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Research on Overburden Movement Characteristics of Large Mining Height Working Face in Shallow Buried Thin Bedrock

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  • Qingxiang Huang

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

  • Yanpeng He

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

Abstract

The overburden movement of the large mining height working face of shallow buried thin bedrock (SBTB) is a complex engineering problem with “time-space-intension”, which is of great significance to realize efficient and safe mining in the northern Shaanxi mining area. Based on the research object of No. 22201 working face in Zhangjiamao Coal Mine, the roof structure characteristics of large mining height working face in SBTB are researched by field drilling measurement, laboratory test, physical and numerical simulation. The results show that: (1) Based on the measured data of the drillholes, it is concluded that under the mining conditions of SBTB with large mining height, the roof movement is ahead of the weighting of the working face, and the working resistance has a significant time effect. The advanced movement distance is about 20 m, which can be used as an early warning index of the weighting. The lag movement distance in the roof with horizon of 30 m is two periodic weighting intervals, which are about 26 m. (2) The first weighting interval of the working face is 32 m. The roof first break has obvious step sinking phenomenon, and the measured surface appears at a position 45 m away from the transport slot. It is statistically concluded that the periodic weighting interval is 9.5~16.5 m, the average weighting interval is 13 m, which is equivalent to the periodic dynamic crack spacing of the surface. (3) The results of field measurement and physical simulation show that the breaking angle of the roof of the No. 22201 large mining height is about 66°, and the periodic stepping distance of the T-junction suspension area is 6~8m. Along the strike of the working face, the roof breaking is mainly arc arched. The research results ensure the safe and green mining of shallow coal seam.

Suggested Citation

  • Qingxiang Huang & Yanpeng He, 2019. "Research on Overburden Movement Characteristics of Large Mining Height Working Face in Shallow Buried Thin Bedrock," Energies, MDPI, vol. 12(21), pages 1-22, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:21:p:4208-:d:283498
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    References listed on IDEAS

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    1. Dawid Szurgacz & Jarosław Brodny, 2019. "Analysis of the Influence of Dynamic Load on the Work Parameters of a Powered Roof Support’s Hydraulic Leg," Sustainability, MDPI, vol. 11(9), pages 1-13, May.
    2. Qingxiang Huang & Yanpeng He & Jian Cao, 2019. "Experimental Investigation on Crack Development Characteristics in Shallow Coal Seam Mining in China," Energies, MDPI, vol. 12(7), pages 1-16, April.
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    Cited by:

    1. Zijie Hong & Zhenhua Li & Feng Du & Zhengzheng Cao & Chun Zhu, 2023. "Study on the Evolution Law of Deep Rock Cracks and the Mechanism of Graded Gradient Support," Energies, MDPI, vol. 16(3), pages 1-12, January.
    2. Yanpeng He & Qingxiang Huang, 2023. "Simulation Study on Spatial Form of the Suspended Roof Structure of Working Face in Shallow Coal Seam," Sustainability, MDPI, vol. 15(2), pages 1-20, January.
    3. Qingxiang Huang & Yanpeng He & Feng Li, 2020. "Research on the Roof Advanced Breaking Position and Influences of Large Mining Height Working Face in Shallow Coal Seam," Energies, MDPI, vol. 13(7), pages 1-15, April.
    4. Xiaoping Shao & Xin Li & Long Wang & Zhiyu Fang & Bingchao Zhao & Ershuai Liu & Yeqing Tao & Lang Liu, 2020. "Study on the Pressure-Bearing Law of Backfilling Material Based on Three-Stage Strip Backfilling Mining," Energies, MDPI, vol. 13(1), pages 1-16, January.

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