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Structural Monitoring and Maintenance
  Volume 4, Number 1, March 2017 , pages 17-31

Extensometers results correction in concrete dams: A case study in RCC Zhaveh Dam
Ahad Ziaei, Kaveh Ahangari, Parviz Moarefvand and Hasan Mirzabozorg

    Since extensometers are used to determine the absolute deformation of foundation and abutments and all results are obtained in reference to the base rod, the accuracy of these results has been constantly a subject of debate. In this regard, locating and installing extensometers outside the range of effect zone is also another challenge. The main purpose of this paper is to investigate and modify extensometers results based on the mentioned issues. For this aim, the concrete RCC Zhaveh dam in Iran was selected as the case study. To study the results of extensometers installed in this dam, first, the 3DEC_DP 5.00 software was applied for numerical modeling. Parameters such as discontinuities, dead load and piezometric pressure in the interface of concrete and rock were considered. Next, using the results obtained from 6 extensometers in foundation and abutments and 4 clinometers in dam body, the numerical model was calibrated through back analysis method. The results indicate that the base rod is moved and is not recommended being used as the base point. In other words, because installation of base anchor outside the range of effect zone is not possible due to the operational and economic considerations, the obtained results are not accurate enough. The results indicate a considerable 2-3 mm displacement of the base rod (location of the base anchor) in reference to the real zero point location, which must be added to the base rod results.
Key Words
    extensometer; clinometer; geomechanical parameters; dead load; piezometric pressure; 3DEC_DP
Ahad Ziaei, Kaveh Ahangari: Department of Mining Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

Parviz Moarefvand: Department of Mining and Metallurgical Engineering, Amir Kabir University of technology, Tehran, Iran

Hasan Mirzabozorg: Department of Civil Engineering, KN Toosi University of technology, Tehran, Iran

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