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Research on the Ground Pressure Features of Long Wall Top Coal Caving Working Face in Extra-Thick Coal Seam

Received: 24 March 2021     Accepted: 6 April 2021     Published: 21 May 2021
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Abstract

Based on the raw data of shield pressure and overlying strata movement measured in the field, the ground pressure features and overlying strata movement were analyzed in 8202 extra-thick coal seam longwall top coal caving working face of Tongxin coal mine after its extraction. The research results show that: during the process of mining, the interval of the lower sub key strata caved for the first time is 120 m, the periodic weighting interval ranges from 15 m to 30 m, with an average of 25 m. When the immediate roof is relatively thick, the fractured lower sub key strata can be hinged to form a stable “Voussoir Beam” structure, which makes the ground pressure not severe and the shield pressure small in the ends of the panel. When the immediate roof is thin, the arc triangular of the lower sub key strata in the ends of the panel loses mechanical contact to the caved immediate roof and assumes a “Cantilever Beam” structure, which makes the ground pressure severe and shield pressure large in the ends of the panel. Due to the large mining space of longwall top coal caving working face in extra-thick coal seam and big rotary angle of the overlying strata, the lower sub key strata can’t connect with each other to form a stable bearing structure, therefore, the shield pressure is a given load of roof rock, which results in a constant pressure of the shield.

Published in International Journal of Oil, Gas and Coal Engineering (Volume 9, Issue 2)
DOI 10.11648/j.ogce.20210902.11
Page(s) 12-16
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2021. Published by Science Publishing Group

Keywords

Extra-thick Coal Seam, Top Coal Caving Face, Strata Movement, Ground Pressure Features, Shield Pressure

References
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[2] REN Q. H., XU Z. Y., CHEN C. (2021). Overburden structure and rock pressure law of fully-mechanized top coal caving stope in extra-thick coal seam. Coal Engineering. 53 (01): 79-83.
[3] Li H. M., JIANG D. J., Syd S. P. (2015). Analysis on loading features and suitability of hydraulic powered caving supports. Coal Science and Technology. 43 (6): 22-28, 70.
[4] Yu B., ZHU W. B., GAO R. (2016). Strata structure and its effect mechanism of large space stope for fully-mechanized sublevel caving mining of extremely thick coal seam. Journal of China Coal Society. 41 (3): 571-580.
[5] KONG L. H. (2020). Overlying strata movement law and its strata pressure mechanism in fully mechanized top-coal caving workface with large space. Journal of Mining & Safety Engineering. 37 (05): 943-950. doi 10.13545/j.cnki.jmse. 2020.05.010.
[6] WANG H. J., LIU Y. J. (2020). Study on overlying strata movement and stress dynamic evolution above working face in 8.8 m extra-thick coal seam. Coal Science and Technology, 48 (11): 68-76. doi: 10. 13199 /j. cnki.cst.2020.11.009.
[7] Huang Z. Z. (2013). Study on laws of roof strata fracture of fully mechanized caving mining under goaf in ultra-thick seam. Coal Science and Technology. 41 (7): 60-62, 66.
[8] Yan S. H. (2009) Theory study on the load on support of longwall with top coal caving with great mining height in extra thick coal seam. Journal of China Coal Society. 34 (5): 590-693.
[9] Jia X. R., ZHAI Y. D., YANG S. S. (1998). Structure of roof rocks in sub-level caving face and calculation of rock weighting. Journal of China Coal Society. 23 (4): 366-370.
[10] LIU C., LI H. M., Mitri Hani, JIANG D. J., CHEN W. X. (2020). Strata movement analysis at Tongxin longwall top coal caving working face with extra-thick coal seam. Arabian Journal of Geosciences, doi: 10.1007/s12517-019-4787-0.
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[12] LIU C., LI H. M., Mitri Hani (2017). Voussoir beam model for lower strong roof strata movement in longwall mining-Case study. Journal of Rock Mechanics and Geological Engineering, 9 (6): 1171-1176.
[13] Zhu S. S., LI H. C., YANG Z. F. (1996). The structure of overlying coal and rocks in sublevel caving faces. Chinese Journal of Mechanics and Engineering. 15 (2): 150-154.
[14] Gu Q. Z., SHI Y. W., QI Q. X. (1996). Rules of roof movement in sub-level caving workings. Journal of China Coal Society. 21 (1): 45-50.
[15] Kang T. H., CHAI Z. Y., LI Y. B. (2007). Study on physical simulation of full-seam mining for a 20m very thick and medium hard seam by sub-level caving mining with high bottom cutting height. Chinese Journal of Rock Mechanics and Engineering. 26 (5): 1065-1072.
[16] LIU C., LI H. M. & Mitri Hani (2019). Effect of Strata Conditions on Shield Pressure and Surface Subsidence at a Longwall Top Coal Caving Working Face. Rock Mechanics and Rock Engineering, 52: 1523-1537.
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  • APA Style

