بررسی تاثیر ارتفاع آب مخزن بر رفتار لرزه‌ای سدهای خاکی(مطالعه موردی سد مسجد سلیمان) دوره 11، شماره 3، پاییز 1390

Level of the water table on reservoir is one of the parameters that effects on seismic behavior of embankment dams. To evaluate the effect of this parameter, Masjed Soleiman dam for a case study has selected. Finite Element model of Masjed Soleiman dam has been constructed considering the Mohr-Coulomb failure criterion for the body of the dam. First, layer analysis was carried out considering 12 layers in end of construction stage. Then, this analysis was continued considering water table and weight of the dam reservoir in steady seepage condition. The 4 earthquake records in the far field condition have been applied horizontally to the bedrock as the input for dynamic analysis and then by considering the result of dynamic analysis was evaluated changing of the maximum acceleration and maximum displacement in time domain. In this study, to perform stability analysis and calculate the factor of safety, critical sliding surface on upstream and downstream that reported by the consultant engineers have been considered and then with Newmark analysis, equal dynamic safety factor, minimum safety factor and applied deformation have been evaluated. Results show that, the level of the water table has not effected on occurred maximum acceleration and maximum displacement. Moreover in critical sliding surface on downstream, with increasing level of the water table, dynamic factor of safety and minimum factor of safety have been increased. But in critical sliding surface on upstream, with increasing level of the water table to 0.6 height of dam, dynamic factor of safety and minimum factor of safety have been decreased and then have been increased.