Document Type : Research Article
University of Zanjan Department of Civil Engg.
Department of Civil Engineering, University of Zanjan
In the present paper, the effect of the sediment level of the dam reservoir on the nonlinear dynamic response of a concrete gravity dam under TNT explosion has been studied in a three-dimensional numerical model. For this purpose, assuming two different levels of sediments in the dam reservoir, the effect of its level on the dynamic behavior and the amount of damage on the concrete gravity dam has been investigated. The concrete damaged plasticity model (CDP), which includes the strain hardening/softening behavior of concrete, is applied in the modeling. In the analysis, the nonlinear dynamics of the dam-reservoir-foundation system utilizing ABAQUS software and finite element method have been used. CONWEP theory was used to apply the explosion load. As a case study, the failure analysis of the Koyna concrete gravity dam located in India under the TNT explosion has been evaluated. Analyzes were performed for three different blast points and two different amounts of explosives. The results obtained from the analysis show that the farther the blast location is from the sediments, the greater the displacement in the crown of the dam. Increasing the depth of sediment in the dam reservoir will cause stress and energy consumption and ultimately reduce the damage and displacement of the dam crown.