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In Situ Studies on the Characteristics of Strata Structures and Behaviors in Mining of a Thick Coal Seam with Hard Roofs

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  • Yiwen Lan

    (Key Laboratory of Deep Coal Resource Mining, School of Mines, Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, China
    Datong Coal Mine Group Co. Ltd., Datong 037000, China)

  • Rui Gao

    (College of Mining Engineering, Taiyuan University of Technology, Shanxi 030024, China)

  • Bin Yu

    (Key Laboratory of Deep Coal Resource Mining, School of Mines, Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, China
    Datong Coal Mine Group Co. Ltd., Datong 037000, China)

  • Xiangbin Meng

    (Datong Coal Mine Group Co. Ltd., Datong 037000, China)

Abstract

The movements of overburden induced by mining a thick coal seam with a hard roof extend widely. The effects of breakages in the hard strata on the strata behaviors might vary with the overlying strata layers. For this reason, we applied a test method that integrated a borehole TV tester, borehole-based monitoring of strata movement, and monitoring of support resistance for an in situ investigation of a super-thick, 14–20 m coal seam mining in the Datong mining area in China. The results showed that the range of the overburden movement was significantly high, which could reach to more than 300 m. The key strata (KS) in the lower layer main roof were broken into a ‘cantilever beam and voussoir beam’ structure. This structure accounted for the ‘long duration and short duration’ strata behaviors in the working face. On the other hand, the hard KS in the upper layer broke into a ‘high layer structure’. The structural instability induced intensive and wide-ranging strata behaviors that lasted for a long time (two to three days). Support in the working face were over-pressured by large dynamic factors and were widely crushed, while the roadways were violently deformed. Hence, the structure of a thick coal seam with a hard roof after mining will form a ‘cantilever beam and voussoir beam and high layer structure’, which is unique to a large space stope.

Suggested Citation

  • Yiwen Lan & Rui Gao & Bin Yu & Xiangbin Meng, 2018. "In Situ Studies on the Characteristics of Strata Structures and Behaviors in Mining of a Thick Coal Seam with Hard Roofs," Energies, MDPI, vol. 11(9), pages 1-10, September.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2470-:d:170339
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    References listed on IDEAS

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    1. Wu Cai & Linming Dou & Siyuan Gong & Zhenlei Li & Shasha Yuan, 2015. "Quantitative analysis of seismic velocity tomography in rock burst hazard assessment," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 75(3), pages 2453-2465, February.
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    Cited by:

    1. Chunde Piao & Shaogang Lei & Jiakun Yang & Lihong Sang, 2018. "Experimental Study on the Movement and Evolution of Overburden Strata Under Reamer-Pillar Coal Mining Based on Distributed Optical Fiber Monitoring," Energies, MDPI, vol. 12(1), pages 1-12, December.
    2. Kaijun Miao & Dapeng Wang & Shihao Tu & Hongsheng Tu & Defu Zhu & Xuewen Liu & Wenlong Li & Long Tang, 2022. "The Principle and Practice of Strong Mine Pressure Control in the Initial Mining and Caving Stages under Multiple Key Strata," Sustainability, MDPI, vol. 14(10), pages 1-14, May.

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