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Experimental study on dynamic mechanical property of cemented tailings backfill under SHPB impact loading

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Abstract

Cemented tailings backfill (CTB) have increasingly been used in recent years to improve the stability of mining stopes in deep underground mines. Deep mining processes are often associated with rock bursting and high-speed dynamic loading conditions. Therefore, it is important to investigate the characteristics and dynamic mechanical behavior of CTB. This paper presents the results of dynamic tests on CTB specimens with different cement and solid contents using a split Hopkinson pressure bar (SHPB). The results showed that some CTB specimens exhibited one to two lower stress peaks after reaching dynamic peak stress before they completely failed. The greater the cement-to-tailings ratio is, the more obvious the strain reaction. This property mainly manifested as follows. First, the dynamic peak stress increased with the increase of the cement-to-tailings ratio when the impact velocity was fixed. Second, the dynamic peak stress had a quadratic relationship with the average stress rate. Third, the cement-to-tailings ratio could enhance the increase rate of dynamic peak stress with strain rate. In addition, the dynamic strength enhancement factor K increased with the increase of strain rate, and its value was larger than that of the rock samples. The failure modes of CTB specimens under low-speed impact were tensile failure and X conjugate shear failure, where were nearly the same as those under static uniaxial and triaxial compression. The CTB specimens were crushed and broken under critical strain, a failure mode similar to that of low-strength concrete. The results of the experimental research can improve the understanding of the dynamic mechanical properties of CTB and guide the strength design of deep mining backfills.

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Acknowledgements

This work was financially supported by the National Key R&D Program of China (No. 2018YFC0604602), the Fundamental Research Funds for the Central Universities of China (No. FRF-TP-17-029A2), and the Open fund of Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education of China (No. ustbmslab201803).

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Authors and Affiliations

  1. Key Laboratory of High-Efficient Mining and Safety of Metal Mines (Ministry of Education of China), University of Science and Technology Beijing, Beijing, 100083, China

    Yu-ye Tan, Xin Yu, Lin-hui Xu & Wei-dong Song

  2. School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Yu-ye Tan, Xin Yu, Lin-hui Xu & Wei-dong Song

  3. Norman B. Keevil Institute of Mining Engineering, Applied Science School, University of British Columbia, Vancouver, V6T 1Z4, BC, Canada

    Davide Elmo

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  1. Yu-ye Tan
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Correspondence to Davide Elmo.

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Tan, Yy., Yu, X., Elmo, D. et al. Experimental study on dynamic mechanical property of cemented tailings backfill under SHPB impact loading. Int J Miner Metall Mater 26, 404–416 (2019). https://doi.org/10.1007/s12613-019-1749-1

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  • DOI: https://doi.org/10.1007/s12613-019-1749-1

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