    Ma Zhanyuan, Liu Chuang, Li Huamin. (2021). Research on the Ground Pressure Features of Long Wall Top Coal Caving Working Face in Extra-Thick Coal Seam. International Journal of Oil, Gas and Coal Engineering, 9(2), 12-16. https://doi.org/10.11648/j.ogce.20210902.11

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    ACS Style

    Ma Zhanyuan; Liu Chuang; Li Huamin. Research on the Ground Pressure Features of Long Wall Top Coal Caving Working Face in Extra-Thick Coal Seam. Int. J. Oil Gas Coal Eng. 2021, 9(2), 12-16. doi: 10.11648/j.ogce.20210902.11

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    AMA Style

    Ma Zhanyuan, Liu Chuang, Li Huamin. Research on the Ground Pressure Features of Long Wall Top Coal Caving Working Face in Extra-Thick Coal Seam. Int J Oil Gas Coal Eng. 2021;9(2):12-16. doi: 10.11648/j.ogce.20210902.11

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  • @article{10.11648/j.ogce.20210902.11,
      author = {Ma Zhanyuan and Liu Chuang and Li Huamin},
      title = {Research on the Ground Pressure Features of Long Wall Top Coal Caving Working Face in Extra-Thick Coal Seam},
      journal = {International Journal of Oil, Gas and Coal Engineering},
      volume = {9},
      number = {2},
      pages = {12-16},
      doi = {10.11648/j.ogce.20210902.11},
      url = {https://doi.org/10.11648/j.ogce.20210902.11},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ogce.20210902.11},
      abstract = {Based on the raw data of shield pressure and overlying strata movement measured in the field, the ground pressure features and overlying strata movement were analyzed in 8202 extra-thick coal seam longwall top coal caving working face of Tongxin coal mine after its extraction. The research results show that: during the process of mining, the interval of the lower sub key strata caved for the first time is 120 m, the periodic weighting interval ranges from 15 m to 30 m, with an average of 25 m. When the immediate roof is relatively thick, the fractured lower sub key strata can be hinged to form a stable “Voussoir Beam” structure, which makes the ground pressure not severe and the shield pressure small in the ends of the panel. When the immediate roof is thin, the arc triangular of the lower sub key strata in the ends of the panel loses mechanical contact to the caved immediate roof and assumes a “Cantilever Beam” structure, which makes the ground pressure severe and shield pressure large in the ends of the panel. Due to the large mining space of longwall top coal caving working face in extra-thick coal seam and big rotary angle of the overlying strata, the lower sub key strata can’t connect with each other to form a stable bearing structure, therefore, the shield pressure is a given load of roof rock, which results in a constant pressure of the shield.},
     year = {2021}
    }
    

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  • TY  - JOUR
    T1  - Research on the Ground Pressure Features of Long Wall Top Coal Caving Working Face in Extra-Thick Coal Seam
    AU  - Ma Zhanyuan
    AU  - Liu Chuang
    AU  - Li Huamin
    Y1  - 2021/05/21
    PY  - 2021
    N1  - https://doi.org/10.11648/j.ogce.20210902.11
    DO  - 10.11648/j.ogce.20210902.11
    T2  - International Journal of Oil, Gas and Coal Engineering
    JF  - International Journal of Oil, Gas and Coal Engineering
    JO  - International Journal of Oil, Gas and Coal Engineering
    SP  - 12
    EP  - 16
    PB  - Science Publishing Group
    SN  - 2376-7677
    UR  - https://doi.org/10.11648/j.ogce.20210902.11
    AB  - Based on the raw data of shield pressure and overlying strata movement measured in the field, the ground pressure features and overlying strata movement were analyzed in 8202 extra-thick coal seam longwall top coal caving working face of Tongxin coal mine after its extraction. The research results show that: during the process of mining, the interval of the lower sub key strata caved for the first time is 120 m, the periodic weighting interval ranges from 15 m to 30 m, with an average of 25 m. When the immediate roof is relatively thick, the fractured lower sub key strata can be hinged to form a stable “Voussoir Beam” structure, which makes the ground pressure not severe and the shield pressure small in the ends of the panel. When the immediate roof is thin, the arc triangular of the lower sub key strata in the ends of the panel loses mechanical contact to the caved immediate roof and assumes a “Cantilever Beam” structure, which makes the ground pressure severe and shield pressure large in the ends of the panel. Due to the large mining space of longwall top coal caving working face in extra-thick coal seam and big rotary angle of the overlying strata, the lower sub key strata can’t connect with each other to form a stable bearing structure, therefore, the shield pressure is a given load of roof rock, which results in a constant pressure of the shield.
    VL  - 9
    IS  - 2
    ER  - 

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Author Information
  • Jinneng Holding Group, Datong, China

  • Jinneng Holding Group, Datong, China

  • School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, China

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