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Study on the Law of Fracture Evolution under Repeated Mining of Close-Distance Coal Seams

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  • Feng Cui

    (Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education, Xi’an 710054, China
    Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources, Shaanxi Coal Geology Group Co., Ltd., Xi’an 710021, China)

  • Chong Jia

    (Energy School, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Xingping Lai

    (Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education, Xi’an 710054, China
    Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources, Shaanxi Coal Geology Group Co., Ltd., Xi’an 710021, China)

  • Yanbing Yang

    (Energy School, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Shuai Dong

    (Energy School, Xi’an University of Science and Technology, Xi’an 710054, China)

Abstract

The western region of China is rich in mineral resources. The vigorous development of mineral resources has exacerbated the environmental and safety problems in the region. One of the important links to solve this problem is to control the development laws and distribution characteristics of the overburdened cracks in the mining of this area. In this paper, the Xiashijie coal mine 3-2 coal seam and 4-2 coal seam are examples of repeated mining, and are examined as the background, through theoretical analysis to optimize the size of the coal pillars in the lower section, using the 3DEC numerical simulation experiment method and the rise of the cracks in the short-distance coal seam. Repeated mining monitoring and analysis of the development law are used to ascertain distribution characteristics of overburdened cracks caused by the repeated mining process of the working face. The results show that: (1) By establishing a mechanical model of the overlying strata structure under short-distance coal seam group mining, and carrying out the force analysis of the double section coal pillar under repeated mining, the reasonable size of a lower section coal pillar was determined to be 70 m. (2) As the development height of a fracture progresses with the working face, its expansion rate undergoes four obvious changes: fluctuations within a certain range, the expansion rate reaches the peak after the rock formation is concentrated and broken, the cyclical change gradually decreases, and the expansion rate is zero after complete mining. (3) The fracture zone height of 222 and 224 face under repeated mining in the 4-2 coal seam was 19.56–22.31 times and 22.38–24.54 times larger, respectively, and the post-mining fracture extension of the face with larger width and deeper burial under repeated mining was higher than that of the adjacent face. This study provides scientific guidance for the rational division of coal pillars and the solution of the problem of water conservation mining under repeated mining in the adjacent face of a short-distance coal seam.

Suggested Citation

  • Feng Cui & Chong Jia & Xingping Lai & Yanbing Yang & Shuai Dong, 2020. "Study on the Law of Fracture Evolution under Repeated Mining of Close-Distance Coal Seams," Energies, MDPI, vol. 13(22), pages 1-20, November.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:22:p:6064-:d:447889
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    References listed on IDEAS

    as
    1. Feng Cui & Tinghui Zhang & Xingping Lai & Jiantao Cao & Pengfei Shan, 2019. "Study on the Evolution Law of Overburden Breaking Angle under Repeated Mining and the Application of Roof Pressure Relief," Energies, MDPI, vol. 12(23), pages 1-20, November.
    2. Feng Cui & Shuai Dong & Xingping Lai & Jianqiang Chen & Jiantao Cao & Pengfei Shan, 2019. "Study on Rule of Overburden Failure and Rock Burst Hazard under Repeated Mining in Fully Mechanized Top-Coal Caving Face with Hard Roof," Energies, MDPI, vol. 12(24), pages 1-16, December.
    3. Feng Cui & Chong Jia & Xingping Lai, 2019. "Study on Deformation and Energy Release Characteristics of Overlying Strata under Different Mining Sequence in Close Coal Seam Group Based on Similar Material Simulation," Energies, MDPI, vol. 12(23), pages 1-30, November.
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    Cited by:

    1. Shengrong Xie & Yiyi Wu & Fangfang Guo & Dongdong Chen & En Wang & Xiao Zhang & Hang Zou & Ruipeng Liu & Xiang Ma & Shijun Li, 2022. "Interaction Mechanism of the Upper and Lower Main Roofs with Different Properties in Close Coal Seams: A Case Study," Energies, MDPI, vol. 15(15), pages 1-21, July.
    2. Feng Zhang & Jinshan Zhang, 2022. "Research on Joint Protection Layers and Gas Prevention Technology in Outburst Coal Seams," Sustainability, MDPI, vol. 14(14), pages 1-15, July.
    3. Zhao, Pengxiang & Zhuo, Risheng & Li, Shugang & Lin, Haifei & Shu, Chi-Min & Shuang, Haiqing & Wei, Zongyong, 2023. "Greenhouse gas protection and control based upon the evolution of overburden fractures under coal mining: A review of methods, influencing factors, and techniques," Energy, Elsevier, vol. 284(C).

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