초록 열기/닫기 버튼
Failure of aged reservoir dams is one of the life threatening hazards. When an earth dam fails, the early stage of breached water contains a mixture of solid particles of various sizes and water. Due to high uncertainty in the phenomena of the dam failure and the debris flow of multiphase of water and soil, the dam breach has been studied mainly by shallow water approach of 2D flow for single phase of water. But the actual incidents of the earth dam failure have shown that the mixture of soil and water causes greater damages not only by flooding but also by structural damages due to the impact forces of the debris flow. Based on the previous study showing the potential validity to estimate the debris flow, this study models the failure of the earth dam using computational fluid dynamics of multiphase flow with nonlinear viscosity. First, the collapses of water and soil columns modeling simple earth dam are simulated, which shows the effects of the debris flow on the impact forces. The real collapse of Sandae reservoir is, then, simulated and the flooded region is compared with the previous studies of field survey. The results show some discrepancies due to uncertainties in both field study and the present computations; however, it shows that the breach of the earth dam can be modeled and simulated using the proposed method.
