تحليل نشت تكيه گاه هاي سد ليرو با استفاده از روش تركيبيDFN-DEM

Liroo dam abutments leakage analysis using DFN-DEM hybrid method

ﺳﺪ ﻟﯿﺮو از ﺳﺪﻫﺎي ﺑﺰرگ ﺑﺘﻨﯽ ـــ دوﻗﻮﺳﯽ ﮐﺸﻮر و در دﺳﺖ ﻣﻄﺎﻟﻌﻪ در اﺳﺘﺎن ﭼﻬﺎرﻣﺤﺎل ﺑﺨﺘﯿﺎري اﺳﺖ. ﻫﺪف، ﺑﺮرﺳﯽ و ﺗﺨﻤﯿﻦ ﻣﯿﺰان ﻧﺸﺖ آب از درزه و ﺷﮑﺴﺘﮕﯽﻫﺎي ﻣﻮﺟﻮد در ﺗﮑﯿﻪﮔﺎهﻫﺎي ﺳﺪ ﺑﺎ اﺳﺘﻔﺎده از روش ﻋﺪدي ا ﺳﺖ. ﺷﮑ ﺴﺘﮕﯽﻫﺎي ﻣﺘ ﺼﻞﺑﻪﻫﻢ ﺑﻪﻋﻨﻮان ﻣ ﺴﯿﺮﻫﺎي ا ﺻﻠﯽ ﺟﺮﯾﺎن آب ﺑﻪ داﺧﻞ ﺗﮑﯿﻪﮔﺎهﻫﺎ و ﮐﻨﺘﺮلﮐﻨﻨﺪه رﻓﺘﺎر ﻫﯿﺪروﻟﯿﮑﯽ ﺗﻮدهﺳــﻨﮓ اﺳــﺖ. در ﻧﻈﺮ ﮔﺮﻓﺘﻦ وﯾﮋﮔﯽﻫﺎي ﺗﺼــﺎدﻓﯽ ﭘﺎراﻣﺘﺮﻫﺎي ﻫﻨﺪﺳــﯽ درزه ﺑﺨﺼــﻮص ﭘﺎﯾﺎﯾﯽ درزهﻫﺎ و اراﺋﻪ ﻣﺪﻟﯽ واﻗﻌﯽﺗﺮ ﮐﻪ ازﻟﺤﺎظ آﻣﺎري ﻣﻌﺘﺒﺮ ﺑﻮده، ﮔﻮﯾﺎي وﯾﮋﮔﯽﻫﺎي ﺗﻮدهﺳــﻨﮓ ﺑﺮﺟﺎ ﺑﺎﺷــﺪ، ﺑﻪﻣﻨﻈﻮر ﺗﺤﻠﯿﻞﻫﺎي ﻫﯿﺪروﻟﯿﮏ ﺿﺮوري ا ﺳﺖ. در ﺑ ﺴﯿﺎري از ﻣﺪل ﺳﺎزيﻫﺎي ﻫﻨﺪ ﺳﯽ ﻣﺆﻟﻔﻪﻫﺎي ﻫﻨﺪ ﺳﯽ درزهﻫﺎ ازﺟﻤﻠﻪ ﭘﺎﯾﺎﯾﯽ، ﺑﺎزﺷﺪﮔﯽ و ﺟﻬﺖداري ﺑﺎ ﻓﺮضﻫﺎي ﻏﯿﺮواﻗﻌﯽ ﺳﺎده ﮐﻨﻨﺪه ﺑﻪﺻﻮرت ﺛﺎﺑﺖ در ﻧﻈﺮ ﮔﺮﻓﺘﻪ ﻣﯽﺷﻮد ﮐﻪ ﺑﺎﻋﺚ ﻋﺪم ﺗ ﺸﺎﺑﻪ ﻣﺪل ﻫﻨﺪ ﺳﯽ و رﻓﺘﺎر ﻫﯿﺪروﻟﯿﮑﯽ ﺗﻮده ﺳﻨﮓ ﺑﺎ واﻗﻌﯿﺖ ﺧﻮاﻫﺪ ﺷﺪ. ﺑﻨﺎﺑﺮاﯾﻦ، ﻣﺪل ﻫﻨﺪ ﺳﯽ ﺷﺒﮑﻪ درزهﻫﺎي ﮔﺴﺴﺘﻪ )DFN( ﺑﻪﺻﻮرت ﺳﻪﺑﻌﺪي ﺑﺎ اﺳﺘﻔﺎده از ﮐﺪ ﻧﻮﺷﺘﻪﺷﺪه 3D-DFN ﺗﻬﯿﻪ ﺷﺪ در اﯾﻦ ﺗﺤﻘﯿﻖ ﮐﺪ ﻗﺒﻠﯽ ﺑﻪﻣﻨﻈﻮر ﺗﻌﯿﯿﻦ دﻗﯿﻖ ﻣﺴﯿﺮﻫﺎي ﺟﺮﯾﺎن ﻫﯿﺪروﻟﯿﮏ ﺗﻮﺳﻌﻪ داده ﺷﺪ. درﻧﻬﺎﯾﺖ ﭘﺲ از اﻋﺘﺒﺎرﺳﻨﺠﯽ ﻣﺪل ﺗ ﺼﺎدﻓﯽ ﺷﺒﮑﻪ درزهﻫﺎي ﺳﺎﺧﺘﻪ ﺷﺪه ﺑﺎ ﻣﻘﺎدﯾﺮ ﺑﺮدا ﺷﺖ ﺷﺪه ﻣ ﺸﺨﺺ ﺷﺪ، اﯾﻦ اﻧﻄﺒﺎق ﺑﻪﻃﻮر ﻣﺘﻮ ﺳﻂ ﺑﺮاي ﻣﺆﻟﻔﻪﻫﺎي ﻣﺨﺘﻠﻒ ﻫﻨﺪﺳــﯽ و ﻣﻘﺎدﯾﺮ ﺷــﺪتﻫﺎي درزهداري ﺑﯿﺶ از 90 درﺻــﺪ اﺳــﺖ. اﯾﻦ ﻧﺘﺎﯾﺞ ﺑﻪﻋﻨﻮان ورودي ﻗﺎﺑﻞاﻃﻤﯿﻨﺎن ﻣﺪل ﻫﻨﺪﺳــﯽ ﺑﺮاي ﻣﺪلﺳــﺎزي ﺟﺮﯾﺎن ﻫﯿﺪروﻟﯿﮏ ﺗﮑﯿﻪﮔﺎهﻫﺎي ﭼﭗ و راﺳــﺖ ﺑﻪ روش اﻟﻤﺎنﻫﺎي ﮔﺴﺴﺘﻪ )DEM( در ﻣﺤﯿﻂ ﻧﺮماﻓﺰاري UDEC اﺳﺘﻔﺎده ﺷﺪ. ﻣﯿﺰان ﻧﺸﺖ درﻣﺠﻤﻮع دو ﺗﮑﯿﻪﮔﺎه ﺑﺮاﺑﺮ m3/Year 135415ﻣﺤﺎﺳﺒﻪ ﺷﺪ. در ﻣﻘﺎﯾﺴﻪ ﺑﺎ ﺣﺠﻢ ﻣﻔﯿﺪ ﻣﺨﺰن ﻣﺠﻤﻮع ﻧﺸﺖ از ﻫﺮ دو ﺗﮑﯿﻪﮔﺎه 0/03 درﺻﺪ از اﯾﻦ ﺣﺠﻢ ﻣﻔﯿﺪ را ﺷﺎﻣﻞ ﻣﯽﺷﻮد.

The Liroo Dam is one of the largest concrete dams in the country under study. The objective is to investigate and estimate the amount of water leakage from joints and fractures in dam abutments using numerical method. Interconnected fractures are the main pathways of water flow into the abutments and control the rock hydraulic behavior. Considering the stochastic properties of the geometric parameters of the joints, especially the persistence of the joints, and the presentation of a more realistic model is essential for hydraulic analysis. Therefore, geometric model of discrete fractures network (DFN) was prepared in 3D using 3D-DFN written code. Finally, after validation of DFN model constructed with the extracted values, it is found that the average fit for the different geometrical components and the values ​​of the joints intensities are over 90%. These results were used as reliable inputs of the geometrical model for modeling the hydraulic flow of the left and right abutments using the Discrete Element Method (DEM) in the UDEC software. The total leakage rate was calculated to be 135415 m3 / year. Compared to the useful volume of the reservoir, the total leakage from both supports comprises 0.03% of this useful volume.