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Inorganic Cement Grouting for Reinforcing Triangular Zone of Highly Gassy Coal Face with Large Mining Height

Author

Listed:
  • Bin Song

    (State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, China
    Sihe Coal Mine, Jincheng Coal Mining Group, Jincheng 048205, China)

  • Shuai Zhang

    (State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Dongsheng Zhang

    (State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Gangwei Fan

    (State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Wei Yu

    (State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Qiang Zhao

    (State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Shuaishuai Liang

    (State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

Aiming to address the serious problem of coal wall spalling in the triangular zone of the coal face end under high-intensity mining, this paper introduces inorganic cement grouting reinforcement technology for medium-depth holes based on the specific geological conditions of the Sihe coal mine in China. Firstly, the effects of different water-to-material ratios and various accelerators on setting time and uniaxial compressive strength (UCS) of grouting materials and consolidation coal are studied. The results show that the combination of 2% accelerator I, 0.3% accelerator II, and 3.0% accelerator III was the most effective. Then, FLAC3D numerical simulation software was used to analyze the distribution laws of the plastic zone, the lateral abutment pressure, and abutment stresses in the face ends during repeated mining. The results indicate that the zone within 25–65 m of the front of the coal face was initially affected by the front abutment pressure. In this area, the stress value decreased slowly and fracture development was relatively intense. Grouting with high pressure and a large flow rate should be used in this scenario as the industrial experiment results indicated that the proposed inorganic cement grouting reinforcement technology could effectively control coal wall spalling and provide technical support for safe and efficient mining.

Suggested Citation

  • Bin Song & Shuai Zhang & Dongsheng Zhang & Gangwei Fan & Wei Yu & Qiang Zhao & Shuaishuai Liang, 2018. "Inorganic Cement Grouting for Reinforcing Triangular Zone of Highly Gassy Coal Face with Large Mining Height," Energies, MDPI, vol. 11(10), pages 1-23, September.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:10:p:2549-:d:171767
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    References listed on IDEAS

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    1. Zhu Li & Jialin Xu & Shengchao Yu & Jinfeng Ju & Jingmin Xu, 2018. "Mechanism and Prevention of a Chock Support Failure in the Longwall Top-Coal Caving Faces: A Case Study in Datong Coalfield, China," Energies, MDPI, vol. 11(2), pages 1-17, January.
    2. Shuai Zhang & Shijie Tang & Dongsheng Zhang & Gangwei Fan & Zhen Wang, 2017. "Determination of the Height of the Water-Conducting Fractured Zone in Difficult Geological Structures: A Case Study in Zhao Gu No. 1 Coal Seam," Sustainability, MDPI, vol. 9(7), pages 1-19, June.
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    Cited by:

    1. Erhu Bai & Wenbing Guo & Dongsheng Zhang & Yi Tan & Mingjie Guo & Gaobo Zhao, 2019. "Using the Magnetotelluric Method for Detecting Aquifer Failure Characteristics under High-Intensity Mining of Thick Coal Seams," Energies, MDPI, vol. 12(22), pages 1-14, November.

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