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Investigating the Width of Isolated Coal Pillars in Deep Hard-Strata Mines for Prevention of Mine Seismicity and Rockburst

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  • Bo Wang

    (School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China)

  • Sitao Zhu

    (School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China
    Shandong Energy Group Company Limited, Jinan 250014, China)

  • Fuxing Jiang

    (School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China)

  • Jinhai Liu

    (Hebei State Key Laboratory of Mine Disaster Prevention, North China Institute of Science and Technology, Beijing 101601, China)

  • Xiaoguang Shang

    (School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China)

  • Xiufeng Zhang

    (Shandong Energy Group Company Limited, Jinan 250014, China)

Abstract

In deep mines, a reasonable design of the widths of isolated coal pillars (ICPs) is critically important, particularly for hard-strata mines. This is because the frequent occurrence of mine seismicity (MS) and rockburst in deep mines often arises from the inappropriate widths of the remnant ICPs. To address this problem, this paper takes the ICP of Yingpanhao Coal Mine in Inner Mongolia in China as the engineering case study and then presents a mechanical model to illuminate the occurrence mechanism of MS induced by the mining on both sides of ICPs. The results indicate that, after the mining on both sides of ICPs, the ICPs will produce a vertical compressive deformation, and the overlying high main key stratum (MKS) will experience a flexure deformation. When the limited deflection of MKS is less than the compression of ICPs, the MKS will be fractured, and the released energy may lead to MS. Based on the mechanism model, a design criterion is proposed for ICP widths; this criterion can effectively reduce the risk of the induced rockburst and MS. Then the occurrence mechanism of MS and the design basis for ICP width are verified by numerical simulation and field microseismic monitoring. The results in this paper may be used as a theoretical guidance for rational ICP design in deep mines and may help mitigate the risk of rockburst and MS from early mining stages.

Suggested Citation

  • Bo Wang & Sitao Zhu & Fuxing Jiang & Jinhai Liu & Xiaoguang Shang & Xiufeng Zhang, 2020. "Investigating the Width of Isolated Coal Pillars in Deep Hard-Strata Mines for Prevention of Mine Seismicity and Rockburst," Energies, MDPI, vol. 13(17), pages 1-18, August.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:17:p:4293-:d:401173
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    References listed on IDEAS

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    1. Guorui Feng & Pengfei Wang & Yoginder P. Chugh, 2018. "A New Gob-Side Entry Layout for Longwall Top Coal Caving," Energies, MDPI, vol. 11(5), pages 1-24, May.
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    3. Shengquan He & Dazhao Song & Zhenlei Li & Xueqiu He & Jianqiang Chen & Taoping Zhong & Quan Lou, 2020. "Mechanism and Prevention of Rockburst in Steeply Inclined and Extremely Thick Coal Seams for Fully Mechanized Top-Coal Caving Mining and Under Gob Filling Conditions," Energies, MDPI, vol. 13(6), pages 1-26, March.
    4. Manchao He & Yubing Gao & Jun Yang & Weili Gong, 2017. "An Innovative Approach for Gob-Side Entry Retaining in Thick Coal Seam Longwall Mining," Energies, MDPI, vol. 10(11), pages 1-22, November.
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