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Strata Movement and Mining-Induced Stress Identification for an Isolated Working Face Surrounded by Two Goafs

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  • Yingyuan Wen

    (School of Mines, China University of Mining & Technology, Xuzhou 221116, China
    School of Geology and Mining Engineering, Xinjiang University, Urumqi 830046, China
    Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention, China University of Mining & Technology, Xuzhou 221116, China)

  • Anye Cao

    (School of Mines, China University of Mining & Technology, Xuzhou 221116, China
    Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention, China University of Mining & Technology, Xuzhou 221116, China)

  • Wenhao Guo

    (School of Mines, China University of Mining & Technology, Xuzhou 221116, China
    Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention, China University of Mining & Technology, Xuzhou 221116, China)

  • Chengchun Xue

    (School of Mines, China University of Mining & Technology, Xuzhou 221116, China
    Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention, China University of Mining & Technology, Xuzhou 221116, China)

  • Guowei Lv

    (School of Mines, China University of Mining & Technology, Xuzhou 221116, China
    Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention, China University of Mining & Technology, Xuzhou 221116, China)

  • Xianlei Yan

    (Xinglongzhuang Coal Mine, Yanzhou Coal Industry Co., Ltd., Jining 272102, China)

Abstract

Solutions for the maintenance of safety in an isolated working face has not been well achieved; this is attributed to its unique overburden structure and the strong mining-induced stress during the advancement. This paper is devoted to filling this research gap and is based on the case study of LW 10304 in the Xinglongzhuang Coal Mine, in China. The overburden structure and stress distribution characteristics of this isolated working face were theoretically investigated, followed by the development of a comprehensive identification method. The research results showed the following: (1) The overburden strata of LW 10304 is in the form of a short “T” shape and the stress increment is featured with the overall “saddle” shape before the extraction of the isolated working face. During this period, the lower key strata and main key strata affect the stress level at the two ends and the central part of the working face, respectively; (2) Both the frequency and energy of micro-earthquakes in the working face account for more than 95%, which is positively correlated with roof damage and rib spalling, associated with some overlaps between the damaged zones; (3) The fracture movement of inferior key strata near the coal seam plays a dominant role in affecting microseism activity and mining-induced stress. The microseism energy attributed to roof breakage accounts for 43.34% of the overall energy; (4) A comprehensive indexing system, covering microseism frequency, microseism energy, and support resistance, was established to identify the mining-induced stress intensity of the isolated working face. The early warning efficiency of the “strong” degree of mining-induced stress is 0.94, which is believed to provide an option for other isolated working faces with similar geological and mining conditions.

Suggested Citation

  • Yingyuan Wen & Anye Cao & Wenhao Guo & Chengchun Xue & Guowei Lv & Xianlei Yan, 2023. "Strata Movement and Mining-Induced Stress Identification for an Isolated Working Face Surrounded by Two Goafs," Energies, MDPI, vol. 16(6), pages 1-18, March.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:6:p:2839-:d:1101058
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    References listed on IDEAS

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    1. Yiqi Chen & Changyou Liu & Jinrong Liu & Peiju Yang & Shuo Lu, 2022. "Case Study on Dynamic Identification of Overburden Fracture and Strong Mine Pressure Mechanism of Isolated Working Face Based on Microseismic Clustering," Sustainability, MDPI, vol. 15(1), pages 1-19, December.
    2. Jingxuan Yang & Changyou Liu & Bin Yu, 2017. "Application of Confined Blasting in Water-Filled Deep Holes to Control Strong Rock Pressure in Hard Rock Mines," Energies, MDPI, vol. 10(11), pages 1-16, November.
    3. Bo Sun & Sitao Zhu & Fuxing Jiang & Gao’ang Wang & Fuqiang Ren, 2022. "Mechanism and Safety Mining Technology of Overall Instability-Induced Rockbursts of Multi-Coal Seam Spatially Isolated Working Face," Mathematical Problems in Engineering, Hindawi, vol. 2022, pages 1-14, September.
    4. Jun Guo & Guorui Feng & Pengfei Wang & Tingye Qi & Xiaorong Zhang & Yonggan Yan, 2018. "Roof Strata Behavior and Support Resistance Determination for Ultra-Thick Longwall Top Coal Caving Panel: A Case Study of the Tashan Coal Mine," Energies, MDPI, vol. 11(5), pages 1-19, April.
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