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Evaluation of the Behaviorof Earth and Rockfill Dams during Construction and First Impounding using Instrumentation data and Numerical Modeling (Case Study: Dam Gavoshan)

Rashidi, Mohammad | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43969 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Haeri, Mohsen
  7. Abstract:
  8. Monitoring is of particular importance after impounding and during dam operation. In all large dams, by installation of the required instruments the pore pressure, soil mass pressure and displacement during construction, first impounding and operation are measured, then the performance of dam will be analyzed and evaluated. The aim of this study is to evaluate the performance of the "Gavoshan" dam, which has an important role on agriculture development and drinking water supply at west part of Country. To reach this, the values resulting from instruments have been implemented by FLAC software, using "Back Analysis" method. However, this assessment is complete when "back analysis" method is applied to check and control the accuracy and reliability of the measurements; because the measurement accuracy can be obtained by comparison with the results obtained by the numerical model. On the other hand, if there is no proper consistency between measured performance and the model results, the analysis can be used to identify and interpret any abnormal or unexpected instrumentation result.The Mohr Coulomb elasto - plastic model has been considered as the performance model of the core and shell materials. The subsidence of the upper crustal materials during the initial impounding is modeled. By comparing the results obtained from the numerical analysis and the values measured by instruments, it is demonstrated that there is an acceptable consistency between them. Also, it was observed that the performance of the dam during construction and first impounding considering with regard of pore water pressure, the pore water pressure ratio ru, deformations, stresses, arching and the probability of the hydraulic failure is acceptable with proper safety, compared with the behavior of similar dams located in Iran and other countries
  9. Keywords:
  10. First Filling ; Numerical Modeling ; Instrumentation ; Earth Dam ; Rockfill Dam ; Pore Water Pressure

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