are frequently rather hinged (because of ease of construction). The ...

    • Método de inversión generalizada: aplicación en sismología y posibilidades en ingeniería civil 

      Canas Torres, José Antonio; Ledesma Villalba, Alberto (1985)
      Article
      Accés obert
      El método de inversión generalizada ha sido aplicado extensamente en Geofísica, y en particular en Sismología, con sumo éxito. En este trabajo se describe en forma sucinta, pero suficientemente clara, dicho método, ...

    • Micro-measurement and monitoring system for ageing underground infrastructure (UndergroundM3) 

      Soga, K.; Ledesma Villalba, Alberto; Roncaglia, A.; Vanícek, I. (CRC Press/Balkema, 2012)
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      Advances in the development of computer vision, miniature micro-electro-mechanical systems (MEMS) and wireless sensor network (WSN) offer intriguing possibilities that can radically alter the paradigms underlying existing ...

    • Mitigación de grietas por desecación en suelos finos mediante el uso de fibras sintéticas 

      Hernández Valerio, Carolina; Botero Jaramillo, Eduardo; Encalada López, David Alejandro; Najdi, Abdallah; Prat Catalán, Pere; Ledesma Villalba, Alberto (Sociedad Mexicana de Ingeniería Geotécnica (SMIG), 2022)
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      Los suelos arcillosos tienen la propiedad de hincharse en presencia de agua y contraerse en su ausencia, produciendo así grietas por desecación que alteran significativamente su desempeño mecánico e hidráulico. En este ...

    • Negative skin friction on piles: a simplified analysis and prediction procedure 

      Alonso Pérez de Agreda, Eduardo; Josa Garcia-Tornel, Alejandro; Ledesma Villalba, Alberto (Institution of Civil Engineers (http://www.ice.org.uk/), 1984)
      Article
      Accés obert
      In order to describe the interaction between a single pile and a consolidating soil a stress transfer approach at the interface is proposed. The non-linear, plastic character of the shear stress acting on the pile shaft ...

    • Novel seismic design solution for underground structures. Case study of a 2-story 3-bay subway station 

      Bu, Xiangbo; Ledesma Villalba, Alberto; López Almansa, Francisco (Elsevier, 2022-02)
      Article
      Accés obert
      This paper proposes an innovative seismic design approach for shallow rectangular cut-and-cover underground subway or railway stations. The traditional approach is to design rigid frame-like structures by connecting rigidly ...

    • Numerical analysis of desiccation, shrinkage and cracking in low plasticity clayey soils 

      Levatti, Hector Ulises; Prat Catalán, Pere; Ledesma Villalba, Alberto (CIMNE, 2017)
      Text en actes de congrés
      Accés obert
      This paper presents a numerical study of the desiccation processes of low-plasticity clayey soils that usually result in shrinkage and often in cracking. For the theoretical development of the numerical model, concepts of ...

    • Numerical analysis of desiccation, shrinkage and cracking in low plasticity clayey soils 

      Levatti, Hector Ulises; Prat Catalán, Pere; Ledesma Villalba, Alberto (2017)
      Comunicació de congrés
      Accés obert
      This paper presents a numerical study of the desiccation processes of low-plasticity clayey soils that usually result in shrinkage and often in cracking. For the theoretical development of the numerical model, concepts of ...

    • Numerical and experimental study of initiation and propagation of desiccation cracks in clayey soils 

      Levatti, Hector Ulises; Prat Catalán, Pere; Ledesma Villalba, Alberto (Elsevier, 2019-01)
      Article
      Accés obert
      This paper presents the fundamentals and the mathematical formulation to study desiccation cracking in soils based on Unsaturated Soil Mechanics as well as a numerical analysis of a previous desiccation test program. The ...

    • One-dimensional cracking model in clayey soils 

      Ávila, G.E.; Ledesma Villalba, Alberto; Lloret Morancho, Antonio (2013)
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      It is difficult to formulate a general model to capture cracking initiation and evolution, because there are multiple factors that influence these processes. In order to simplify the evaluation and get more insight on the ...

    • Parameter and variance estimation in geotechnical backanalysis using prior information 

      Ledesma Villalba, Alberto; Gens Solé, Antonio; Alonso Pérez de Agreda, Eduardo (Wiley, 1996)
      Article
      Accés obert
      A probabilistic framework to perform inverse analysis of geotechnical problems is presented. The formulation allows the incorporation of existing prior information on the parameters in a consistent way. The method is ...

    • Patterns of cracking in soils due to drying and wetting cycles 

      Ledesma Villalba, Alberto; Cordero Arias, Josbel Andreina; Cuadrado Cabello, Agustín; Prat Catalán, Pere (CRC Press, 2014)
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      There is a well reported evidence of cracking in clayey or silty soils when drying. Shrinkage in the soil mass and also boundary conditions generate a nonhomogeneous stress state locally producing tensile stresses and ...

    • Protecting sensitive constructions from tunnelling: the case of World Heritage buildings in Barcelona 

      Ledesma Villalba, Alberto; Alonso Pérez de Agreda, Eduardo (Thomas Telford, 2017-10)
      Article
      Accés obert
      Construction of the tunnel for the high-speed Madrid–Barcelona–France railway link across central Barcelona became a major technical and social challenge due to the impact of the tunnel on nearby historic buildings (two ...

    • Protecting surface and buried structures from tunnelling using pile walls: a prediction model 

      Franza, Andrea; Losacco, Nunzio; Ledesma Villalba, Alberto; Viggiani, Giulia M.B.; Jimenez Rodríguez, Rafael (2021-10)
      Article
      Accés obert
      When tunnelling poses excessive risks for buildings and buried foundations, a pile row barrier may shield the existing structure from ground movements. This paper presents a three-dimensional linear elastic prediction ...

    • Soil desiccation cracks as a suction-contraction process 

      Cordero Arias, Josbel Andreina; Useche, G; Prat, P. C.; Ledesma Villalba, Alberto; Santamarina, J. C. (Institution of Civil Engineers (ICE), 2017-12)
      Article
      Accés obert
      Recent macro- and particle-scale advances in unsaturated soil behaviour have led to an enhanced understanding of the effects of moisture changes on soil response. This research examines desiccation cracks as a suction–co ...

    • Soil surface boundary condition in desiccating soils 

      Cuadrado Cabello, Agustín; Encalada López, David Alejandro; Ledesma Villalba, Alberto; Prat Catalán, Pere (The Icelandic Geotechnical Society (IGS), 2019)
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      Soils undergoing desiccation exhibit shrinkage and eventually cracking. That may become an environmental problem in practical applications. From a Geotechnical perspective, it is possible to solve the corresponding ...

    • THM analysis of a soil drying test in an environmental chamber: the role of boundary conditions 

      Cuadrado Cabello, Agustín; Najdi, Abdallah; Ledesma Villalba, Alberto; Olivella Pastallé, Sebastià; Prat Catalán, Pere (Elsevier, 2022-01)
      Article
      Accés obert
      This paper presents the numerical analysis of an experimental soil drying test carried on an initially slurry soil specimen with controlled temperature and relative humidity in a laboratory environmental chamber. The imposed ...

    • Toronto-York Spadina subway extension tunnelling under Schulich Building 

      Ramos Schneider, Gonzalo; García Molina, Ángel; Ledesma Villalba, Alberto; Raveendra, Ravi; Polo Orodea, Tomás (2019-02)
      Article
      Accés obert
      Tunnelling under the York University Schulich Building was one of the milestones of the Toronto-York Spadina Subway Extension Project. The challenge was to bore the tunnel under a flagship building only one diameter below ...