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With the economic development and industrialization, the increasingly accumulated tailings ponds in China have become a great risk. Due to the difficulty of selecting proper site for a new reservoir in Yunnan, a sub-dam was built at the downstream original reservoir. This study explored the fracture development and progressive failure characteristi...
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... by lifting the test device and for each time, the lifting angle was 1° and the static time was 3 min. The industrial camera recorded in real-time images during the lifting process. The raw tailings were used as the test material, with a dry density of 1.92 g/cm 3 and a moisture content of 12.3%. The particle composition is shown in Table 1. Fig. 4. The fracture network can be identified and the geometric characteristics of the fracture can be calculated by the "regionprop" function of MATLAB software. In this experiment, the maximum long axis length and the maximum short axis length of the tailings fracture (the maximum long axis and the short axis length of the ellipse with the ...Similar publications
As the most severe damage form of tailings ponds, dam failure causes a serious threat and damage to the surrounding lives and environment. Therefore, based on the systematic collection and consultation of relevant data at home and abroad, the literature source analysis on tailings dam failure disasters is conducted using the CiteSpace scientometric...
Citations
... Chang et al. (2022) pointed out that the initial sliding point of the tailing dam was located at the crack in the lower part of the dam body, and then, a scarp was formed, resulting in the vertical and then horizontal development of the breach. Zhang et al. (2022) found that the maximum shear stress first occurs at the foot or top of the dam and then extends to the top of the dam in the form of a curve to form a failure surface. Wang et al. (2022b) studied the process and failure mechanisms of breach expansion under the overall rainfall conditions. ...
There is a high risk of dam breakage in tailing reservoirs under extreme conditions. Once a dam breaks, it causes serious pollution to the surrounding ecological environment. To explore the effects of a tailings dam break under extreme conditions (flood conditions, drainage failure, flood discharge failure, and dam saturation), the mechanism underlying an overtopping dam break must be accurately understood. In this study, fine-grained tailings and perlite were selected to create composite model sand, and a prototype tailing reservoir was restored at a scale of 1:200. Furthermore, the dam-break process and results were analyzed and summarized by performing an overtopping dam-break test on the tailing reservoir under extreme conditions. The results show that the tailing discharge process has a high sand content, strong sand-carrying capacity, and high speed. The amount of model sand discharge accounted for 15.13% of the total storage capacity, and the amount of tailings deposition in the downstream area accounted for 95.21% of the discharge, which were both greater than the results of similar physical model tests and actual tailings dam failure accidents. An overtopping dam break in a tailing pond is a progressively destructive process. The dam break mechanism can be divided into two stages: prior breach penetration and subsequent breach horizontal expansion. In the process of a tailings dam break, the motion state of the tailings particles is transformed between the bed-load and suspended-load movement states. These results can provide important reference for the reinforcement of mine management and the formulation of preventive measures, which are essential to improving the safety of tailings reservoirs and protecting the ecological environment.
