Erosion in the foundation of Abshineh Dam (Iran)

M. Rajabalinejad, M.H. Baziar, A. Noorzad, J.K. Vrijling

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Abstract

Almost 75% of dams in the world are constructed from soil and rock [1]; and, they can easily be damaged by seepage and piping. Earth fill dams usually suffer from this problem more; and, only a short time after the first impounding several embankment dams have collapsed [1,3, 4].
Abshineh dam, located in the west of Iran, is an earth fill dam with a clay core in which a complicated seepage has appeared through its foundation. Though, insufficient insitu testing and incomplete geotechnical investigations has led this situation, yet the highly weathered rock of foundation, insufficient depth of cut-off wall, and a fault and a Qanat1 crossing its foundation are the most important elements which must be considered in its seepage analysis.
SEEP2D, a well-known program in the underground seepage analysis, has been used to analyze the seepage flow and find the most eroded areas in the foundation of Abshineh dam. To make seepage model with a twodimensional program, the dam body and its foundation has been divided into several sections; and, for each section uniform soil properties are assumed. Then, the model has been updated with the insitu data which are mainly drilling, grouting, and piezometric data.
Outcomes of the analysis show a very good agreement between the calculated results and measured data. Moreover, the results prove that a high rate of erosion has been occurred in an extended zone of the dam's foundation. Moreover, the analyses of one line grouting, the method used to get the weathered foundation of Abshineh dam watertight, shows that this method does not provide a permanent remedial pattern.
In fact, the efficiency of (a very condensed) one-line grouting in a limited zone of the foundation of Abshineh dam has been analyzed and estimated maximum 60% (for seepage reduction) by the finite element program; therefore, the past experiences and conclusions 2 declaring that the reliability of one line grouting system is not as much as engineers can trust on it as the only system for seepage's controlling is certainly certified. Moreover, the conclusions of this research must be considered for the optimized selection of the remedial method.
Original languageEnglish
Title of host publicationProceedings 3rd International Conference on Scour and Erosion (ICSE-3)
Subtitle of host publicationNovember 1-3, 2006, Amsterdam
EditorsH. Verheij, G. Hoffmans
PublisherCURNET
Publication statusPublished - 2006
Externally publishedYes
Event3rd International Conference on Scour and Erosion, ICSE 2006 - Amsterdam, Netherlands
Duration: 1 Nov 20063 Nov 2006
Conference number: 3

Conference

Conference3rd International Conference on Scour and Erosion, ICSE 2006
Abbreviated titleICSE
CountryNetherlands
CityAmsterdam
Period1/11/063/11/06

Keywords

  • IR-89111

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