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Fragmentation Characteristics Analysis of Sandstone Fragments for Impact Rockburst Under Different Dynamic Loading Frequency

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Abstract

This study used a self-developed rockburst-inducing system to apply dynamic load at different frequencies to true triaxially loaded sandstone specimens pierced by a central hole. After failure, the sandstone fragments generated were collected, as were those generated by a similar compression experiment where only static load was applied. The quantity of fragments falling within coarse, medium, fine and micro-scale size ranges and the mass distribution were analyzed. Image processing software was then used to process images of the medium grains, and the measurements obtained were used to calculate the fractal dimensions of the granularity–quantity, perimeter length–quantity and area–quantity relationships. The experimental results show that fine and micro-grains make up a higher proportion of the fragmented mass when the dynamic loading frequency is higher. Fractal analysis of medium grains shows that the fractal dimension increases with an increase in dynamic loading frequency. The degree of crushing in impact rockburst experiments is found to be higher than in the compression experiment.

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Acknowledgements

This work is supported by the National Key Research and Development Program Grant (No. 2016YFC0600901) and National Natural Science Foundation of China (No. 51704298).

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics and Deep Underground Engineering, Beijing, 100083, China

    Yang Wang, Zhu Chun, Manchao He, Dongqiao Liu, Youwen Lin & Shaolei Du

  2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, 100083, China

    Yang Wang, Zhu Chun, Youwen Lin & Shaolei Du

  3. College of Construction Engineering, Jilin University, Changchun, 130026, China

    Zhu Chun

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  1. Yang Wang
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  2. Zhu Chun
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  3. Manchao He
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  4. Dongqiao Liu
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  5. Youwen Lin
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  6. Shaolei Du
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Correspondence to Zhu Chun.

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Wang, Y., Chun, Z., He, M. et al. Fragmentation Characteristics Analysis of Sandstone Fragments for Impact Rockburst Under Different Dynamic Loading Frequency. Geotech Geol Eng 37, 2715–2727 (2019). https://doi.org/10.1007/s10706-018-00789-7

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  • DOI: https://doi.org/10.1007/s10706-018-00789-7

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