Graphic summary
  • Show / hide key
  • Information


Scientific and technological production
  •  

1 to 50 of 193 results
  • Ground penetrating radar system for detection of desiccation cracks in soils

     Prat Catalan, Pere; Ledesma Villalba, Alberto; Cuadrado Cabello, Agustin; Levatti, Hector Ulises
    International Symposium on Computational Geomechanics
    Presentation's date: 2013-08-22
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    In this paper we explore a relatively simple, non-destructive, indirect technique using a ground penetrating radar (GPR) system to detect cracks that form and propagate inside a soil specimen during desiccation. Although GPR devices have been used for multiple applications, their use in the detection of small cracks (few millimeters wide), has not been demonstrated yet. The experiments and the methodology used to test the accuracy of a small commercial GPR device for crack identification are described. The main objective was to identify what type of signals and what crack width can be detected using the GPR device. The results indicate that cracks of one or two millimeters wide can be detected depending on its position and shape. On the other hand, sub-millimeter cracks are undetectable with the currently existing devices in the market. In spite of the limitations the GPR method can be useful to find time-related bounds of when the cracks appear, and to point at their location. Because the GPR systems are in constant evolution this technique could become a very versatile and convenient method to scan soils under different kinds of processes both in the laboratory and in the field.

  • Evidences of hierarchy in cracking of drying soils

     Ramasesha Mookanahallipatna, Lakshmikantha; Prat Catalan, Pere; Ledesma Villalba, Alberto
    Geo-Congress
    Presentation's date: 2013-03
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    A large variety of morphologies of crack patterns can be found in nature. In many cases the cracks or joints form a closed network and thus divide a two-dimensional surface into distinct domains. Hierarchical patterns are natural phenomena in drying soils where they form and evolve driven by changes in material strength due to natural heterogeneities or due to cycles of stress increase and decrease following seasonal environmental changes. The process of division of domains usually follows a pattern that suggests the existence of some hierarchy. The hierarchical nature can be explained by three important processes: (1) stress generation beyond the material strength; (2) direction of stress generation; and (3) stress redistribution in the vicinity or inside the newly formed domain. In order to substantiate the theory of hierarchical crack pattern formation, experimental evidences showing the existence of hierarchy during crack pattern formation in laboratory desiccation tests is presented and analyzed.

  • Origin and mechanism of cracks seen at the bottom of a desiccating soil specimen

     Ramasesha Mookanahallipatna, Lakshmikantha; Prat Catalan, Pere; Reig, Ricard; Ledesma Villalba, Alberto
    Geo-Congress
    Presentation's date: 2013-03
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    During a laboratory experimental campaign (related to the PhD thesis of the first author) on soil cracking due to drying, several unseen morphological observations were made. Cracks were observed at the bottom of the desiccating specimen apart from the usual cracks at the drying exposed surface. The cracks observed at the bottom are a particularly interesting pattern of fissures, which is different from the one observed at the top specimen. That complicates the analysis of crack development, and obviously has many consequences on the strength properties of the material. In this paper we present the results of the laboratory experiments carried out especially to explore the origins and mechanisms of propagation of the cracks observed at the bottom of the specimen. Those experiments were conducted with the same specimen size but terminating the test at different stages of drying and observing the presence of cracks at the bottom. The data of different sensors at different locations in the specimen for a number of tests at different drying stages, along with the observation from images taken during the tests, lead to the identification of the mechanism of crack initiation at the bottom.

