Stability analysis of Llerin Rockfill Dam: An in situ direct shear test

This paper analyzes the stability of the Llerin rockfill dam using Barton–Kjaernsli's shear criterion. To fit the parameters of this criterion, a direct shear test was designed that allows in situ calculation, using large-size samples of the shear stress at which failure is produced for differe...

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Bibliographic Details
Published in:Engineering geology 2008-09, Vol.100 (3), p.120-130
Main Authors: Oyanguren, P. Ramírez, Nicieza, C. González, Fernández, M.I. Álvarez, Palacio, C. González
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Dams and subsidiary installations
Exact sciences and technology
Friction angles
Hydraulic constructions
In situ shear test
Rockfill dam
Shear strength
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Summary:This paper analyzes the stability of the Llerin rockfill dam using Barton–Kjaernsli's shear criterion. To fit the parameters of this criterion, a direct shear test was designed that allows in situ calculation, using large-size samples of the shear stress at which failure is produced for different normal loads. These experimental values are then used to obtain more reliable values for the friction angle and the equivalent roughness of the rockfill material. The rockfill of Llerin dam is formed by a suitably ground gonfolite limestone rockfill that serves as a contention dam for a lagoon of mine tailings. The experimental results obtained in in situ tests were compared with those predicted by the shear criterion, subsequently determining the safety coefficient of the rockfill dam using the SLOPE computer program. We conclude that the values estimated via in situ testing permit the behaviour of the containment dam to be predicted more accurately.
ISSN:0013-7952
1872-6917
DOI:10.1016/j.enggeo.2008.02.009