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

Yu-ye Tan; Xin Yu; Davide Elmo; Lin-hui Xu; Wei-dong Song

doi:10.1007/s12613-019-1749-1

Volume 26 Issue 4

Apr. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(4): 404-416

Yu-ye Tan, Xin Yu, Davide Elmo, Lin-hui Xu, and Wei-dong Song, Experimental study on dynamic mechanical property of cemented tailings backfill under SHPB impact loading, Int. J. Miner. Metall. Mater., 26(2019), No. 4, pp. 404-416. https://doi.org/10.1007/s12613-019-1749-1

Cite this article as:

Yu-ye Tan, Xin Yu, Davide Elmo, Lin-hui Xu, and Wei-dong Song, Experimental study on dynamic mechanical property of cemented tailings backfill under SHPB impact loading, Int. J. Miner. Metall. Mater., 26(2019), No. 4, pp. 404-416. https://doi.org/10.1007/s12613-019-1749-1

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Research Article

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

+ Author Affiliations

Corresponding author:
Davide Elmo E-mail: delmo@mail.ubc.ca
Received: 2 November 2018; Revised: 11 January 2019; Accepted: 22 January 2019

Abstract

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.
- impact loading test;
- cemented tailings backfill;
- dynamic mechanical properties;
- split Hopkinson pressure bar

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