![]() (2) The relationship curve between particle size and erosion rate showed that when the particle size changed from small to large, the gradient of erosion rate changed from large to small. The analysis drew the following conclusions: (1) With the same sediment concentration and flow velocity, the smaller the particle size was, the greater the erosion rate was. The average erosion rate was calculated and the line chart was drawn by measuring the erosion height and erosion time of tailings samples and repeating the test. Tailings of Nanchuan in Chongqing and Xiaoda Goose in Yunnan were used to screen out five different particle sizes (0.075, 0.106, 0.150, 0.250, and 0.425 mm) and proportioned into a sediment laden flow with a concentration of 5% for tailings erosion test. The self-made test system for erosion characteristics and scouring process of soil slope under complex hydrodynamic conditions was used. Based on the mechanics of sediment movement, the influence of different particle sizes on the erosion rate of tailings dam in sediment laden flow was studied by means of indoor test and mathematical induction. There are numerous safety problems of tailings pond in China, and overtopping dam break accidents occur frequently.
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