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Study on the Fracture Law of Inclined Hard Roof and Surrounding Rock Control of Mining Roadway in Longwall Mining Face

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  • Feng Cui

    (School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Coal Resource Exploration and Comprehensive Utilization, Ministry of Land and Resources, Xi’an 710021, China)

  • Shuai Dong

    (School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Xingping Lai

    (School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Jianqiang Chen

    (Shenhua Xinjiang Energy Ltd., Wulumuqi 830027, China)

  • Chong Jia

    (School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Tinghui Zhang

    (School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China)

Abstract

In the inclination direction, the fracture law of a longwall face roof is very important for roadway control. Based on the W1123 working face mining of Kuangou coal mine, the roof structure, stress and energy characteristics of W1123 were studied by using mechanical analysis, model testing and engineering practice. The results show that when the width of W1123 is less than 162 m, the roof forms a rock beam structure in the inclined direction, the floor pressure is lower, the energy and frequency of microseismic (MS) events are at a low level, and the stability of the section coal pillar is better. When the width of W1123 increases to 172 m, the roof breaks along the inclined direction, forming a double-hinged structure, the floor pressure is increased, and the frequency and energy of MS events also increases. The roof gathers elastic energy release, and combined with the MS energy release speed it can be considered that the stability of the section coal pillar is better. As the width of W1123 increases to 184 m, the roof in the inclined direction breaks again, forming a multi-hinged stress arch structure, and the floor pressure increases again. MS high-energy events occur frequently, and are not conducive to the stability of the section coal pillar. Finally, through engineering practice we verified the stability of the section coal pillar when the width of W1123 was 172 m, which provides a basis for determining the width of the working face and section coal pillar under similar conditions.

Suggested Citation

  • Feng Cui & Shuai Dong & Xingping Lai & Jianqiang Chen & Chong Jia & Tinghui Zhang, 2020. "Study on the Fracture Law of Inclined Hard Roof and Surrounding Rock Control of Mining Roadway in Longwall Mining Face," Energies, MDPI, vol. 13(20), pages 1-22, October.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:20:p:5344-:d:427758
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    References listed on IDEAS

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    1. Feng Cui & Tinghui Zhang & Xingping Lai & Jiantao Cao & Pengfei Shan, 2019. "Study on the Evolution Law of Overburden Breaking Angle under Repeated Mining and the Application of Roof Pressure Relief," Energies, MDPI, vol. 12(23), pages 1-20, November.
    2. Feng Cui & Yanbin Yang & Xingping Lai & Chong Jia & Pengfei Shan, 2019. "Experimental Study on the Effect of Advancing Speed and Stoping Time on the Energy Release of Overburden in an Upward Mining Coal Working Face with a Hard Roof," Sustainability, MDPI, vol. 12(1), pages 1-23, December.
    3. Feng Cui & Shuai Dong & Xingping Lai & Jianqiang Chen & Jiantao Cao & Pengfei Shan, 2019. "Study on Rule of Overburden Failure and Rock Burst Hazard under Repeated Mining in Fully Mechanized Top-Coal Caving Face with Hard Roof," Energies, MDPI, vol. 12(24), pages 1-16, December.
    4. Jingjing Dai & Pengfei Shan & Qi Zhou, 2020. "Study on Intelligent Identification Method of Coal Pillar Stability in Fully Mechanized Caving Face of Thick Coal Seam," Energies, MDPI, vol. 13(2), pages 1-17, January.
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    Cited by:

    1. Xuming Zhou & Haotian Li & Xuelong Li & Jianwei Wang & Jingjing Meng & Mingze Li & Chengwei Mei, 2022. "Research on Gob-Side Entry Retaining Mining of Fully Mechanized Working Face in Steeply Inclined Coal Seam: A Case in Xinqiang Coal Mine," Sustainability, MDPI, vol. 14(16), pages 1-16, August.
    2. Yu Xiong & Dezhong Kong & Zhanbo Cheng & Zhijie Wen & Zhenqian Ma & Guiyi Wu & Yong Liu, 2021. "Instability Control of Roadway Surrounding Rock in Close-Distance Coal Seam Groups under Repeated Mining," Energies, MDPI, vol. 14(16), pages 1-19, August.

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