Construction and Monitoring of Cement/Bentonite Cutoff Walls: Case Study of Karkheh Dam, Iran
Autor: | Iman Faridmehr, Mohammad Javadi Jokar, Mohammad Reza YazdaniPour, Togay Ozbakkaloglu |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
Cement
karkheh dam hydrofraise 0211 other engineering and technologies 02 engineering and technology Engineering geology. Rock mechanics. Soil mechanics. Underground construction Geotechnical Engineering and Engineering Geology 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials cutoff wall Bentonite Cutoff TA703-712 Geotechnical engineering permeation Computers in Earth Sciences sealing 021101 geological & geomatics engineering Civil and Structural Engineering |
Zdroj: | Studia Geotechnica et Mechanica, Vol 41, Iss 4, Pp 184-199 (2019) |
Popis: | Water seepage is one of the most important features of embankment dams. To prevent and reduce seepage, it is necessary to seal the dam. Plastic concrete cutoff walls are one of the most efficient methods in waterproofing the foundation of embankment dams on permeable alluvial substrates. Sufficient resistance to loads, low permeability to maintain dam sealing, high ductility compatible with the foundation and deformation under load without cracking are the main requirements in plastic concrete cutoff walls. In this paper, the construction and implementation of the cutoff wall of Karkheh Dam, which is one the world’s largest water sealing projects, was studied. In addition, a numerical model using Seep-3D software was developed to evaluate the efficiency of the cut-off wall to decrease the seepage over the dam’s foundation. The numerical results validated by instrumentation statistics resulted from 17-years dam operation. According to the results, after the drainage of the reservoir, the cutoff wall optimally reduced the hydraulic gradient by 0.08 from 2.35 and the water leakage by 3.1 m/s from 18.3 m/s. |
Databáze: | OpenAIRE |
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