Advertisement

Selecting Optimum Cutoff Wall Position for Rehabilitation of an Inclined Core Earthfill Dam

  • Hamed Farshbaf Aghajani
  • Mahsa Mousavi Anzabi
  • Zahra Sheikhi
  • Rahele Shokri
Conference paper

Abstract

Over the last few decades, a particular number of existing dams in Iran have required rehabilitation to improve the water sealing system performance. This paper aims to thoroughly investigate the effect of the cutoff wall position on the seepage behavior of an existing earthfill dam with an inclined core. Several conditions are considered for the permeability and depth of a dam foundation. Then, for each condition, the remedial cutoff wall is imposed in dam at various locations and the seepage pattern and magnitude through the foundation is analyzed via finite element GeoStudio SEEP/W software.

The analyses results show that if the cutoff wall is not connected to a lower impervious layer of foundation, the effects of the cutoff wall position variations on the seepage value are insignificant. However, if the cutoff wall is constructed at the dam heel, minimum seepage occurs. When the cutoff wall covers the whole of pervious foundation, the seepage through foundation is fully corresponded to the cutoff wall position. Minimum seepage is observed in cases where the cutoff wall is constructed from the dam crest. Besides, in foundation with higher permeability, the effect of the cutoff wall position on the seepage is more significant.

Keywords

Remedial cutoff wall Inclined clay core Earthfill dam Seepage analysis Rehabilitation 

References

  1. 1.
    Rice, J.D., Duncan, J.M.: Findings of case histories on the long-term performance of seepage barriers in dams. J. Geotech. Geoenvironmental Eng. 136(1), 2–15 (2009a)CrossRefGoogle Scholar
  2. 2.
    Anderson, E.I.: Exact and approximate solutions for seepage through semipermeable cutoff walls. Int. J. Geomech. 15(6), 04014087 (2014)CrossRefGoogle Scholar
  3. 3.
    Turkmen, S.: Treatment of the seepage problems at the Kalecik Dam. Eng. Geol. 68(3–4), 159–169 (2003)CrossRefGoogle Scholar
  4. 4.
    Aghajani, H.F.: Deciding for remediation of the seepage barrier system in foundation of an earthfill dam based on the monitoring data and numerical analysis. In: Shehata, H., Rashed, Y. (eds.) Numerical Analysis of Nonlinear Coupled Problems: Proceedings of the 1st GeoMEast International Congress and Exhibition, Egypt 2017 on Sustainable Civil Infrastructures, pp. 1–12. Springer, Cham (2018).  https://doi.org/10.1007/978-3-319-61905-7_1Google Scholar
  5. 5.
    Foster, M., Fell, R., Spannagle, M.: A method for assessing the relative likelihood of failure of embankment dams by piping. Can. Geotech. J. 37(5), 1025–1061 (2000)CrossRefGoogle Scholar
  6. 6.
    Rice, J.D., Duncan, J.M.: Deformation and cracking of seepage barriers in dams due to changes in the pore pressure regime. J. Geotech. Geoenvironmental Eng. 136(1), 16–25 (2009b).CrossRefGoogle Scholar
  7. 7.
    GEOSLOPE International, GeoStudio software (2004). http://www.geo-slope.com/

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Department of Civil Engineering, Faculty of EngineeringAzarbaijan Shahid Madani UniversityTabrizIran

Personalised recommendations