Optimization of horizontal drain dimensions in homogeneous earth dams using neural network

Document Type : Research Paper


1 Assistant Professor,Hydraulic Stucture ph.D.,Department of Civil Engineering, Faculty of Engineering,University of Ayatollah ozma Borujerdi,Borujerd,Iran,Komasi@abru.ac.ir.

2 M.Sc. Graduate, Department of Civil Engineering, Faculty of Engineering,University of Ayatollah ozma Borujerdi,Borujerd,Iran


Designing and optimizing the dimensions of drainage systems is very important for keeping the downstream shells dry and preventing the increase of pore water pressure in the body of earth dams. By optimizing the drainage dimensions, the minimum factor of safety, and consequently the construction costs, can be reduced. The purpose of this research was to optimize the size of horizontal drainage that is affected by some important parameters of the dam. In this study, a homogeneous earth dam was modeled using the Geostudio software. The minimum factor of safety was obtained by changing drainage dimensions, materials, and the slope of the dam body. A two-layer neural network was used to predict the least factor of safety resulted from different scenarios created in the software. By training the neural network based on the data obtained from homogeneous dams, the minimum factor of safety for drainage optimization was extracted. For optimal, an Mfile was fitted to the trained neural network function, by which the optimal values of the dam parameters were calculated.The results showed that the optimum values of drainage dimensions obtained for homogeneous dams for three heights of 10, 20, and 30 m could be generalized to other heights between 10 and 30 m with a simple interpolation.


[1] Tesarik, D.R and Kealy, C.D. (2005). Estimation horizontal drain design by the Finite-Difference method, International journal of mine water, 3:1-19
[2] Xu, Y.Q., Unami, K., and Kawachi, T. (2002). Optimal hydraulic design of the earth dam cross-section using saturatedunsaturated seepage flow model, Elsevier, Advances in Water Resource, 26: 1-7
[3] Chahar Bhagu, R. (2004). Determination of the length of the horizontal drain in homogeneous earth dams, Journal of irrigation and drainage engineering, 130:530-536
[4] Mishra, G.C., and Singh, A.K. (2005). Seepage through a levee. International Journal of Geomechanics, 74: 1532-3641
[5] Alonso, E., and Pinyol, N. (2009). Slope stability under rapid drawdown conditions. The report, published by Universitat Politècnica de Catalunya, Barcelona.
[6] Najafpour, N., Shayannezhad, M., and Samadi, H. (2014). Investigation of the pattern of the leakage lines and the design of paw drainage in homogeneous earth dams on impermeable soil using the PLAXIS physical and software model, Journal of Soil and Water (Agricultural Sciences and Technology). 28: 461-451.
[7] Malekpour, A. Farsadizadeh, D. Hosseinzadeh Delir, A. and Sadr Karimi, J. (2012). The effect of the horizontal drain on the stability of homogeneous earth dam under rapid discharge conditions, Journal of Water and Soil Science. 22:139-152
[8] Lowe, J., and Karafiath, L. (1980). Effect of anisotropic consolidation of the undrained shear strength of compacted clays, Proc Research Conference on Shear Strength of Cohesive Soils, 1-2 Feb, Boulder, Colorado. 237-258
[9] Baker, R., Rydman, S., and Talesnick, M. (1993). Slope stability analysis for undrained loading conditions. Int J NUM and Anal Methods Geomech, 17: 14-43
[10] US Army Corps of Engineers, (2003). Engineering and design manual slope stability, Engineer Manual EM 1110-2-1902, Department of the Army Corps of Engineers, Washington DC.
[11] Svano, G., and Nordal, S. (1987). Undrained effective stability analysis. Proc of the 9th European Conf on Soil Mech and Found Eng, 31 Aug-3 Sep. Dublin.
[12] Wright, S.G., and Duncan, J.M. (1987). An examination of slope stability computation procedures for sudden drawdown, Report GL-87-25. US Army Corps Engineers, Waterway Experiment Station.
[13] Lane, P.A., and Griffiths, D.V. (2000). Assessment of stability of slopes under drawdown conditions. J Geotech and Geoenv Eng, 126: 443-450
[14] Berilgen, M.M. (2007). Investigation of stability of slopes under drawdown conditions. J Computers and Geotech, 34: 81-91
[15] Duncan, J.M., and Wright, S.G. (2005). Soil Strength and Slope Stability. John Wiley & Sons, Inc., Hoboken, New Jersey
[16] Zomoradiyan, M.A, Abdollahzadeh, M, (2012). The Effect of Horizontal Drainages on the Upper Slope Sustainability of Earth dams during the drawdown of the Reservoir, Journal of Civil and Environmental Engineering, 42:29-35
[17] Bahrehbor, A. R, Bouzari. A and Bahrehbor. F. (2017). Laboratory study of the effect of the type of drainage system in the amount of leakage from the body and the homogeneous earth dam, 6th Environmental, Energy and Biological Conservation Conference, Tehran, Institute of Higher Education Arvand Stamp, Center for Sustainable Development
[18] Kalantari, B., and Nazeri, F. (2016). Effect of material quality on the stability of embankment, EJGE Journal, 21: 5061-5071
[19] Yazdanian, M., Afshoon, H.R., Ghasemi, S., Afshoon, V., and Fahim, F. (2017). Effect of height on the static stability of heterogeneous embankment dams, Journal of Engineering Science and Technology (ESTEC), 5:274-282
[20] Fattah, M.Y., Omran, H.A., and Hassan, M.A. (2017). Flow and stability of Al-wand dam during the rapid drawdown of water in the reservoir, Acta Montanistica Slovaca, 22: 43-57
[21] Darabi, M., and Maleki, M. (2017). Effect of drainage geometry on the dynamic response of homogeneous earth dams, Journal of Civil and Environmental Engineering, 48:99-108.