Analysis of the Dynamic Stability of Tailing Dams: An Experimental Study on the Dynamic Characteristics of Tailing Silt

Author:

Kang Fuqi12,Wang Guangjin12,Li Yaoji3,Cai Binting3,Li Shujian3ORCID,Zhao Lei3,Li Xiaoshuang4ORCID

Affiliation:

1. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China

2. Yunnan International Technology Transfer Center for Mineral Resources Development and Solid Waste Resource Utilization, Kunming 650093, China

3. Yunnan Phosphate Chemical Group Co., Ltd., Kunming 650600, China

4. School of Urban Construction, Changzhou University, Changzhou 213164, China

Abstract

With the improvement in tailing mining-grade requirements and in mineral processing technology, tailing materials tend to be fine-grained. Under the action of earthquakes, a tailing dam is prone to liquefaction, which endangers the safety and stability of the dam. To further explore the dynamic properties of tailing silt under cyclic stress, through a series of dynamic triaxial experiments, we investigated the growth of the hysteresis curve, the development of pore pressure, and the energy dissipation law of tailing silt. The experimental findings indicated that increasing the density of the sample significantly improves its liquefaction resistance and the pore pressure development curve can be fitted using the BiDoseResp function. At the same cyclic stress ratio, the sample’s anti-liquefaction strength did not rise monotonically with increasing confining pressure but changed variably at values near a specified low confining pressure; when the sample density rose under the same settings, the specific confining pressure reduced. We also further discussed the evolution law of the stress–strain curves of tailing silt. The results further explored the dynamic characteristics of tailing silt, which can provide some reference for the seismic design and reinforcement measures of many fine-grained tailing dams.

Funder

National Natural Science Foundation of China

Yunnan International Technology Transfer Center for Mineral Resources Development and Solid Waste Resource Utilization

Publisher

MDPI AG

Subject

Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science

Reference23 articles.

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2. Lin, S.Q., Wang, G.J., Liu, W.L., Zhao, B., Shen, Y.M., Wang, M.L., and Li, X.S. (2022). Regional distribution and causes of global mine tailings dam failures. Metals, 12.

3. Reported tailings dam failures: A review of the European incidents in the worldwide context;Rico;J. Hazard. Mater.,2008

4. Rascol, E. (2009). Cyclic Properties of Sand: Dynamic Behaviour for Seismic Applications, EPFL.

5. Fundão tailings dam failures: The environment tragedy of the largest technological disaster of Brazilian mining in global context;Kamino;Perspect. Ecol. Conserv.,2017

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