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Abstract

In this paper a 2D finite element model (SEEP2D) is implemented to study the actual head loss along the sheet piles fixed at the ends of an apron of a heading up structure. Different scenarios for the thickness of the pervious layer under the apron, the length of the apron and the depths of the upstream and downstream sheet piles are studied.  Results show that assuming the outer and inner faces of the sheet piles have the same weight for estimating the creep length while designing aprons of hydraulic structures is weak. Design equations for the actual head loss along the outer and inner faces for both the upstream and downstream sheet piles are driven. These equations can be used as a tool in the practical design for aprons of heading up structures formed on pervious soil and provided with upstream and downstream sheet piles at its ends.

Keywords

SEEP2D Seepage Heading-up structures Sheet piles Creep length.

Article Details

How to Cite
El-Molla, M., Saad, N. Y., & Ezizah, G. S. (2018). Evaluation of Actual Creep Length Under Heading up Structures Aprons. The Journal of Engineering Research [TJER], 15(2), 114–123. https://doi.org/10.24200/tjer.vol15iss2pp114-123

References

  1. AboulAtta N, Ezizah G, Yousif N, Anas D (2010), Study of the efficiency of downstream blanket in heading-up structures. Nile Basin Water Science and Engineering 3(1): 79-89.
  2. Aboulatta N, Ezizah G, El Molla D (2014), Modelling seepage effects in heterogeneous soil under heading-up structures using an experimental and numerical methodology. Ph.D. Thesis, faculty of engineering, Ain Shams University, Cairo, Egypt.
  3. Ahmed AA, Ellboudy AM (2010), Effect of sheet pile configuration on seepage beneath hydraulic structures. ASCE, International Conference on Scour and Erosion (ICSE-5) San Francisco, California, United States.
  4. Ahmed AA (2011), Design of hydraulic structures considering different sheet pile configurations and flow through canal banks. Computers and Geotechnics 38(4): 559-565.
  5. Anas D, Gad MA, Samy G, AboulAtta N (2012), A comparative analysis between electric and numerical seepage modeling techniques. The Seventh conference on Environmental Hydrology, American Society of Civil Engineers (ASCE), Cairo, Egypt.
  6. Eftekhar, Afzali S, Barani GA (2013), Application of the seep 3D software in modeling the effects of cutoff walls on the reduction of the seepage pressure and exit hydraulic gradient under hydraulic structure. Water Engineering Journal 5(15): 79-90.
  7. El Molla AM (2001), New trend for evaluating the percolation length under aprons of hydraulic structures provided with cut-off and founded on isotropic soil. CERM, Faculty of Engineering, Al -Azhar University 23(1).
  8. El Tahan AM, El-Molla AM (2013), Effects of cut-offs depth ratio on uplift and efficiency of front and back faces of upstream cut-off. 21st CSCE Canadian Hydrotechnical Conference, Alberta, Canada.
  9. Ezizah GMS, El-Molla AM, Abdellateef M, and El-Niazy Hammad M (2000), Seepage under hydraulic structures founded on complex formations. Ph.D. Thesis, Faculty of Engineering, Ain Shams University, Cairo, Egypt (this for ratios).
  10. Gad MA, Anas D, Atta NA, Samy G (2016), Worth of the 3D simulation of seepage in the vicinity of heading-up structures. KSCE Journal of Civil Engineering 20 (2): 679-686.
  11. Guerra P, Priestley D, Fredlund M (2012), 3D groundwater seepage analysis of a levee intersection. Canadian Dam Association (CDA) Annual Conference.
  12. Harr ME (1962), Groundwater and seepage. McGraw- Hill, New York.
  13. Kamble RK, Muralidhar B, Hanumanthappa MS, Patil AV, Edlabadkar JS (2014), Multiple approaches to analyse and control seepage in hydraulic structures", ISH Journal of Hydraulic Engineering, 20(1): 7–13.
  14. Koltuk S, Iyisan R (2013), Numerical analysis of groundwater flow through a rectangular cofferdam. Electronic Journal of Geotechnical Engineering (EJGE), 18.
  15. Noori BMA, Ismaeel KhS (2011), Evaluation of seepage and stability of duhok dam. Al-Rafidain Engineering Journal 19(1).
  16. Ozkan S (2003), Analytical study on flood induced seepage under river levees. Ph.D Dissertation, Louisiana State University, The Department of Civil and Environmental Engineering.
  17. SEEP2D Primer (1998), Brigham young University, Engineering Computer Graphics Laboratory.
  18. Serge Leliavsky (1965), Design of dams for percolation and erosion. Volume III, Oxford and IBH Publishing Co.
  19. U.S. Army Corps of Engineers, Washington DC (1986), Seepage analysis and control for dams. Engineer Manual 1110-1901.