THE EFFECTIVE CONFIGURATION OF RELIEF WELLS DISTRIBUTION ON THE STABILITY FOR BARRAGES FLOOR | ||
| JES. Journal of Engineering Sciences | ||
| Article 3, Volume 39, No 5, September and October 2011, Pages 965-983 PDF (704.38 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.21608/jesaun.2011.129377 | ||
| Authors | ||
| Mohamed Abd-el Salam Ashour1; Mohamed Bahaa Eldin Ahmed Saad2; Ashraf Abd Elhai Alashaal3; Omran Abd Elfadil Omran Orabi4 | ||
| 1Professor of Irrigation- Civil Eng. Dept. Faculty of Engineering – Assiut University | ||
| 2Emerituy profession at Hydraulic Research Institute | ||
| 3Director of the Construction Institute National Water Research Center, MWRI | ||
| 4Head of Central Department of WR& I, M.SC, Civil Engineering, Assiut University, 2005 | ||
| Abstract | ||
| The hydraulic structures (dams, barrages, regulators…..) are complicated constructions and need an accurate technical and economical visibility studies; prepare design, execution and effective technique to be followed for maintenance. The percolation length is one of the most important items controlling the design of the water structures especially for apron length and thickness Seepage under the apron of the hydraulic structures was controlled by providing the apron with row or more of steel piles , but the sheet piles now is very high costs comparing by others options at the same time, and to improve the apron conditions of the old structure, the sheet piles is not possible to implement. In present paper, an apron with multiple rows of relief wells starting by one row of relief wells till six rows of relief wells were put under testing in different arrangements . An analog model was used with variable depths and distances between the relief wells rows in different arrangements. 96 runs were performed for one row of relief wells case, 84 runs were performed for two rows of wells case, 72 runs for three rows of relief wells case, 60 runs were performed for four rows of relief well case, 48 runs were done in five rows of relief case and 36 runs were performed in six rows of relief wells case. 429 reading node for every test run are recorded and plotted by using the surfer software. The conclusions, from the analysis of the obtained model results was as follows: The effective position in the potential of apron exit edge located near the edge of the apron for six rows of relief wells rows at (20%-30%- 40%-50%-60%-80%)Lap respectively, measured from upstream of an apron. The effective percentage reduced in potential of the apron exit edge is 73% and located at the 80% from the apron total length for six rows of relief wells (20-30-40-50-60-80). The efficiency of the U.S. relief wells is greater than that for the D.S. relief wells. | ||
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