Thesis SIMULACIÓN DE ENSAYES TRIAXIALES A TRAVÉS DE MODELACIÓN CON ELEMENTOS DISCRETOS
Date
2016
Authors
RAMOS SCHIAFFINO, PABLO FELIPE
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Abstract
Este estudio se enmarca en un proyecto del Laboratorio Nacional de Vialidad para encontrarformas alternativas para la estimación de la densidad máxima del suelo. Una de lasalternativas que se está barajando es la utilización del método de elementos discretos paraestos fines, pero, al ser un método nuevo y de alta complejidad, el estudio será una primeraaproximación a la modelación de ensayos triaxiales con elementos discretos, utilizando lacapacidad computacional limitada a un computador de escritorio. Para el estudio, se utilizóYade como el software de elementos discretos, la ley de interacción de la las partículas esNewton y la cantidad de elementos por simulación va desde 2000 hasta los 75000 elementos.En estas simulaciones se estudia la relevancia de los distintos parámetros como ángulode fricción, forma de partículas, la generación de elementos, entre otros. En una segundaetapa, se modela ensayes triaxiales de tres distintos materiales: rodamientos de acero, microesferas de vidrio y arena monotamaño. Los materiales antes mencionados van aumentandoen irregularidad y en complejidad del mecanismo de interacción. Estas simulaciones seráncomparadas con valores reales obtenidos de ensayes triaxiales, pudiéndose detectar cuandoel modelo se ajusta, qué puntos fuertes y débiles tiene, qué suposiciones son aceptables yqué mejoras serían necesarias incorporar para lograr mejores resultados.
This study is part of a project from the Laboratorio Nacional de Vialidad aiming to findalternative ways to estimate the maximum density of a soil. One of the alternatives beingconsidered for this purpose is the use of a method called Discrete Elements, which is fairlynew and complex. This study aims to be a first approach into the modelling of triaxial testusing discrete elements, with the limited capacity of a personal desktop computer. For thisstudy, Yade was used as a Dicrete Element Software and the Newton law of interaction ofparticles was used. The number of elements goes from 2000 up to 7500 per simulation.In this simulations, a study of the impact and relevance of the dierent parameters isperformed, such as friction angle, particle shape, element generation, among others. In asecond stage, three dierent materials are modeled simulating a triaxial test: steel bearingballs, glass micro spheres, and monosized sand particles. The irregularity and complexityof the interaction mechanism increases with each material in that order. This simulationsare to be compared with values obtained from actual triaxial tests, identifying when themodel is in line with the real life test, what are the strong and weak points of the model,and what assumptions are acceptable and the improvements necessary in order to achievebetter results.
This study is part of a project from the Laboratorio Nacional de Vialidad aiming to findalternative ways to estimate the maximum density of a soil. One of the alternatives beingconsidered for this purpose is the use of a method called Discrete Elements, which is fairlynew and complex. This study aims to be a first approach into the modelling of triaxial testusing discrete elements, with the limited capacity of a personal desktop computer. For thisstudy, Yade was used as a Dicrete Element Software and the Newton law of interaction ofparticles was used. The number of elements goes from 2000 up to 7500 per simulation.In this simulations, a study of the impact and relevance of the dierent parameters isperformed, such as friction angle, particle shape, element generation, among others. In asecond stage, three dierent materials are modeled simulating a triaxial test: steel bearingballs, glass micro spheres, and monosized sand particles. The irregularity and complexityof the interaction mechanism increases with each material in that order. This simulationsare to be compared with values obtained from actual triaxial tests, identifying when themodel is in line with the real life test, what are the strong and weak points of the model,and what assumptions are acceptable and the improvements necessary in order to achievebetter results.
Description
Catalogado desde la version PDF de la tesis.
Keywords
CLUMPS , DEM , ENSAYES TRIAXIALES