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Stability Assessment of a Tailings Pond Considering the Effect of Staged Construction and Embankment Raising Rate: a Numerical Study

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Abstract

The height of tailings pond (TP) embankments is frequently raised to accommodate the ever-increasing volume of tailings released by the mining industries. Excess pore water pressure (EPWP) may develop during the height-raising operations, which can affect the overall stability of TP. This article presents a detailed stability analysis for the embankments of an existing TP, the height of which was increased twice utilizing downstream (D/S) and upstream (U/S) construction techniques. A rigorous two-dimensional transient fully coupled-stress-pore pressure analysis is performed in the finite element-based package RS2 to examine the build-up of EPWP during different stages of construction. Furthermore, an attempt is made to investigate the feasibility of future height raising, with due consideration given to the influence of embankment raising rates. Results from the analysis show a development of higher EPWP within the tailings deposit in comparison to the embankments of TP, indicating the development of an undrained-like condition. The study further reveals that the development of EPWP is highly affected by the rate at which embankments of TP are being raised. A higher rate of embankment-raising results in the development of greater EPWP in comparison to a lower embankment-raising rate, which may lead to the ultimate collapse of TP. Furthermore, based on the stability analysis, the height of existing TP can be further raised by 4 m (two lifts of 2 m height) utilizing the U/S construction technique. A thorough cost and benefit analyses are however required before implementing the results of the current analysis since the storage capacity of TP is reduced while raising by the U/S method.

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Acknowledgements

The authors are thankful to International Coal Ventures Pvt. Ltd. (ICVL) for sharing all the data required in the present analyses. It would have been impossible to carry out the present work without the data received from ICVL.

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Authors and Affiliations

  1. Department of Civil Engineering, Indian Institute of Technology, Guwahati, 781039, India

    Surender Singh, Abhishek Kumar & T. G. Sitharam

  2. All India Council for Technical Education, New Delhi, 110070, India

    T. G. Sitharam

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  1. Surender Singh
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Correspondence to Abhishek Kumar.

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Singh, S., Kumar, A. & Sitharam, T.G. Stability Assessment of a Tailings Pond Considering the Effect of Staged Construction and Embankment Raising Rate: a Numerical Study. Mining, Metallurgy & Exploration 40, 851–869 (2023). https://doi.org/10.1007/s42461-023-00772-8

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