  • INTERACCION SUELO-ATMOSFERA: IMPLICACIONES EN EL AGRIETAMIENTO DE SUELOS

     Ledesma Villalba, Alberto; Cuadrado Cabello, Agustin; Cordero Arias, Josbel Andreina; Prat Catalan, Pere
    Participation in a competitive project

     Share

  • Experimental evidence of size effect in soil cracking

     Lakshmikantha, M. R.; Prat Catalan, Pere; Ledesma Villalba, Alberto
    Canadian geotechnical journal
    Date of publication: 2012-03
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Análisis numérico de presas de hormigón bajo acciones expansivas  Open access

     Campos de Moura, Andre
    Defense's date: 2012-11-23
    Department of Construction Engineering, Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    The main objective of this thesis is to study the mechanical behavior of a dam concrete under internal expansive phenomena in both the macro-structural and the meso-structural level. An important contribution of this work is the diffusion-reaction model proposed for the internal sulfate attack (ISA), which simulates the oxygen diffusion into the concrete and its consumption in the iron sulfides oxidation in the aggregates. This model allows obtaining the volume increments over time caused by the chemical reactions involved in the process. The mechanical analysis was conducted in the macro-structural and the meso-structural levels. The latter takes into account the expansions due to delayed ettringite formation in conventional concrete considering the explicit representation of the first level internal structure or meso-structure. The numerical results obtained were validated with experimental data from the literature. Then, the effects of the ISA in conventional concrete and in a dam concrete were analyzed, yielding a prediction of the young modulus and the tensile strength degradation depending on the degree of expansion of concrete. Furthermore, this dissertation shows the evolution of cracking and fracture energy dissipation, both of which were correlated with the degree of expansion and the variation of mechanical parameters. The results obtained illustrate the potential of the meso-structural model for analyzing different expansive processes in concrete. In the macro-structural level, real cases of dams affected by expansive problems were analyzed. The dams studied were Mequinenza, Paso Nuevo and Graus. The case of Mequinenza focused on the behavior of block 13-14 that presented pronounced non-recoverable displacements. A 2D model was used, including horizontal joints with non-linear behavior located where cracks had been observed. The numerical results show how the formation, evolution and opening of a series of horizontal cracks cause much of the displacements measured, thus realistically explaining the behavior of the dam. For the case of Paso Nuevo (an arch gravity dam affected by internal expansive problems), a 3D model was used to adjust the calculated displacement with the measured one. A hyperbolic strength criterion was used to assess the global behavior of the dam. Then, the left abutment zone was analyzed using a continuum non-linear damage model. Finally, the case of Graus was studied with linear models (2D and 3D). Then the analysis of block 5 was performed using a 2D model that included non-linear joints located where cracks and casting joints were present. The results obtained throughout this study reproduce satisfactorily the evolution of the expansive process in the macro-structural and meso-structural levels. They explain with good accuracy the anomalous behavior observed in the real cases studied and show the potential of the tools and methodology used in this work.

    El objetivo principal de esta tesis es el estudio del comportamiento mecánico del hormigón de presas bajo la acción de fenómenos expansivos de origen interno, tanto en el nivel mesoestructural como en el macroestructural. Un importante aporte de este trabajo es el modelo de difusión-reacción propuesto para el ataque sulfático interno (ASI), que permite simular la difusión de oxígeno hacia el interior del hormigón y su consumo en la oxidación de los sulfuros de hierro presentes en los áridos, y con ello obtener los incrementos de volumen a lo largo del tiempo que pueden producir las reacciones involucradas en el proceso. El análisis mecánico se ha abordado en dos niveles: el mesoestructural y el macroestructural. En el análisis mesoestructural (en que se representa explícitamente la estructura interna de primer nivel o meso-estructura) se analizan expansiones debidas a formación tardía de etringita en hormigón convencional contrastando los resultados numéricos obtenidos con experimentales existentes en la bibliografía. Luego, se analizan los efectos del ASI, en primer lugar, en un hormigón convencional y posteriormente, en un hormigón de presa. Se han obtenido curvas de la degradación del módulo de elasticidad y de la resistencia a tracción en función del grado de expansión. También se muestran aspectos de la fisuración y de la energía disipada, que se correlacionan con el nivel de expansión y la evolución de los parámetros mecánicos. En el análisis macroestructural, se estudian casos reales de presas afectadas por problemas expansivos. Las presas estudiadas son: Mequinenza, Paso Nuevo y Graus. En el caso de Mequinenza se analiza el comportamiento del bloque 13-14 que presenta unos elevados desplazamientos no recuperables. Para ello se utiliza una modelización 2D en el que se incluyen juntas horizontales (con un comportamiento no-lineal) donde se ubican fisuras observadas en la estructura. Los resultados numéricos obtenidos muestran cómo la formación, evolución y apertura de una serie de fisuras horizontales aportan gran parte de los desplazamientos observados en la estructura y permiten explicar de forma consistente el comportamiento diferenciado detectado en la presa. En el caso de la presa de Paso Nuevo (de tipo arco gravedad), afectada por problemas expansivos internos, se utiliza una modelización 3D con la que se ajustan los desplazamientos calculados con los medidos, y se evalúa el comportamiento global de la presa empleando un criterio hiperbólico de resistencia. Posteriormente, se realiza un análisis no-lineal de la zona cercana al estribo izquierdo utilizando para ello un modelo de daño no-lineal en el medio continuo. Finalmente, se estudia el comportamiento de la presa de Graus, inicialmente mediante modelos lineales (2D y 3D) y posteriormente se analiza la sección transversal del bloque 5 mediante una modelización 2D, en la que se incluyen juntas no-lineales donde se ubican las juntas de hormigonado y algunas fisuras observadas en la presa.

