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Evaluation of Tunnel Elastic and Elasto-Plastic Deformations with Approximations Obtained from 3D-FEM Simulations
Evaluación de las deformaciones elásticas y elastoplásticas en túneles usando aproximaciones obtenidas de simulaciones 3D-FEM
DOI:
https://doi.org/10.15446/ing.investig.96880Keywords:
tunnels, finite element method, Mohr-Coulomb, elastic-elastoplastic (en)túneles, método de elementos finitos, Mohr-Coulomb, elástico-elastoplástico (es)
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Nowadays, there are computer tools designed to simulate engineering problems. Numerical simulations in three dimensions (3D) are the closest to reality, but they require a significant amount of time and experience. In this paper, the aim is to present formulae and graphs obtained from numerical simulations using the finite element method (FEM). Their application decreases the time required to obtain deformations in the periphery of different tunnel sections and further serves to evaluate them for different excavation lengths in the face of unexpected geotechnical changes during drilling. Using the RS2 and RS3 software, 3D analyses were carried out according to the Mohr-Coulomb (MC) model, considering elastic and elasto-plastic perfect behaviors as well as isotropic and anisotropic conditions. The graphs presented herein allow obtaining displacements from an axisymmetric model to infer the 3D displacements horseshoe tunnels, and the polynomial expressions aid in determining the displacements of an established excavation length. Finally, comparisons between the displacements reported by other authors and those obtained with the polynomial expressions are presented as a means of validation for this research.
En la actualidad existen herramientas computacionales diseñadas para simular problemas de ingeniería. Las simulaciones numéricas tridimensionales (3D) son las más cercanas a la realidad, pero requieren una cantidad importante de tiempo y experiencia. En este artículo, el objetivo es presentar fórmulas y gráficos obtenidos de simulaciones realizadas utilizando el método de elementos finitos (FEM). La aplicación de estos disminuye el tiempo requerido para obtener deformaciones en la periferia de distintas secciones de túnel, e incluso funciona para evaluarlas con respecto a distintas longitudes de excavación cuando se encuentren cambios geotécnicos inesperados durante la perforación. Mediante el software RS2 y RS3, se realizaron análisis 3D de acuerdo con el modelo Mohr-Coulomb, teniendo en cuenta comportamientos elásticos y elastoplásticos perfectos, así como condiciones isotrópicas y anisotrópicas. Los gráficos aquí presentados permiten obtener los desplazamientos a partir de un modelo axisimétrico para a su vez inferir los desplazamientos 3D de túneles con forma de herradura, y las expresiones polinómicas ayudan a determinar los desplazamientos de una longitud de excavación establecida. Por último, se presentan comparaciones entre los desplazamientos reportados por otros autores y aquellos obtenidos con las expresiones polinómicas como medio para la validación de esta investigación.
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