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Study on Rationality of Large Diameter Pressure Relief Drilling Parameters Under Different Coal Seam Conditions

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Abstract

To study the influence of changes in the coal seam mechanical characteristics at depth on the stress relief effect of a borehole, this paper established the relationships between the borehole spacing, elastic modulus, and Poisson’s ratio of the coal seam. It then analyzed the stress relief effect of different borehole spacings in different coal qualities in a deep coal seam, using the FLAC3D numerical simulation software. The results indicated that after boreholes with different spacings were drilled in the deep coal seam, the peak stress value of the roadway-surrounding rock was transferred to the deep coal body, and the original peak stress position was reduced to varying degrees. Under the premise of ensuring the stress relief effect and improving stress relief efficiency, the relationship between borehole spacing and the elastic modulus of the coal seam was a negative exponential function, whereas the spacing of boreholes and Poisson’s ratio of the coal seam had a logarithmic function relationship. The research conclusions were applied to the − 1000 West No. 1 mining area in the Tangkou coal mine, which achieved good stress relief results.

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Acknowledgements

We gratefully acknowledge the financial supported by “the Fundamental Research Funds for the Central Universities” [2018BSCXC29]; Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX17_1558].

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Authors and Affiliations

  1. Institute of Mining Engineering, Shandong University of Science and Technology, Tai’an, 271019, China

    Zhigang Liu & Shang Wenzheng

  2. China Railway Shisiju Group Corporation, Jinan, 250013, Shandong, China

    Zhikang Wang

  3. Shandong Energy Group, Jinan, 250013, China

    Zhigang Liu, Ruoxiang Zhang & Xikui Sun

  4. A Key Laboratory of Deep Coal Resource Mining, School of Mines, Ministry of Education of China, China University of Mining and Technology, Xuzhou, 221116, China

    Zhigang Liu

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  1. Zhigang Liu
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  2. Zhikang Wang
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Correspondence to Shang Wenzheng.

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Liu, Z., Wang, Z., Zhang, R. et al. Study on Rationality of Large Diameter Pressure Relief Drilling Parameters Under Different Coal Seam Conditions. Geotech Geol Eng 40, 5425–5436 (2022). https://doi.org/10.1007/s10706-022-02223-5

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  • DOI: https://doi.org/10.1007/s10706-022-02223-5

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