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Stability of goaf-side entry driving in 800-m-deep island longwall coal face in underground coal mine

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Abstract

Goaf-side entry driving in underground coal mines could greatly improve coal recovery rates. However, it becomes more difficult to maintain stability, especially in deep coal mines. Pillar width plays a pivotal role in the stability of goaf-side entry driving. To obtain a reasonable and appropriate narrow pillar width, theoretical calculations of the widths of mining-damaged zone and limit equilibrium zone in the pillar are derived according to limit equilibrium theory. Based on the stability issues of goaf-side entry driving in the first island longwall coal face (LCF) at a depth of 800 m below the surface in Guqiao Coal Mine in China, a numerical model is established by FLAC software to analyze the stability of the surrounding rock of goaf-side entry driving during excavation, using various coal pillar widths and support schemes. The results obtained from theoretical calculations, numerical simulation, and engineering practice indicate that an 8-m-wide coal pillar is relatively reasonable, appropriate, and feasible. Field measurements show that deformations of the surrounding rock could be efficiently controlled 31 days after the support schemes were implemented in goaf-side entry driving with an 8-m-wide narrow pillar along the adjacent goaf side with a compaction duration of 10 months. The mining influence range of the overlying LCF on the stability of goaf-side entry driving is found to be the area from 50 m ahead of the LCF to 70 m behind the LCF as it passes over the measurement point.

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Acknowledgments

This study was sponsored by the Program for Changjiang Scholars and Innovative Research Team in University (IRT1084), the State Scholarship Fund from China Scholarship Council (201206420001), the National Natural Science Foundation of China (NSFC) (Grant No. 51574224 and No. 51574226) and Global Center of Excellence Program on Novel Carbon Resource Sciences launched by the Ministry of Education, Culture, Sports, Science and Technology (MEXT). The authors would like to express appreciation to Associate Professor Jiaguang Kan and Mr. Chengli Xiao at the China University of Mining and Technology and the staff at Guqiao Coal Mine for their support and assistance during the field measurements.

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Authors and Affiliations

  1. Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka, 819-0395, Japan

    Deyu Qian, Hideki Shimada & Takashi Sasaoka

  2. School of Mines, China University of Mining and Technology, Xuzhou, 221116, China

    Deyu Qian, Nong Zhang & Nianchao Zhang

  3. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454000, China

    Cheng Wang

  4. School of Earth Sciences, University of Queensland, St Lucia, Queensland, 4072, Australia

    Nianchao Zhang

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  1. Deyu Qian
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  2. Nong Zhang
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  3. Hideki Shimada
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  4. Cheng Wang
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  5. Takashi Sasaoka
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  6. Nianchao Zhang
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Correspondence to Deyu Qian.

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Qian, D., Zhang, N., Shimada, H. et al. Stability of goaf-side entry driving in 800-m-deep island longwall coal face in underground coal mine. Arab J Geosci 9, 82 (2016). https://doi.org/10.1007/s12517-015-2119-6

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  • DOI: https://doi.org/10.1007/s12517-015-2119-6

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