  • Numerical modeling of delayed and progressive failure in stiff clays with two-stage softening behaviour  Open access

     Zhan, Zhifeng
    Defense's date: 2012-06-19
    Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Based on the laboratory, field and numerical results, the post-rupture strength defined firstly by Burland (1990) is verified and introduced in this thesis to describe the two-stage post-peak strain-softening characteristics of stiff clays. The first softening stage is induced by the loss of interbonding between particles, i.e. the cohesive component of strength at relatively small displacement and hence termed as cementation loss; while the second is due to the gradual realignment, i.e. reorientation of clay particles at large displacements and can be called as gradual frictional resistance loss. A generalised constitutive model is then established to simulate the two-stage softening characteristics of stiff clays by modifying the Mohr-Coulomb model. This model is formulated and then implemented into an explicit finite difference program FLAC. The new model is applied to simulate laboratory tests such as triaxial compression tests and direct shear box test to depict the new model. The numerical results demonstrate the capability and efficiency of the modified softening model to model the two-stage strain-softening behaviour of stiff clays. A series of analyses of delayed progressive failure of cut slopes in stiff clays have been performed using two-stage softening model incorporating post-rupture strength. The numerical results reproduce well the progressive failure process, position of failure surface and failure time, which proves further the validity of the new model. Meanwhile, parametric analyses are also carried out to demonstrate the general influence of post-rupture strength. The results demonstrate that the slope stability with the adoption of two-stage softening model is reduced compared with that using one-stage softening model due to the quicker cohesion reduction with deviatoric plastic strain in the first softening stage of two-stage softening model. Both post-rupture strength concept and two-stage softening model are applied to the modelling of a famous case¿ Aznalcóllar dam failure under both inhomogeneous and homogeneous hypotheses. The simulations reproduced well the failure of Aznalcóllar dam including the location and shape of the slip surface, the progressive failure course and the development of pore water pressure in terms of the developments of shear strain rate, shear strain increment, displacement, velocity and strength parameter softening. The mechanism of Aznalcóllar dam failure is deemed to be progressive failure mainly due to the softening of Guadalquivir blue clay. The developments of average stress ratio, average residual factor, average brittleness, average stress path, the distribution of shear stress and mobilised strength parameters along the slip surface confirm further the mechanism of progressive failure of Aznalcóllar dam with these values to be intermediate between peak and residual values during the failure course. The post-rupture state could be thought as the average one at initial failure. At final failure, most part of the slip surface is at residual state, especially along the horizontal part. The Aznalcóllar dam failure is sensitive to the softening rate. Larger rates will induce earlier failure and no failure will occur with slow softening rates. Only an appropriate setting of softening rates can cause failure at final phase under both inhomogeneous and homogeneous hypotheses. Finally, the post-rupture concept is introduced to derive analytical solutions to limit pressure, the stress, strain, and displacement fields for the cylindrical cavity expansion in stiff overconsolidated clay. The results of computational examples and the similarity between numerical solution and analytical one verify the reasonableness of the analytical solution to cavity expansion in stiff clays with two-stage softening characteristics.

