STUDYING THE EFFECT OF WATER TABLE ELEVATION ON SEISMIC CHARACTERISTIC OF CRITICAL SLICE SURFACE ON EMBANKMENT DAMS (A CASE STUDY OF MASJED SOLEIMAN DAM)

Evaluation of seismic behavior in different water table elevation is important because of continues using of water in dam reservoir. To achieve this goal, Masjed Soleiman dam for a case study has been selected. Finite Element model of Masjed Soleiman dam has been constructed. First, layer analyses have been carried out considering 12 layers in end of construction stage. Then, this analysis has been continued considering water table and weight of dam reservoir. 2 earthquake records have been applied horizontally to the bedrock for dynamic analysis. For study of water table elevation effect, 10 models have been used with different water table elevation. In this study, to perform stability analysis and calculate the factor of safety, critical sliding surface reported by the consultant engineers has been considered. Finally, for critical sliding surface, equal dynamic factor of safety derived from factor of safety in time domain and then has been compared static factor of safety. Result shows that, equal dynamic safety factor in downstream critical slice surface has been increased as increasing water table elevation. Even equal dynamic factor of safety in upstream critical slice surface has been decreased to 0.6 height of dam and for another has been increased.