Numerical Analysis of Sand Bed Degrading and Sediment Transport Rate Under Tailings Dam Break

Abstract

Dam-breaking accidents in tailings ponds may result in loss of tailings, damage to the downstream bridges and houses, flooding of farmland and roads, hazards to the local environment, and even loss of property and lives. Therefore, research on dam breaks in tailings reservoirs and prediction of subsequent impacts are of great significance. This paper describes theoretical and numerical analyses of the retrogressive erosion model and calculations of the sand bed surface profile and sediment transport rate following tailings dam break events. The calculation results show that the degrading rate of the bed surface in the reservoir area reaches a maximum when the breach is formed and then rapidly decreases to a stable value. Farther away from the breach, the peak degrading rate of the bed surface is lower. The time of the peak tailings outflow rate is related to the formation of the breach. A larger breach has a shorter formation time and a greater peak flow.

Experimental study on whole process of river blockage and dam break under different hydrodynamic conditions

“…Although the cost of this kind of experiment is high, this can better meet similar conditions, and the obtained test results are more similar to the prototype phenomenon, making this a better research method. Other approaches were performed through the establishment of the mathematical and physical model of a dam, and a highperformance computer simulates the dam breaking process, including the evolution process of breaches and floods (Cristofano, 1973;Fread, 1988;Chang and Zhang, 2010;Liu, 2018;Luo et al, 2019;Ruan et al, 2021;Tian et al, 2021;Zhang et al, 2021). However, these models have high simulation accuracy only when the input parameters are sufficiently large and accurate (Zhong et al, 2021).…”