    Basado en los datos de laboratorio y de campo y los resultados numéricos, la resistencia post-ruptura definida por Burland (1990) se verifica y introduce para describir las dos etapas de ablandamiento post-ruptura de las arcillas rígidas. La primera etapa del ablandamiento está inducida por la pérdida de inter-conexión entre las partículas, o de la componente cohesiva de la resistencia a desplazamientos relativamente pequeños; la segunda etapa es debida al realineamiento gradual o reorientación de las partículas de arcilla a grandes desplazamientos y se puede llamar como pérdida gradual de la resistencia friccional. Se establece un modelo constitutivo general para simular las características de ablandamiento en dos etapas de las arcillas rígidas, modificando el modelo Mohr-Coulomb. La formulación de este modelo es ilustrada detalladamente y luego implementada en un programa explícito de diferencia finitas FLAC. Se aplica el nuevo modelo para simular los ensayos de laboratorio como ensayos de compresión triaxial y ensayos de corte directo. Los resultados numéricos demuestran la capacidad y eficiencia del modelo modificado de ablandamiento para reproducir el comportamiento de ablandamiento por deformación en dos etapas de las arcillas rígidas. Se han realizado una serie de análisis de la rotura progresiva diferida de taludes en arcillas rígidas, utilizando el nuevo modelo de ablandamiento en dos etapas con incorporación de la resistencia de post-ruptura. Los resultados numéricos reproducen bastante bien el proceso progresivo de la rotura, la posición de la superficie de rotura y el tiempo de rotura, lo cual brinda validez adicional al nuevo modelo. Adicionalmente, se ha llevado a cabo un análisis paramétrico para demostrar la influencia general de la resistencia de post-ruptura. Los resultados demuestran que se reduce la estabilidad de los taludes con la adopción del modelo de ablandamiento de dos etapas en comparación con lo de solo una etapa, debido a la reducción más rápida de la cohesión con la deformación plástica en primera fase de ablandamiento del modelo de ablandamiento de dos etapas. El concepto de la resistencia post-ruptura y el modelo de ablandamiento en dos etapas son aplicados en la simulación numérica del famoso caso de la rotura de la presa de Aznalcóllar bajo las dos hipótesis no homogéneos y homogénea. Las simulaciones reproducen bien la rotura de la presa de Aznalcóllar incluyendo el proceso progresivo de la rotura, la ubicación y la forma de la superficie de deslizamiento y el desarrollo de la presión del agua en los poros, según el desarrollo del estado de la plasticidad, la velocidad de la deformación de corte, el incremento de la deformación de corte, el desplazamiento, la velocidad y parámetros de resistencia del ablandamiento. El desarrollo de la relación media de las tensiones, el factor residual, la fragilidad media, la trayectoria de tensiones media y la distribución de las tensiones de corte movilizadas y los parámetros de resistencia movilizados a lo largo de la superficie de deslizamiento, confirman el mecanismo de rotura progresiva de la presa de Aznalcóllar debida principalmente al ablandamiento de la masa de arcilla azul del Guadalquivir, con estos valores en el intermedio entre los valores pico y residual durante el proceso de la rotura. La rotura de la presa de Aznalcóllar es sensible a la velocidad de ablandamiento de la deformación de corte plástica. Finalmente, se introduce el concepto de la resistencia post-ruptura de las arcillas rígidas para derivar las soluciones analíticas para la presión límite, las tensiones, las deformaciones y campos de desplazamientos de la expansión de cavidades cilíndricas en arcillas rígidas. Los resultados de los ejemplos de cálculo y la similitud entre la solución numérica y analítica verifican la razonabilidad de la solución analítica a la expansión de la cavidad en arcillas rígidas con las características de ablandamiento de dos etapas.

