Now showing items 21-40 of 47

    • Estimation of Parameters in Geotechnical Backanalysis: II. Application to a Tunnel Excavation Problem 

      Gens Solé, Antonio; Ledesma Villalba, Alberto; Alonso Pérez de Agreda, Eduardo (Elsevier, 1996)
      Article
      Open Access
      A general statistical framework to perform backanalysis in geotechnical problems from field instrumentation has been presented in a companion paper. Here, an application to a real case involving the excavation of a tunnel ...
    • Evaluation of alternative methodologies to minimize movements of a diaphragm wall close to buildings 

      de Santos, C.; Ledesma Villalba, Alberto; Lloret Morancho, Antonio; Alonso Pérez de Agreda, Eduardo (IOS Press, 2011)
      Conference lecture
      Restricted access - publisher's policy
      In the framework of the construction of the high-speed railway passing through Barcelona, a large excavation (21m depth) has made to about 2 m of a building. The excavation was done in the quaternary material typical of ...
    • Excavación de un pozo profundo para revisión de una tuneladora en el centro de Barcelona 

      Ledesma Villalba, Alberto; Lloret Morancho, Antonio; de Santos, C.; Ramos, Gonzalo; Alonso Pérez de Agreda, Eduardo; Vázquez Suñé, Enric; Pujades Garnes, Estanislao; Carrera Ramírez, Jesús (Sociedad Española de Mecánica del Suelo e Ingeniería Geotécnica, 2012)
      Conference report
      Restricted access - publisher's policy
    • Experimental analysis of 3D cracking in drying soils using ground-penetrating radar 

      Levatti, Hector Ulises; Prat Catalán, Pere; Ledesma Villalba, Alberto; Cuadrado Cabello, Agustín; Cordero Arias, Josbel Andreina (2017-03)
      Article
      Open Access
      This paper describes the capabilities of a novel technique to investigate crack formation and propagation in drying soils. The technique is a relatively simple, non-destructive indirect technique using a ground-penetrating-radar ...
    • Experimental analysis of desiccation cracks on a clayey silt from a large-scale test in natural conditions 

      Cordero Arias, Josbel Andreina; Prat Catalán, Pere; Ledesma Villalba, Alberto (2021-07)
      Article
      Restricted access - publisher's policy
      This paper presents an experimental investigation on the impact of environmental variables on soil cracking in natural conditions. The test was performed on a large soil specimen of initial size 3 × 3 × 0.5 m exposed to ...
    • Gb-SAR interferometry displacement measurements during dewatering in construction works : case of La Sagrera railway station in Barcelona, Spain 

      Serrano Juan, Alejandro; Vázquez Suñé, Enric; Montserrat, Oriol; Crosetto, Michele; Hoffmann Jauge, Christian; Ledesma Villalba, Alberto; Criollo, Rotman; Pujades, E; Velasco Mansilla, Domitila Violeta; García Gil, Alejandro; García Alcaraz, María del Mar (2016-04-29)
      Article
      Open Access
      Construction processes require monitoring to ensure safety and to control the new and existing structures. Traditional monitoring is based on land surveys and geotechnical instruments and only allows for point-like ...
    • Hybrid minimization algorithm applied to tunnel back analysis 

      Santos Rodríguez, Cristian de; Ledesma Villalba, Alberto; Gens Solé, Antonio (CRC Press Taylor & Francis Group, 2014)
      Conference report
      Restricted access - publisher's policy
      The paper describes a procedure to perform backanalysis in an automatic manner in the context of a tunnel excavation. The measured displacements are compared with the calculated ones obtained from a Finite Element Analysis, ...
    • Hydrogeological impact assessment by tunnelling at sites of high sensitivity 

      Pujades Garnes, Estanislao; Vázquez Suñé, Enric; Culi, Laura; Carrera Ramírez, Jesús; Ledesma Villalba, Alberto; Jurado Elices, Anna (2015-07)
      Article
      Open Access
      A tunnel for the High Speed Train (HST) was constructed in Barcelona with an Earth Pressure Balance (EPB) Tunnel Boring Machine (TBM). The tunnel crosses Barcelona and passes under some famous landmarks such as the Sagrada ...
    • Identificación de parámetros en geotecnia aplicación a la excavación de túneles 

      Ledesma Villalba, Alberto (Universitat Politècnica de Catalunya, 1987-04-06)
      Doctoral thesis
      Open Access
      En esta tesis se desarrolla una metodología general para la identificación de parámetros en problemas geotécnicos. <br/><br/>Dado un problema especifico se supone fijado un modelo (determinista) y se consideran conocidos ...
    • Identificación no lineal de movimientos sísmicos en el lecho rocoso ingenieril a partir de registros tomados en la superficie 

      Rodríguez Sánchez, Julio; López Almansa, Francisco; Ledesma Villalba, Alberto (Asociación Chilena de Sismología e Ingeniería Antisísmica, 2019)
      Conference report
      Open Access
      En ingeniería sísmica, los registros disponibles suelen ser superficiales y, en consecuencia, los movimientos en las capas inferiores deben ser estimados conociendo el perfil estratigráfico del terreno; estos movimientos ...
    • Impactos hidrogeologicos causados por la construccion del AVE en el entorno de la Sagrada Familia (Barcelona) 

      Pujades Garnes, Estanislao; Vázquez Suñé, Enric; Culi, Laura; Carrera Ramírez, Jesús; Ledesma Villalba, Alberto; Jurado Elices, Anna (Universidad Politécnica de Valencia, 2014)
      Conference report
      Restricted access - publisher's policy
      El tunel del AVE que atraviesa Barcelona fue construido con una tuneladora tipo EPB. El trazado del túnel pasa bajo la Sagrada Familia (declarada patrimonio de la humanidad por la UNESCO), y debido a los riesgos que entrañaba ...
    • Influence of cracking in the desiccation process of clay soils 

      Levatti, Hector Ulises; Prat Catalán, Pere; Ledesma Villalba, Alberto (2009)
      Conference report
      Open Access
      It is well known that clayey soils undergoing desiccation tend to shrink and eventually crack. Analysis of the behaviour and influence of cracks in these types of soils is very important in several engineering fields such ...
    • 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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference report
      Open Access
      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 ...
    • Método de inversión generalizada: aplicación en sismología y posibilidades en ingeniería civil 

      Canas Torres, José Antonio; Ledesma Villalba, Alberto (1985)
      Article
      Open Access
      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)
      Conference report
      Restricted access - publisher's policy
      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 ...
    • 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
      Open Access
      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 ...
    • Numerical analysis of desiccation, shrinkage and cracking in low plasticity clayey soils 

      Levatti, Hector Ulises; Prat Catalán, Pere; Ledesma Villalba, Alberto (CIMNE, 2017)
      Conference report
      Open Access
      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)
      Conference lecture
      Open Access
      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
      Open Access
      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 ...