2D-Flow Analysis Through Zoned Earth Dam Using Finite Element Approach

Abstract

This paper presents an application of finite element analysis using CivilFEM/ANSYS(11) software to predict two dimensional steady state water seepage through an earth dam of two soil zones resting on impervious base. Seepage characteristics (quantity and length of seepage surface) produced at downstream are investigated against permeability coefficient ratio changing of the two soil zones, and based on results of the solution it was found that seepage quantity and velocity downstream are very sensitive to any change of permeability ratio of the two soil zones forming the dam. Keywords: finite element method, seepage, dam, soil ‫ﺘﺭﺍﺒﻲ‬ ‫ﺴﺩ‬ ‫ﺨﻼل‬ ‫ﺍﻟﺒﻌﺩ‬ ‫ﺜﻨﺎﺌﻲ‬ ‫ﺍﻟﺠﺭﻴﺎﻥ‬ ‫ﺘﺤﻠﻴل‬) ‫ﻨﻁﺎﻗﻴﻥ‬ (‫ﺍﻟﻤﺤﺩﺩﺓ‬ ‫ﺍﻟﻌﻨﺎﺼﺭ‬ ‫ﻁﺭﻴﻘﺔ‬ ‫ﺒﺎﺴﺘﺨﺩﺍﻡ‬ ‫ﺍﻟﺨﻼﺼﺔ‬ ‫ﺍﻟ‬ ‫ﺍﻟﻤﻘﺩﻡ‬ ‫ﺒﺤﺙ‬ ‫ﻴﺸﻤل‬ ‫ﺒﺭﻨﺎﻤﺞ‬ ‫ﺨﻼل‬ ‫ﻤﻥ‬ ‫ﺍﻟﻤﺤﺩﺩﺓ‬ ‫ﺍﻟﻌﻨﺎﺼﺭ‬ ‫ﻨﻅﺭﻴﺔ‬ ‫ﺘﻁﺒﻴﻕ‬ ‫ﻋﻠﻰ‬ CivilFEM/ANSYS(11) ‫ﻤﻥ‬ ‫ﻴﺘﻜﻭﻥ‬ ‫ﺘﺭﺍﺒﻲ‬ ‫ﺴﺩ‬ ‫ﺨﻼل‬ ‫ﺍﻟﺒﻌﺩ‬ ‫ﺜﻨﺎﺌﻲ‬ ‫ﺍﻟﺜﺎﺒﺕ‬ ‫ﺍﻟﺘﺴﺭﺏ‬ ‫ﻅﺎﻫﺭﺓ‬ ‫ﻟﺘﻤﺜﻴل‬ ‫ﻭﻤﺴﺘﻨﺩ‬ ‫ﻟﻠﺘﺭﺒﺔ‬ ‫ﻨﻁﺎﻗﻴﻥ‬ ‫ﻟﻠﻤﺎﺀ‬ ‫ﻨﻔﺎﺫﺓ‬ ‫ﻏﻴﺭ‬ ‫ﻗﺎﻋﺩﺓ‬ ‫ﻋﻠﻰ‬. ‫ﺍﻟﺘﺴﺭﺏ‬ ‫ﺨﻭﺍﺹ‬ ‫ﺘﻐﺎﻴﺭ‬ ‫ﺩﺭﺍﺴﺔ‬ ‫ﺘﻡ‬) ‫ﺍﻟﺘﺼﺭﻴﻑ‬ ‫ﻜﻤﻴﺔ‬ ‫ﺍﻟﺘﺴﺭﺏ‬ ‫ﺴﻁﺢ‬ ‫ﻭﻁﻭل‬ ‫ﺃﺴﻔل‬ ‫ﺍﻟﺴﺩ‬ ‫ﻤﻨﺤﺩﺭ‬ (‫ﺍﻟﺘﺭﺒﺔ‬ ‫ﻨﻁﺎﻗﻲ‬ ‫ﺒﻴﻥ‬ ‫ﺍﻟﻨﻔﺎﺫﻴﺔ‬ ‫ﻨﺴﺏ‬ ‫ﺘﻐﻴﻴﺭ‬ ‫ﻤﻘﺎﺒل‬ .