  • FISURACION TRIDIMENSIONAL EN SUELOS DEBIDA A OSCILACIONES DE VARIABLES MEDIOAMBIENTALES

     Jacinto, Carlos Abel; Ledesma Villalba, Alberto; Levatti, Hector Ulises; Prat Catalan, Pere
    Participation in a competitive project

     Share

  • Experimental and theoretical analysis of cracking in drying soils.

     Ramasesha Mookanahallipatna, Lakshmikantha
    Defense's date: 2009-06-12
    Barcelona School of Civil Engineering (ETSECCPB), Universitat Politècnica de Catalunya
    Theses

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    Influence of cracking in the desiccation process of clay soils  Open access

     Levatti, Hector Ulises; Prat Catalan, Pere; Ledesma Villalba, Alberto
    International Conference on Computational Plasticity Fundamentals and Applications
    Presentation's date: 2009-09-03
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    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 as mine tailing dams, long-term radioactive waste storage, impervious core of earth dams, and in any situation where clay is used as a barrier to fluid flow. Loss of humidity and cracking changes the permeability of such barriers that may no longer work properly and pose potentially high risks to property and lives. This paper presents an analysis of cracking during drying of soils using a computer code de-veloped within the framework of the finite element and finite differences methods. A study of the influence of crack initiation and propagation in the desiccation process is also undertaken, with a comparative analysis of the phenomenon both with and without crack generation that allows some preliminary conclusions about the desiccation problem. The computer code has been implemented within the MatLab environment. The formulation is based on the principles of the unsaturated soil mechanics and the mechanics of a continuum medium. The partial differential equations that govern the problem are solved using the finite element (Galerkin) method in space and the finite differences method, using the Crank-Nicholson scheme, in time. Further developments of the code will include fracture mechanics principles to simulate crack propagation.

  • Numerical modelling of desiccation processes in clayey soils

     Levatti, Hector Ulises; Prat Catalan, Pere; Ledesma Villalba, Alberto
    International Symposium on Computational Geomechanics
    Presentation's date: 2009-04-30
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Numerical modelling of desiccation proccesses in clayey soils

     Levatti, Hector Ulises; Prat Catalan, Pere; Ledesma Villalba, Alberto
    International Symposium on Computational Geomechanics
    Presentation's date: 2009-05-30
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Image Analysis for the Quantification of a Developing Crack Network on a Drying Soil

     Lakshmikantha, M R; Prat Catalan, Pere; Ledesma Villalba, Alberto
    Geotechnical testing journal
    Date of publication: 2009-11
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Coupled analysis of degradation processes in concrete specimens at the meso-level  Open access

