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Static and dynamic uniaxial compression tests on coal rock considering the bedding directivity

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Abstract

The mechanical properties and behavior of coal rock under both static and dynamic loading rates are of importance in the coal mining practices. In this study, both quasi-static and dynamic uniaxial compression tests are conducted on coal rock, considering the bedding directivity of coal rocks using a MTS hydraulic servo-control testing machine and split Hopkinson pressure bar (SHPB), respectively. The attained strain rates range from 10−5 to 10−2 s−1 for static tests and 20 to 100 s−1 for dynamic SHPB tests. For dynamic tests, pulse-shaping technique is utilized to achieve dynamic force balance and thus validate the quasi-static data reduction. A high-speed camera is used to capture the failure process in SHPB tests. The characteristics of failure mode, fracture strength, energy dissipation, and fractal dimension are investigated. A significant strain-rate-dependent behavior of coal rock is revealed, and the compressive strength, elasticity modulus and energy consumption increase with increasing strain rate. The bedding effect on the coal behavior at static strain rate is more prominent than that at dynamic strain rate. The measured strengths along different bedding directions exhibit distinct variations, featuring significant anisotropy. In addition, a sieving statistics analysis of the recovered fragments depicts obvious fractal; and the fracture dimension can be correlated to the fractal energy dissipation.

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Acknowledgments

The authors are grateful for the financial support from the National Program on Key Basic Research Project (No. 2011CB201201, No. 2015CB057903) and the financial support from the National Natural Science Foundation of China (Nos. 51374149, 51204113,51134018).F. Dai acknowledges the support of the Program for New Century Excellent Talentsin University (NCET-13-0382) and Youth Science and Technology Fund of Sichuan Province (2014JQ0004).

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Authors and Affiliations

  1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu, 610065, Sichuan, China

    Xiaohui Liu, Feng Dai, Ru Zhang & Jianfeng Liu

  2. School of Energy and Power Engineering, Key Laboratory of Fluid and Power Machinery, Xihua University, Ministry of Education, Chengdu, 610039, Sichuan, China

    Xiaohui Liu

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  1. Xiaohui Liu
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  2. Feng Dai
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  4. Jianfeng Liu
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Correspondence to Feng Dai.

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Liu, X., Dai, F., Zhang, R. et al. Static and dynamic uniaxial compression tests on coal rock considering the bedding directivity. Environ Earth Sci 73, 5933–5949 (2015). https://doi.org/10.1007/s12665-015-4106-3

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  • DOI: https://doi.org/10.1007/s12665-015-4106-3

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