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Article

Investigation on Dynamical Mechanics, Energy Dissipation, and Microstructural Characteristics of Cemented Tailings Backfill under SHPB Tests

by 1,2, 1,2, 1,2,*, 1,2 and 3
1
School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China
3
State Key Laboratory for Nonlinear Mechanics (LNM) Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
*
Author to whom correspondence should be addressed.
Academic Editor: Abbas Taheri
Received: 24 April 2021 / Revised: 13 May 2021 / Accepted: 14 May 2021 / Published: 19 May 2021
(This article belongs to the Special Issue Backfilling Materials for Underground Mining, Volume II)
As mining depth increases, the backfill mining method is more and more widely used in underground mines. The dynamic load generated by the blasting can affect the stability of the cemented tailings backfill (CTB). The CTB samples were prepared to conduct a test of the split Hopkinson pressure bar (SHPB) to investigate the dynamic disturbance of CTB. The present paper discusses dynamical mechanics, energy dissipation, and microstructure analysis of CTB. Micro-computer tomography (micro-CT) scanning of CTB samples after the SHPB test was performed to analyze the evolution of internal cracks. The experimental results showed that when the average strain rate (ASR) increased from 30 to 98 s−1, the dynamic uniaxial compression strength (DUCS) of the CTB showed a trend of first increasing and decreasing with the increase in ASR. The dynamic stress–strain pre-peak curve of CTB directly enters the linear elastic stage. As ASR increases, the absorbed energy of the CTB shows a trend of first increasing and then decreasing. Moreover, according to the micro-CT scanning results, the crack area of CTB accounts for about 16% of the sample near the incident bar and about 1% near the transmitted bar. The crack area ratio is exponentially related to the specimen height. These findings can provide reasonable dynamical CTB strength data selection for underground pillar mining. View Full-Text
Keywords: cemented tailings backfill (CTB); split Hopkinson pressure bar (SHPB); dynamical characteristics; energy dissipation; micro-computer tomography cemented tailings backfill (CTB); split Hopkinson pressure bar (SHPB); dynamical characteristics; energy dissipation; micro-computer tomography
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MDPI and ACS Style

Zheng, D.; Song, W.; Cao, S.; Li, J.; Sun, L. Investigation on Dynamical Mechanics, Energy Dissipation, and Microstructural Characteristics of Cemented Tailings Backfill under SHPB Tests. Minerals 2021, 11, 542. https://0-doi-org.brum.beds.ac.uk/10.3390/min11050542

AMA Style

Zheng D, Song W, Cao S, Li J, Sun L. Investigation on Dynamical Mechanics, Energy Dissipation, and Microstructural Characteristics of Cemented Tailings Backfill under SHPB Tests. Minerals. 2021; 11(5):542. https://0-doi-org.brum.beds.ac.uk/10.3390/min11050542

Chicago/Turabian Style

Zheng, Di, Weidong Song, Shuai Cao, Jiajian Li, and Lijuan Sun. 2021. "Investigation on Dynamical Mechanics, Energy Dissipation, and Microstructural Characteristics of Cemented Tailings Backfill under SHPB Tests" Minerals 11, no. 5: 542. https://0-doi-org.brum.beds.ac.uk/10.3390/min11050542

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