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Study on Mine Earthquakes Mechanism and Ground Vertical Well Hydraulic Fracturing Shock Absorption in Thick Hard Rock Mine

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  • Xiaoguang Shang

    (Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines, School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China)

  • Sitao Zhu

    (Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines, School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
    Shandong Energy Group Company Limited, Jinan 250014, China)

  • Fuxing Jiang

    (Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines, School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China)

  • Jinhai Liu

    (Hebei State Key Laboratory of Mine Disaster Prevention, North China Institute of Science and Technology, Langfang 065201, China)

  • Xiufeng Zhang

    (Shandong Energy Group Company Limited, Jinan 250014, China)

  • Xiang Sun

    (Shandong Energy Group Company Limited, Jinan 250014, China)

  • Chao Wang

    (Shandong Energy Group Company Limited, Jinan 250014, China)

  • Yang Chen

    (Shandong Energy Group Company Limited, Jinan 250014, China)

  • Bo Xu

    (Shandong Energy Group Company Limited, Jinan 250014, China)

  • Jiajie Li

    (Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines, School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China)

  • Xiaocheng Qu

    (Beijing Anke Xingye Science and Technology Co., Ltd., Beijing 102299, China)

Abstract

Mine earthquakes are serious disasters in coal mines, especially in extremely thick hard strata. This study investigates the occurrence mechanism of fracture-type mine earthquakes in thick hard strata. Hydraulic fracturing by ground vertical well was used for shock absorption. Dongtan coal mine was taken as a case study. Field investigation, theoretical analysis, industrial tests, and field monitoring were used for revealing the mechanism. First, the mechanical model of extremely thick, hard strata under horizontal concentrated stress was established. The fracture step equation and energy release equation of extremely thick hard rock were derived by semi-inverse solution and variational method. Then, the mechanical model of extremely thick hard rock after hydraulic fracturing by ground vertical well was established. The relationship between the spacing of the ground vertical well and the maximum magnitude of mine earthquakes was deduced. The fracturing well in the 6306 working face was designed for controlling the maximum mine earthquake magnitude. Results show that the increases in the breaking distance of the thick hard rock layer led to an increase in the released energy during the fracture, and an enhancement of the magnitude of the mine earthquake. By applying hydraulic fracturing technology using the ground vertical shaft, the occurrence frequency and total energy of mine earthquakes above 1.5 ML in the 6306 working face decreased by 54.55% and 81.22% than that in 6304 working face, and reduced by 70% and 84.98% than that in 6305 working face. Hydraulic fracturing technology by ground vertical well can significantly reduce the frequency of fracture-type and the total energy of mine earthquakes in extremely thick and hard strata. However, it can not prevent and control the occurrence of back-transition mine earthquakes and slip-type mine earthquakes. The obtained results can provide a basis for the fracture-type mine earthquake mechanism and fracturing shock absorption technology in coal mines with super-thick hard strata.

Suggested Citation

  • Xiaoguang Shang & Sitao Zhu & Fuxing Jiang & Jinhai Liu & Xiufeng Zhang & Xiang Sun & Chao Wang & Yang Chen & Bo Xu & Jiajie Li & Xiaocheng Qu, 2023. "Study on Mine Earthquakes Mechanism and Ground Vertical Well Hydraulic Fracturing Shock Absorption in Thick Hard Rock Mine," Sustainability, MDPI, vol. 15(6), pages 1-23, March.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:6:p:5122-:d:1096694
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    References listed on IDEAS

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    1. Shengquan He & Dazhao Song & Zhenlei Li & Xueqiu He & Jianqiang Chen & Taoping Zhong & Quan Lou, 2020. "Mechanism and Prevention of Rockburst in Steeply Inclined and Extremely Thick Coal Seams for Fully Mechanized Top-Coal Caving Mining and Under Gob Filling Conditions," Energies, MDPI, vol. 13(6), pages 1-26, March.
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