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Dynamic mechanical properties of an ore rock with varying grade and engineering applications in mines

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Abstract

The dynamic mechanical properties of ore rock are important in blast designs and support designs for underground mines. However, few studies have focused on ore rock with varying grade, and the application of such studies to production in underground mines is rather limited. In this study, Split Hopkinson pressure bar (SHPB) tests were conducted on ore rock with varying grades. Images were recorded using high-speed cameras, and a digital image correlation method was used to reveal the process of compressive stress wave propagation and crack development during the tests. Experimental SHPB tests were also simulated using particle flow code, which reproduced the main dynamic characteristics of ore rock subjected to these tests. Blast simulation was induced by ball expansion, and a large-scale rock–backfill model was used to assess the effect of stress waves induced by blasting on backfills. Results revealed the relation between content of metallic minerals and the dynamic mechanical behavior of ore rock with varying grade. Response surface analysis for achieving a balance between safety and profit provided a basis for optimizing the burden between the bottom of blast holes and backfills in underground mines, especially for ore rock with varying grade.

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Funding

This research was supported by National Natural Science Foundation of China (Grant 51674015) and China Scholarship Council (Grant 201806460044).

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Authors and Affiliations

  1. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science and Technology Beijing, Beijing, 100083, China

    Bing Liu, Yong-Tao Gao & Ai-Bing Jin

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  1. Bing Liu
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  2. Yong-Tao Gao
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  3. Ai-Bing Jin
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Correspondence to Ai-Bing Jin.

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Liu, B., Gao, YT. & Jin, AB. Dynamic mechanical properties of an ore rock with varying grade and engineering applications in mines. Engineering with Computers 38 (Suppl 3), 2433–2445 (2022). https://doi.org/10.1007/s00366-021-01394-8

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  • DOI: https://doi.org/10.1007/s00366-021-01394-8

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