Structural Monitoring and Maintenance

  • 제4권1호
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  • Pages.17-31
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  • 2017
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  • 2288-6605(pISSN)
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  • 2288-6613(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Extensometers results correction in concrete dams: A case study in RCC Zhaveh Dam

  • Ziaei, Ahad (Department of Mining Engineering, Science and Research Branch, Islamic Azad University) ;
  • Ahangari, Kaveh (Department of Mining Engineering, Science and Research Branch, Islamic Azad University) ;
  • Moarefvand, Parviz (Department of Mining and Metallurgical Engineering, Amir Kabir University of technology) ;
  • Mirzabozorg, Hasan (Department of Civil Engineering, KN Toosi University of technology)
  • 투고 : 2016.11.17
  • 심사 : 2017.02.06
  • 발행 : 2017.03.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

참고문헌

  1. ISRM. (1977), "Suggested methods for monitoring rock movement using borehole extensometers", document No. 5.
  2. Kamali Bandpey, H., Ahangari, K. and Hosseini Shirvani, H. (2011), "Displacement prediction in double-arch dam rock abutment using SPSS software based on extensometer readings case study Karun 4 concrete dam Iran", Am. J. Appl. Sci., 4(22), 4607-4616.
  3. Moshanir consulting engineering company. (2013), "Report of rock mechanic studies and execution characteristics of Zhaveh dam Tehran Iran".
  4. Seraj Abzar contractor engineering company. (2016), "Report of instrumentation and monitoring of Zhaveh dam Tehran Iran".
  5. Huggenberger company. (2016), "Manual of instruments, extensometers, jointmeters, rockmeters, switchland".
  6. Hyndman, R.J. and Koehler, A.B. (2006), "Another look at measures of forecast accuracy", Int. J. Forecast., 22(4), 679-688. https://doi.org/10.1016/j.ijforecast.2006.03.001
  7. Rafiei Renani, H., Derek Martin, C. and Hudson, R. (2016), "Back analysis of rock mass displacements around a deep shaft using two- and three-dimensional continuum modeling", Rock Mech. Rock Eng., 49(4), 1313-1327. https://doi.org/10.1007/s00603-015-0831-x

피인용 문헌

  1. Validation and modification of extensometer results in Karun-4 double-curvature arch concrete dam vol.3, pp.3, 2018, https://doi.org/10.1080/24705314.2018.1492666
  2. Nonlinear analysis of stability of rock wedges in the abutments of an arch dam due to seismic loading vol.7, pp.4, 2017, https://doi.org/10.12989/smm.2020.7.4.295