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Descripción
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| An approximated linearization approach based on the first order reliability method (FORM) is applied to analyse the system reliability of a circular tunnel in a jointed rock mass characterized by the Hoek-Brown non-linear failure criterion. Three failure modes are considered in this paper: exceedance of support deformation capacity, unacceptable tunnel convergence and insufficient rockbolt length. We employ the convergence-confinement method (CCM) to compute the stresses and displacements around the tunnel. Eight parameters?related to rock mass properties, in situ stress and shotcrete properties?are regarded as independent random variables with lognormal distributions.The series system reliability is computed, through the complementary of the intersection of safe domains, based on the results of FORM. An illustrative example is demonstrated with a circular tunnel.We compare the solution of the proposed method with Monte Carlo simulation (MCS) and bimodal bounds. The results show that the proposed approach can be applied to deal, efficiently and accurately, with the system reliability problem of circular rock tunnels. | |
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Internacional
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Si |
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Nombre congreso
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Proceedings of the 2014 ISRM European Rock Mechanics Symposium (EUROCK 2014) |
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Tipo de participación
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960 |
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Lugar del congreso
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Vigo, Spain |
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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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10.1201/b16955-135 |
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Fecha inicio congreso
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26/05/2014 |
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Fecha fin congreso
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28/05/2014 |
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Desde la página
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787 |
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Hasta la página
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791 |
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Título de las actas
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Rock Engineering and Rock Mechanics: Structures in and on Rock Masses. Proceedings of the 2014 ISRM European Rock Mechanics Symposium (EUROCK 2014) |