Abstract:This article takes a tailings pond in Miyi County, Panzhihua City, Sichuan Province as the research object. FLO-2D numerical simulation software is used to simulate tailings ponds with different forms of dam failure, and the results are compared and analyzed to determine the impact range of dam failure and ensure the personal and property safety of downstream residents. By calculating the flood overtopping parameters of tailings pond, the dam failure parameters of single point instantaneous dam failure and multi point instantaneous dam failure, and substituting them into FLO-2D software, the corresponding numerical simulation results are finally obtained. The results show that under all forms of dam failure, single point dam failure causes the most accumulation and destruction, with most of the tail fine sand and tail powder sand concentrated in the rear section of the main dam. In contrast, multi point instantaneous dam failure has weaker damage to the affected area, and the degree of disaster is relatively mild. However, the affected surface area significantly increases, and the tail sand deposition is the widest, mainly distributed in the initial dam and flooded areas of each dam body; However, due to the minimum flow rate of dam failure caused by flood overtopping, compared to instantaneous dam failure, the damage is relatively small and the affected area is the smallest. Tailings are mainly deposited in the river channel, but it should be noted that when accompanied by a large amount of rainfall, this disaster may also cause other secondary disasters.
