Authors: Jafari, Mohammad K.; Davoodi, Mohammad

Source: Canadian Geotechnical Journal, Volume 43, Number 10, October 2006 , pp. 997-1014(18)

Publisher: NRC Research Press

Abstract:

The responses to forced vibrations, ambient vibrations, and large explosives were measured for Masjed Soleiman Dam, the highest embankment dam in Iran. Based on the results of these tests, the first 23 modal frequencies of the dam were measured and the related mode shapes for the first 16 modes were identified. A modal analysis of the dam body was also performed. The effects of reservoir water level variation, the rigidity and flexibility of the foundation and abutments and their depths and inertial properties, and the effect of material properties on the dynamic characteristics of the dam body were investigated, and the first eight modes of the dam body were identified. A comparison of the results of the numerical analysis with those from the tests indicates the best fit in lower modes occurs when the complete mass foundation is considered, whereas in higher modes the massless foundation model is a better fit.Key words: embankment dam, forced vibration test, ambient vibration test, explosion, modal properties.

Les réactions à des vibrations forcées, à des vibrations ambiantes et à de forts explosifs ont été mesurées pour la barrage Masjed Soleiman, le plus haut barrage en terre en Iran. D'après les résultats de ces essais, les premières 23 fréquences modales de barrage ont été mesurées et on a identifié les formes modales correspondantes pour les 16 premiers modes. On a aussi réalisé une analyse modale du corps du barrage. On a étudié les effets de la variation du niveau d'eau du réservoir, de la rigidité et de la flexibilité de la fondation et des appuis, de leurs profondeurs et de leurs propriétés d'inertie, et l'effet des propriétés des matériaux sur les caractéristiques dynamiques du corps du barrage, et on a identifié les huit premiers modes du corps du barrage. Une comparaison des résultats de l'analyse numérique et des essais indiquent que la meilleure concordance dans les modes inférieurs se produit lorsque la masse complète de la fondation est prise en considération, alors que dans les modes plus élevés, le modèle de fondation sans tenir compte de la masse offre une meilleure concordance.Mots clés : barrage en terre, essai de vibration forcée, essai de vibration ambiante, explosion, propriétés modales.[Traduit par la Rédaction]

Document Type: Research article

Publication date: 2006-10-01

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• Published since 1963, this monthly journal features articles, notes, and discussions related to new developments in geotechnical and geoenvironmental engineering, and applied sciences. The topics of papers written by researchers, theoreticians, and engineers/scientists active in industry include soil and rock mechanics, material properties and fundamental behaviour, site characterization, foundations, excavations, tunnels, dams and embankments, slopes, landslides, geological and rock engineering, ground improvement, hydrogeology and contaminant hydrogeology, geochemistry, waste management, geosynthetics, offshore engineering, ice, frozen ground and northern engineering, risk and reliability applications, and physical and numerical modelling. Papers on actual case records from practice are encouraged and frequently featured.
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