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Investigation into Pressure Appearances and Hydraulic Fracturing Roof-Cutting Technology in Mining Working Face under Residual Pillars: A Case Study

Author

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  • Wenda Wu

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Xuzhou Coal Mining Group Co., Ltd., Xuzhou 221116, China
    Key Laboratory of Shanxi Province for Mine Rock Strata Control and Disaster Prevention, Taiyuan 030024, China)

  • Guorui Feng

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Key Laboratory of Shanxi Province for Mine Rock Strata Control and Disaster Prevention, Taiyuan 030024, China)

  • Xiuxiu Yu

    (School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China)

  • Jianbiao Bai

    (State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221116, China)

  • Xiangyu Wang

    (State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221116, China)

  • Xiangzhuo Zhao

    (Shaanxi Yanchang Petroleum Balasu Coal Industry Co., Ltd., Yulin 719000, China)

Abstract

Strong mining pressure disasters are prone to happen when the mining working face is under residual pillars (MWFRPs). The purpose of this study was to experimentally investigate and evaluate pressure manifestations and hydraulic fracture roof-cutting technology in the development of a working face under residual pillars using a physical model and numerical modelling tools. A scheme for hydraulic fracturing cutting technology was proposed and carried out on-site at the 31106 working face. The results show that the instability of the overlying residual pillar causes the upper thick, hard strata (THS II) to rupture and form a “T-shaped structure”. The rotation and sinking movement of the structure leads to the transmission of the dynamic load downwards, causing shear failure in the lower thick, hard strata (THS I) along the boundary of the residual pillar. The smaller the length of the THS II fracture block, the smaller the shear damage of THS I, and the lesser the mining pressure in the working face. Field trials proved that hydraulic fracture roof cutting can effectively destroy the integrity of the thick hard strata and promote their collapse, which reduces the strong dynamic load borne by the hydraulic support. This research provides a reference for safe mining at a working face under similar conditions.

Suggested Citation

  • Wenda Wu & Guorui Feng & Xiuxiu Yu & Jianbiao Bai & Xiangyu Wang & Xiangzhuo Zhao, 2023. "Investigation into Pressure Appearances and Hydraulic Fracturing Roof-Cutting Technology in Mining Working Face under Residual Pillars: A Case Study," Energies, MDPI, vol. 16(9), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:9:p:3914-:d:1140165
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    References listed on IDEAS

    as
    1. Qingying Cheng & Bingxiang Huang & Luying Shao & Xinglong Zhao & Shuliang Chen & Haoze Li & Changwei Wang, 2020. "Combination of Pre-Pulse and Constant Pumping Rate Hydraulic Fracturing for Weakening Hard Coal and Rock Mass," Energies, MDPI, vol. 13(21), pages 1-22, October.
    2. Hengfeng Liu & Qiang Sun & Nan Zhou & Zhongya Wu, 2021. "Risk Assessment and Control Strategy of Residual Coal Pillar in Room Mining: Case Study in Ecologically Fragile Mining Areas, China," Sustainability, MDPI, vol. 13(5), pages 1-13, March.
    3. Marek Jendryś & Andrzej Hadam & Mateusz Ćwiękała, 2021. "Directional Hydraulic Fracturing (DHF) of the Roof, as an Element of Rock Burst Prevention in the Light of Underground Observations and Numerical Modelling," Energies, MDPI, vol. 14(3), pages 1-18, January.
    4. Nan Zhou & Hao Yan & Shuyin Jiang & Qiang Sun & Shenyang Ouyang, 2019. "Stability Analysis of Surrounding Rock in Paste Backfill Recovery of Residual Room Pillars," Sustainability, MDPI, vol. 11(2), pages 1-13, January.
    5. Yongqiang Zhang & Xiangyu Wang & Feiteng Zhang & Menglong Li & Guanghui Wang & Dingchao Chen & Guanjun Li & Xiangqian Zhao, 2023. "Retracement Ground Pressure Appearance and Control of the Working Face under the Overlying Residual Pillar: A Case Study," Energies, MDPI, vol. 16(4), pages 1-21, February.
    6. 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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