     Idiart Castellano, Andrés Enrique
    Defense's date: 2009-07-10
    Department of Geotechnical Engineering and Geo-Sciences, Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    En los últimos años, el análisis numérico de problemas acoplados, como los procesos de degradación de materiales y estructuras relacionados con los efectos medioambientales, ha cobrado especial importancia en la comunidad científica de la mecánica del hormigón. Problemas de este tipo son por ejemplo el ataque químico, el efecto de altas temperaturas o la retracción por secado.Tradicionalmente, los análisis acoplados existentes en la literatura se han realizado a nivel macroscópico, considerando el material como un medio continuo y homogéneo. Sin embargo, es bien conocido que el origen de la degradación observada a nivel macroscópico, a menudo es debida a la interacción entre los áridos y el mortero, sobre todo cuando se dan cambios de volumen diferenciales entre los dos componentes. Esta es la razón por la que el análisis mesomecánico está emergiendo como una herramienta potente para estudios de materiales heterogéneos, aunque actualmente existen escasos modelos numéricos capaces de simular un problema acoplado a esta escala de observación.En esta tesis, la aplicabilidad del modelo meso-mecánico de elementos finitos, desarrollado en el seno del grupo de investigación durante los últimos quince años, se extiende al análisis de problemas acoplados higro-mecánicos y químico-mecánicos, con el fin de estudiar la retracción por secado y el ataque sulfático externo en muestras de hormigón. La generación numérica de mesogeometrías y mallas de elementos finitos con los áridos de mayor tamaño rodeados de la fase mortero se consigue mediante la teoría de Voronoï/Delaunay Adicionalmente, con el fin de simular las principales trayectorias de fisuración, se insertan a priori elementos junta de espesor nulo, equipados con una ley constitutiva basada en la mecánica de fractura no lineal, a lo largo de todos los contactos entre árido y matriz, y también en algunas líneas matriz-matriz.La aportación principal de esta tesis es, conjuntamente con la realización de análisis acoplados sobre una representación mesoestructural del material, la simulación no solo de la formación y propagación de fisuras, sino también la consideración explícita de la influencia de éstas en el proceso de difusión.Los cálculos numéricos se realizan mediante el uso de los códigos de elementos finitos DRAC y DRACFLOW, previamente desarrollados en el seno del grupo de investigación, y acoplados mediante una estrategia staggered. Las simula-ciones realizadas abarcan, entre otros aspectos, la evaluación del compor-tamiento acoplado, el ajuste de parámetros del modelo con resultados experimentales disponibles en la bibliografía, diferentes estudios del efecto de los áridos en la microfisuración inducida por el secado y las expansiones debidas al ataque sulfático, así como el efecto simultáneo de los procesos gobernados por difusión y cargas de origen mecánico. Los resultados obtenidos concuerdan con observaciones experimentales de la fisuración, el fenómeno de spalling y la evolución de las deformaciones, y muestran la capacidad del modelo para ser utilizado en el estudio de problemas acoplados en los que la naturaleza heterogénea y cuasi-frágil del material tiene un papel predominante.

  • Discussion on "Experimental study on fracture toughness and tensile strength of a clay"

     Prat Catalan, Pere; Ledesma Villalba, Alberto; Lakshmikantha, M R
    Engineering geology
    Date of publication: 2008-10
    Journal article

     Share Reference managers Reference managers Open in new window

  • A multiple-plane plasticity model for rock materials. Part II: verification and applications

     Sanchez Vila, Francisco Javier; Prat Catalan, Pere
    International Conference of International Association for Computer Methods and Advances in Geomechanics
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Sécheresse et constructions

     Ledesma Villalba, Alberto; Prat Catalan, Pere
    Symposium international "Sécheresse et constructions"
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • A multiple-plane plasticity model for rock materials. Part I: definitions of strength

     Sanchez Vila, Francisco Javier; Prat Catalan, Pere
    International Conference of International Association for Computer Methods and Advances in Geomechanics
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Effect of moisture content on tensile strength and fracture toughness of a silty soil

     Prat Catalan, Pere
    Unsaturated Soils: Advances in Geo-Engineering
    Presentation's date: 2008-07-02
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Effect of moisture content on tensile strength and fracture toughness of a silty soil

     Prat Catalan, Pere
    Symposium international "Sécheresse et constructions"
    Presentation's date: 2008-09-01
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Effect of moisture content on tensile strength and fracture toughness of a silty soil

     Prat Catalan, Pere; Ledesma Villalba, Alberto
    First European Conference on Unsaturated Soild
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Multilaminate and Microplane Models: Same Principles and Different Solutions for Constitutive Behaviour of Geomaterials

     Sanchez Vila, Francisco Javier; Prat Catalan, Pere; Galavi, V.; Schweiger, H.F.
    International Conference of International Association for Computer Methods and Advances in Geomechanics
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Fracture mechanics for crack propagation in drying soils

     Prat Catalan, Pere; Ledesma Villalba, Alberto; Lakshmikantha, M. R.; Levatti, Hector Ulises; Tapia, J.
    International Conference of International Association for Computer Methods and Advances in Geomechanics
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Numerical modelling of formation and propagation of drying cracks in soils

     Levatti, Hector Ulises; Prat Catalan, Pere; Ledesma Villalba, Alberto
    International Conference on Computational Plasticity
    Presentation's date: 2007-09
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Elasto-plastic microplane model for geotechnical applications

     Prat Catalan, Pere
    10th International Symposium on Numerical Models in Geomechanics
    Presentation's date: 2007-04-25
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Elastoplastic microplane model for cohesive-frictional materials. Application to geotechnical engineering problems.

