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Validation and modification of extensometer results in Karun-4 double-curvature arch concrete dam

Validation and modification of extensometer results in Karun-4 double-curvature arch concrete dam The present study was conducted to investigate and modify the extensometer results in double-curvature arch dams. To evaluate extensometer results of Karun-4 dam, first, the distinct element 3DEC-DP 5.00 software was used to model Karun-4 dam through a numerical model consisting of discontinuities, dead loads (dam weight) and piezometric pressure in the rock–concrete contact. Next, this numerical model was calibrated using 30 extensometer results in the dam foundation and abutments and 5 Direct Pendulum results in dam body. As the results show the base rod has a displacement due to the loads applied to the foundation and abutments and located outside the range of effect zone (disturbance zone), and thus it cannot be used as the base rod. Since no point has zero displacements in the numerical modeling and obtaining such a point is almost impossible, the accuracy of the electrical transducers was employed; the point in the numerical modeling with the lower displacement than the accuracy of transducers was selected as the base rod location. Next, the distance at which displacement of the base rod is zero was identified and the absolute deformation of each extensometer was determined. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Structural Integrity and Maintenance Taylor & Francis

Validation and modification of extensometer results in Karun-4 double-curvature arch concrete dam

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Validation and modification of extensometer results in Karun-4 double-curvature arch concrete dam

Abstract

The present study was conducted to investigate and modify the extensometer results in double-curvature arch dams. To evaluate extensometer results of Karun-4 dam, first, the distinct element 3DEC-DP 5.00 software was used to model Karun-4 dam through a numerical model consisting of discontinuities, dead loads (dam weight) and piezometric pressure in the rock–concrete contact. Next, this numerical model was calibrated using 30 extensometer results in the dam foundation and abutments and...
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Publisher
Taylor & Francis
Copyright
© 2018 Korea Institute for Structural Maintenance and Inspection
ISSN
2470-5322
eISSN
2470-5314
DOI
10.1080/24705314.2018.1492666
Publisher site
See Article on Publisher Site

Abstract

The present study was conducted to investigate and modify the extensometer results in double-curvature arch dams. To evaluate extensometer results of Karun-4 dam, first, the distinct element 3DEC-DP 5.00 software was used to model Karun-4 dam through a numerical model consisting of discontinuities, dead loads (dam weight) and piezometric pressure in the rock–concrete contact. Next, this numerical model was calibrated using 30 extensometer results in the dam foundation and abutments and 5 Direct Pendulum results in dam body. As the results show the base rod has a displacement due to the loads applied to the foundation and abutments and located outside the range of effect zone (disturbance zone), and thus it cannot be used as the base rod. Since no point has zero displacements in the numerical modeling and obtaining such a point is almost impossible, the accuracy of the electrical transducers was employed; the point in the numerical modeling with the lower displacement than the accuracy of transducers was selected as the base rod location. Next, the distance at which displacement of the base rod is zero was identified and the absolute deformation of each extensometer was determined.

Journal

Journal of Structural Integrity and Maintenance – Taylor & Francis

Published: Jul 3, 2018

Keywords: Extensometer; geomechanical parameters; instrumentation and monitoring; double-curvature arch concrete dams; 3DEC_DP 5.00 software

References

  • Suggested methods for monitoring rock movement using borehole extensometers
  • Displacement prediction in double-arch dam rock abutment using SPSS software based on extensometer readings case study Karun 4 concrete dam Iran
  • Estimation of normal and shear stiffness of discontinuities by statistical method
  • Back analysis of rock mass displacements around a deep shaft using two and three-dimensional continuum modeling
  • Extensometers results correction in concrete dams: A case study in RCC Zhaveh Dam