Seepage Quantity Analysis Beneath Concrete Dams with Various Sheet Piles using Different Numerical Models

Main Article Content

Taban K. Hamad
https://orcid.org/0000-0001-7927-8301
Jehan M. Sheikh Suleimany
https://orcid.org/0000-0001-8152-5914
Tara H. Aurahman
https://orcid.org/0000-0003-1853-0600

Abstract

Seepage is a dangerous phenomenon under hydraulic structures and the main cause of failure and damage to dams when neglected and not processed. This study evaluates the numerical effects of the sheet piles' quantity, depth, and spacing beneath a concrete dam with isotropic and homogenous foundations on the seepage rate, pressure head, and exit gradient. The solutions were obtained using SEEP/W code in GeoStudio software 2018 for three configurations using single, double, and triple sheet piles. In addition, SLIDE software 6.02 was examined using single and double sheet piles. Dimensional analysis was applied to draw the dimensionless variables that affect the seepage rate and exit gradient, and all tests were repeated for three different sheet pile depths and distances from the heel of the dam. The findings showed that the seepage rate in all studied configurations reduced when sheet pile depth increased. The position of the sheet pile from the dam's toe significantly decreased the seepage rate in cases using single and double sheet piles, while in cases using three-sheet piles, the position of the middle sheet pile insignificant decreased seepage. It was recognized that when using a single sheet pile, the drop in pressure head increased with depths when the sheet pile was located at the heel and middle of the dam. In addition, in the case of a single sheet pile at the toe or using two and three-sheet piles, the pressure drop decreased as the depths increased. Also, the results showed that the middle sheet pile location in the case of three sheet piles slightly affected pressure reduction. Furthermore, the results showed that using two and three-sheet piles was more effective than using a single one in reducing the exit gradient, while the position of the middle one in the case of using three-sheet piles was insignificant. A nonlinear empirical equation was developed using SPSS 22 program, and the comparison of the seepage rate measured by SEEP/W and SLIDE software versus its quantity calculated from empirical equations showed a good agreement as the determinations (R2) coefficients were equal to 0.9779 and 0.9928, respectively.

Article Details

Section
Articles

References

Adamo N, Al-Ansari N, Sissakian V, Laue J, Knutsson S. Dam Safety Problems Related to Seepage. Journal of Earth Sciences and Geotechnical Engineering 2020; 10(6):191-239.‏

Arslan CA, Mohammad SA. Experimental and Theoretical Study for Pizometric Head Distribution under Hydraulic Structures. International Journal of Scientific and Technology Research 2015; 4(4):44-49.

Ahmed AA, Elleboudy AM. Effect of Sheet Pile Configuration on Seepage Beneath Hydraulic Structures. Proceeding’s 5th International Conference on Scour and Erosion 2010 ;( ICSE-5): 511-518. DOI: https://doi.org/10.1061/41147(392)49

Mohammed-Ali WS. The Effect of Middle Sheet Pile on the Uplift Pressure under Hydraulic Structures. European Journal of Scientific Research 2011; 65(3): 350-359.

Zainal EAK. The Effect of Cutoff Wall Angle on Seepage under Dams. Journal of Engineering 2011; 17 (5): 1109-1131.

Alnealy HKT, Alghazali NOS. Analysis of Seepage under Hydraulic Structures using Slide Program. American Journal of Civil Engineering 2015; 3 (4): 116-124. DOI: https://doi.org/10.11648/j.ajce.20150304.14

Uday AM, Hasan HM. Optimal Location of Drainage Gallery under Gravity Dam by using Finite Element Method. International Journal of Multidisciplinary Research and Mod Educational 2016; 2(1):611-622.

Jamel AA. Effect of Two Sheet Piles in Double Soil Layers on Seepage Properties under Hydraulic Structure using SEEP/W Program. Al-Nahrain Journal for Engineering Sciences 2017; 20(1): 194-205.

Nourani B, Salmasi F, Abbaspour A, Oghati BakhshayeshB. Numerical Investigation of the Optimum Location for Vertical Drains in Gravity Dams. Geotechnical and Geological Engineering 2017; 35(2):799-808. DOI: https://doi.org/10.1007/s10706-016-0144-1

Saleh LA. Studying the Seepage Phenomena under a Concrete Dam using SEEP/W and Artificial Neural Network Models. IOP Conference Series: Materials Science and Engineering 2018; 433 (1): 012029. DOI: https://doi.org/10.1088/1757-899X/433/1/012029

Rasool MH. Effect of Mutual Interference Piles on Seepage Properties under Hydraulic Structures. Kufa Journal of Engineering 2018; 9(4) :273-285. DOI: https://doi.org/10.30572/2018/KJE/090419

Das, Braja M. Advanced Soil Mechanics. CRC press, 2019. DOI: https://doi.org/10.1201/9781351215183

Blight GE. Unsaturated Soil Mechanics in Geotechnical Practice. CRC Press, 2013.‏ DOI: https://doi.org/10.1201/b15239

Similar Articles

You may also start an advanced similarity search for this article.