Page - 996 - in Book of Full Papers - Symposium Hydro Engineering

COMMISSION INTERNATIONALE DES GRANDS BARRAGES ------- VINGT-SIXIÈME CONGRÈS DES GRANDS BARRAGES Autriche, juillet 2018 ------- INTERNAL EROSION RISKS IN RIGHT ABUTMENT OF AHMADBEIGLU STORAGE DAM IN IRAN Mohammadi. AREZOO Senior Geotechnical Engineer POOYAB CONSULTING ENGINEERS Bemani Yazdi. ALI ASGHAR Head of Geotechnic and Dam Design Department POOYAB CONSULTING ENGINEERS IRAN 1. NTRODUCTION The Ahmadbeiglu Storage Dam site is located in Ardebil province (northwest of Iran) on the Meshginchay River. The main objective of the Ahmadbeiglu Storage Dam construction is to store for supplying water needed for agriculture, environmental and partially supply Meshginshahr domestic water demand. Ahmadbeiglu Dam site is located at the upstream of several villages with more than 1000 population and failure of this dam will result in loss of human life, extensive property damage to homes and other structures, thus, ahmadbeiglu Dam is high risk. In the spring of 2017, during the excavation of clay core foundation in the right abutment from elevation 980 m, seepage through this abutment observed. Since foundation behavior, especially soil foundations can significantly affect the stability of this kind of dams and internal erosion /piping through the soil foundation or along dam body-foundation is one of the leading causes of 996