Numerical Analysis of Rapid Drawdown of an Embankment Dam

Authors

  • A. H. Bhutto Department of Civil Engineering, Quaid-e-Awam University of Engineering Science and Technology, Pakistan
  • G. S. Bhurgri Department of Civil Engineering, Quaid-e-Awam University of Engineering Science and Technology, Pakistan
  • S. Zardari Department of Civil Engineering, Quaid-e-Awam University of Engineering Science and Technology, Pakistan
  • M. A. Zardari Department of Civil Engineering, Quaid-e-Awam University of Engineering Science and Technology, Pakistan
  • R. Bhanbhro Department of Civil Engineering, Quaid-e-Awam University of Engineering Science and Technology, Pakistan
  • B. A. Memon Department of Civil Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Pakistan

Abstract

Numerical analysis for the safe rate determination of lowering of an embankment dam was performed in this study with the use of the finite element method. Coupled deformation and consolidation analysis were carried out for staged construction and drawdown of a 59m embankment dam for varying undrained shear strength of the clay core. The lowering of the reservoir was performed at different depths between two extreme scenarios, i.e. rapid lowering rate (1m/day) and slow lowering rate (0.1m/day). The reservoir of the dam was lowered to a depth from 10m to 55m in gradual increments. The results indicated that the safety of the dam was satisfactory when the reservoir was lowered at the quick rate for a depth of 10m, 20m, 30m respectively when the undrained shear strength of the clay core was taken as 20, 25 and 30kN/m2. Regarding the case of slow drawdown rate of the reservoir, it was found that the reservoir could be lowered up to a depth of 55m at a rate of 0.1m/day when the undrained strength of clay core was 25kN/m2. The stability of the dam was also found satisfactory even though the reservoir was lowered at a rate of 0.25m/day for a depth of 55m when the undrained shear strength of clay core was 30kN/m2.

Keywords:

rapid drawdown, stability, safety factor, consolidation, undrained shear strength

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References

A. H. Bhutto, S. Zardari, G. S. Bhurgri, M. A. Zardari, R. Bhanbhro, B. A. Memon, M. M. Babar, “Mohr-Coulomb and hardening soil model comparison of the settlement of an embankment dam” , Engineering, Technology & Applied Science Research Vol. 9, No. 5, pp. 4654-4658, 2019 DOI: https://doi.org/10.48084/etasr.3034

A. H. Bhutto, S. Zardari, G. S. Bhurgri, M. A. Zardari, R. Bhanbhro, B. A. Memon, M. M. Babar, “Post construction and long term settlement of an embankment dam computed with two constitutive models”, Engineering, Technology & Applied Science Research Vol. 9, No. 5, pp. 4750-4754, 2019 DOI: https://doi.org/10.48084/etasr.3070

A. H. Bhutto, S. Zardari, G. S. Bhurgri, M. A. Zardari, R. Bhanbhro, B. A. Memon, M. M. Babar, “Parametric analysis of stability of an embankment dam”, Engineering, Technology & Applied Science Research, Vol. 9, No. 6, pp. 5016-5020, 2019 DOI: https://doi.org/10.48084/etasr.3180

S. S. Athani, C. H. Solanki, G. R. Dodagoudar, “Seepage and stability analyses of earth dam using finite element method”, Aquatic Procedia,Vol. 4, pp. 876-883, 2015 DOI: https://doi.org/10.1016/j.aqpro.2015.02.110

D. R. Vandenberge, “Total stress rapid drawdown analysis of the Pilarcitos dam failure using the finite element method”, Frontiers of Structural and Civil Engineering, Vol. 8, No. 2, pp. 115-123, 2014 DOI: https://doi.org/10.1007/s11709-014-0249-7

M. M. Berilgen, “Investigation of stability of slopes under drawdown conditions”, Computers and Geotechnics, Vol. 34, No. 2, pp. 81-91, 2007 DOI: https://doi.org/10.1016/j.compgeo.2006.10.004

