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Descripción
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| We study the face stability of rock tunnels excavated by the drill and blast method, using an advanced failure mechanism in the framework of limit analysis. First, we study the influence of the geometry of the section and of the excavation process on the stability of the face, comparing a horseshoe section carried out in several stages with its equivalent circular section. Second, we investigate the influence on the collapse pressure of the damage induced in the rock mass during blasting, characterized by the Blast Damage Factor D. Results show that, as expected, multi-stage excavation sequences increase the stability of the face and that decreasing the height of the top-heading reduces the collapse pressure. Moreover, there is evident influence of the disturbance factor "D" on the collapse pressure, so that poor quality blasting can facilitate the collapse of the face. | |
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Internacional
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Si |
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Nombre congreso
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ISRM European Rock Mechanics Symposium (EUROCK 2014): Rock Mechanics and Rock Engineering: Structures on and in rock masses |
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Tipo de participación
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960 |
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Lugar del congreso
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Vigo (España) |
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Revisores
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Si |
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ISBN o ISSN
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978-1-138-00149-7 |
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DOI
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Fecha inicio congreso
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27/05/2014 |
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Fecha fin congreso
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29/05/2014 |
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Desde la página
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1087 |
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Hasta la página
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1091 |
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Título de las actas
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ISRM European Rock Mechanics Symposium (EUROCK 2014): Rock Mechanics and Rock Engineering: Structures on and in rock masses |