Abstract
To investigate why tailings piping break, identify the mechanisms of tailings dam breaches, and discover how mine tailings flood behave, a large-scale physical model of a tailings reservoir was constructed. The model tailings dam was breached and this breaching test was used to study dam breaching and the resulting tailings flood. The results show that a scour channel is formed in the dam by piping and then the upper portion of the dam collapses and lateral scour occurs. The breach goes through three stages: channel expansion, longitudinal undercutting, and transverse expansion. On the basis of these three stages, seven stages of dam breaching are proposed. The velocity of the tailings flood decreases logarithmically with distance. Three stages of dam breaking that include impact velocity, density, and burial depth are proposed based on a power function impact force model. Tailings flood undercut and erode near the dam and tailings are deposited farther away. The tailings flood direction changes at a bend and erosion occurs along the outer side of the bend while tailings are deposited near the inner side. Suggestions for tailings dam protection are put forward. The above research results provide an experimental and theoretical basis for disaster prevention and mitigation of tailings pond issues.
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The data used to support the findings of this study are available from the corresponding author upon request.
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Acknowledgements
This study was supported by the China Natural Science Foundation (Grant No. U19A2049, 51804178), National Key R&D Program of China (Grant No. 2017YFC0804607), and the Doctoral Scientific Research Foundation of Shandong Technology and Business University, China (BS202005). We thank Liwen Bianji, Edanz Editing China (www.liwenbianji.cn/ac), for editing the English text of a draft of this.
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Shuaifeng, W., Hong, C., Jianzhang, X. et al. Experimental study on discharge impact characteristics induced by piping failure of tailings dam. Arab J Geosci 14, 2054 (2021). https://doi.org/10.1007/s12517-021-08156-2
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DOI: https://doi.org/10.1007/s12517-021-08156-2