H. Hasani, J. Mamizadeh, H. Karimi, “Stability of slope and seepage analysis in earth fills dams using numerical models. (case study: Ilam dam-Iran)”, World Applied Sciences Journal, Vol. 21, No. 9, pp. 1398-1402, 2013

M. Y. Fattah, H. A. Omran, M. A. Hassan, “Behavior of an earth dam during rapid drawdown of water in reservoir: Case study”, International Journal of Advanced Research, Vol. 3, No. 10, pp. 110-122, 2015

S. A. Khattab, “Stability analysis of Mosul dam under saturated and unsaturated soil conditions”, Al Rafdain Engineering Journal, Vol. 18, No. 1, pp. 13-27, 2010 DOI: https://doi.org/10.33899/rengj.2010.27983

Y. Gao, D. Zhu, F. Zhang, G. H. Lei, H. Qin, “Stability analysis of three-dimensional slopes under water drawdown conditions”, Canadian Geotechnical Journal, Vol. 51, No. 11, pp. 1355-1364, 2014 DOI: https://doi.org/10.1139/cgj-2013-0448

N. M. Pinyol, E. E. Alonso, S. Olivella, “Rapid drawdown in slopes and embankments”, Water Resources Research, Vol. 44, No. 5, 2008 DOI: https://doi.org/10.1029/2007WR006525

R. B. J. Brinkgreve, S. Kumarswamy, W. M. Swolfs, Plaxis reference manual, PLAXIS bv, 2017

WAPDA, Project planning report of Nai Gaj dam, Water And Power Development Authority of Pakistan, 2006

J. Schleiss, R. M Boes, Dams and reservoirs under changing challenges, CRC Press, 2011 DOI: https://doi.org/10.1201/b11669

M. Carter, S. P. Bentley, Soil properties and their correlations, John Wiley & Sons, 2016 DOI: https://doi.org/10.1002/9781119130888

F. Cobb, Structural engineer's pocket book: British standards edition, Elsevier, 2008

R. F. Craig, Soil mechanics, Springer, 2013

R. A. Rajapakse, Geotechnical engineering calculations and rules of thumb, Butterworth-Heinemann, 2015

G. E. Barnes, Soil mechanics: Principles and practice, Palgrave MacMillan, 2011

J. L. Justo, J. Saura, “Three‐dimensional analysis of Infiernillo dam during construction and filling of the reservoir”, International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 7, No. 2, pp. 225-243, 1983 DOI: https://doi.org/10.1002/nag.1610070207

B. G. Look, Handbook of geotechnical investigation and design tables, CRC Press, 2014

M. N. Sara, Site assessment and remediation handbook, CRC Press, 2003 DOI: https://doi.org/10.1201/9780203496442

P. J. Burgess, D. Sarabia, J. Small, H. G. Poulos, J. Sinha, “Settlement behaviour of a major dam”, ANCOLD 2006 Conference: Dams: The Challenges of the 21st century, Manly, Australia, November 19-22, 2006

L. Ormann, M. A. Zardari, H. Mattsson, A. Bjelkevik, S. Knutsson, “Numerical analysis of strengthening by rock fill embankments on an upstream tailings dam”, Canadian Geotechnical Journal, Vol. 50, No. 4, pp. 391-399, 2013 DOI: https://doi.org/10.1139/cgj-2012-0255

D. U. Deere, R. P. Miller, Engineering classification and index properties for intact rock, Air Force Systems Command, 1966 DOI: https://doi.org/10.21236/AD0646610

N. A Trenter, Earthworks: A guide, Thomas Telford Limited, 2001

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How to Cite

[1]
Bhutto, A.H., Bhurgri, G.S., Zardari, S., Zardari, M.A., Bhanbhro, R. and Memon, B.A. 2020. Numerical Analysis of Rapid Drawdown of an Embankment Dam. Engineering, Technology & Applied Science Research. 10, 2 (Apr. 2020), 5496–5500. DOI:https://doi.org/10.48084/etasr.3211.

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