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COMMISSION INTERNATIONALE DES GRANDS BARRAGES ------- VINGT-SIXIÈME CONGRÈS DES GRANDS BARRAGES Autriche, juillet 2018 ------- EVALUATION OF SLOPE STABILITY CONSIDERING EXISTENCE OF THE SPILLWAY CHANNEL TRENCH AT THE RIGHT AND LEFT ABUTMENTS OF GELEVARD DAM * Kayvan RAHIMI MSc Student, Geotechnical Engineering Department, ISLAMIC AZAD UNIVERSITY CENTRAL TEHRAN BRANCH (IAUCTB) Amir Ali ZAD Assistant professor, Geotechnical Engineering Department, ISLAMIC AZAD UNIVERSITY CENTRAL TEHRAN BRANCH (IAUCTB) IRAN 1. INTRODUCTION Glevard Dam project is located in Mazandaran Province and constructed on Neka Rover, and its middle point situated on the coordination of 36.59 N and 53.61 E. The type of dam is CFRD and maximum height of the dam from riverbed is 103 m and from bedrock is 113 m. Dam crest elevation is 739 m.a.s.l. with the dam crest length of 250 m and width of 10 m as shown in figure 1. Instead of morning glory spillway, the alternative spillway of the Glevard dam has been considered as a free spillway at the left abutment, with an appropriate safety margin from the fault passing from the abutment site. Figure 2 shows cross section of the geotechnical of the spillway route. The bedrock limestone has been identified through drilling in several boreholes. As already mentioned, spillway crest elevation has been considered as 733 m.a.s.l. and that of the approach canal level as 730 m.a.s.1., which is the normal reservoir water level. Capacity of volume between these two elevations has been considered as 8.65 million m3, which can control 50 and 100-yr floods, with small discharge * titre de l'article complet 1406