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Study on Characteristics of Overburden Strata Structure above Abandoned Gob of Shallow Seams—A Case Study

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  • Ning Jiang

    (State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
    General Institute of Exploration and Research of China National Administration of Coal Geology, Beijing 100039, China)

  • Ke Lv

    (State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China)

  • Zhiyou Gao

    (State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
    Shandong Geology and Mineral Resources Engineering Group Co., Ltd., Jinan 250013, China)

  • Huixin Di

    (Shandong Procincial Bureau of Geology & Mineral Resources, Jinan 250013, China)

  • Junbiao Ma

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Tianyi Pan

    (College of Foreign Languages, Shandong University of Science and Technology, Qingdao 266590, China)

Abstract

To understand the change in overburden structure after coal seam group mining, we investigated the overburden characteristics and bearing capacity of abandoned coal mines in a coal seam group. We provide a theoretical basis for the construction and utilization of a coal mining subsidence area under a complex geological environment. This paper takes the construction project of Zhongtie Huizhi Square in Zhangqiu District, Jinan City, Shandong Province as the engineering background. According to the occurrence conditions of the study area, theoretical analysis, similar simulation, numerical simulation, and engineering practice verification are used. The overburden structure characteristics of abandoned mines in a shallow-buried coal seam group were studied. The results show that the development height of the water-carrying fractured zone after the mining of the 3#, 4#, and 9# coal seams is 17 m, 19.5 m, and 27.1 m, respectively, which shows that the height of water flow in the fractured zone is proportional to the buried depth of the coal seam after coal seam mining. After the model is set aside for three months, the degree of development of the residual fracture in the goaf is analyzed, and the distribution law of residual porosity in the longwall old goaf of a shallow-buried multiple coal seam is obtained. The development rate of residual fissures on both sides of the goaf is between 20.31% and 42.31%. The residual fracture development rate in the middle is relatively small, being between 8.21% and 18.53%. We comprehensively analyzed the characteristics of overlying strata in the abandoned mine under actual stratum conditions, and compared the empirical calculation results, theoretical research, similar simulation, and numerical simulation results in the specification with the engineering practice to prove the reliability of the research.

Suggested Citation

  • Ning Jiang & Ke Lv & Zhiyou Gao & Huixin Di & Junbiao Ma & Tianyi Pan, 2022. "Study on Characteristics of Overburden Strata Structure above Abandoned Gob of Shallow Seams—A Case Study," Energies, MDPI, vol. 15(24), pages 1-22, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:24:p:9359-:d:999587
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    References listed on IDEAS

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    1. Ximin Cui & Yuling Zhao & Guorui Wang & Bing Zhang & Chunyi Li, 2020. "Calculation of Residual Surface Subsidence Above Abandoned Longwall Coal Mining," Sustainability, MDPI, vol. 12(4), pages 1-12, February.
    2. Junbiao Ma & Ning Jiang & Xujun Wang & Xiaodong Jia & Dehao Yao, 2021. "Numerical Study of the Strength and Characteristics of Sandstone Samples with Combined Double Hole and Double Fissure Defects," Sustainability, MDPI, vol. 13(13), pages 1-16, June.
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