     Prat Catalan, Pere
    Modelling of Heterogenenous Materials
    Presentation's date: 2007-06-25
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Stability of Rock Slopes in Sheffield

     Prat Catalan, Pere
    Date: 2007-07
    Report

     Share Reference managers Reference managers Open in new window

  • Experimental Evidence of Size Effect in Soil Cracking

     Lakashmikhanta, Ramasesha; Prat Catalan, Pere
    Date: 2007-03
    Report

     Share Reference managers Reference managers Open in new window

  • Real-time evaluation of a dessicating soil and 2-D crack network quantification

     Lakashmikhanta, Ramasesha; Prat Catalan, Pere
    Date: 2007-03
    Report

     Share Reference managers Reference managers Open in new window

  • Characterization of crack networks in desiccating soils using image analysis techniques

     Prat Catalan, Pere
    10th International Symposium on Numerical Models in Geomechanics
    Presentation's date: 2007-04-25
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Elastoplastic microplane model for cohesive-frictional materials. Application to geotechnical engineering problems

     Sánchez, F; Prat Catalan, Pere
    Modelling of Heterogenenous Materials
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Characterization of crack networks in desiccating soils using image analysis techniques

     Lakshmikantha, M R; Prat Catalan, Pere; Ledesma Villalba, Alberto
    10th International Symposium on Numerical Models in Geomechanics
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Elasto-plastic microplane model for geotechnical applications

     Prat Catalan, Pere; Sanchez Carracedo, Fermin; González, Nubia A.
    10th International Symposium on Numerical Models in Geomechanics
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • The deep-seated slope deformation at Encampadana, Andorra: Representation of morphologic features by numerical modelling

     Hürlimann Ziegler, Marcel; Ledesma Villalba, Alberto; Corominas Dulcet, Jordi; Prat Catalan, Pere
    Engineering geology
    Date of publication: 2006-01
    Journal article

     Share Reference managers Reference managers Open in new window

  • Presidente-moderador de sesión

     Prat Catalan, Pere
    16th European Conference of Fracture
    Presentation's date: 2006-07-03
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • An experimental study of cracking mechanisms in drying soils

     Lakshmikantha, M R; Prat Catalan, Pere; Ledesma Villalba, Alberto
    5th ICEG Environmental Geotechnics
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Size Effect in the Drying of Cracking Soils

     Lakshmikantha, M R; Prat Catalan, Pere; Ledesma Villalba, Alberto
    16th European Conference of Fracture
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • ENVOSCRACK (CGL2006-09847) EFECTO DE LAS OSCILACIONES MEDIOAMBIENTALES EN LA FORMACIÓN DE GRIETAS EN SUELOS

     Prat Catalan, Pere; Ledesma Villalba, Alberto; Levatti, Hector Ulises
    Participation in a competitive project

     Share

  • Size Effect in the Drying of Cracking Soils

     Prat Catalan, Pere
    16th European Conference of Fracture
    Presentation's date: 2006-07-03
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Failure of a micro-pile wall during remodelling of a hotel: a backanalysis

     Prat Catalan, Pere
    International Conference on Numerical Simulation of Construction Processes in Geotechnical Engineering for Urban Environment
    Presentation's date: 2006-03-23
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Failure of a micro-pile wall during remodelling of a hotel: a backanalysis

     Prat Catalan, Pere
    International Conference on Numerical Simulation of Construction Processes in Geotechnical Engineering for Urban Environment
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • An experimental study of cracking mechanisms in drying soils

     Prat Catalan, Pere
    5th ICEG Environmental Geotechnics
    Presentation's date: 2006-06-26
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Presentació

     Prat Catalan, Pere
    International Conference on Computational Plasticity
    Presentation's date: 2005-09-05
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Elastoplasticity within the framework of microplane models for geotechnical applications

     Prat Catalan, Pere; Sánchez, Prat P C F; González, N
    International Conference on Computational Plasticity
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window