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

Ma Zhanyuan; Liu Chuang; Li Huamin

doi:doi:10.11648/j.ogce.20210902.11

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

Ma Zhanyuan, Liu Chuang, Li Huamin

Published in International Journal of Oil, Gas and Coal Engineering (Volume 9, Issue 2)

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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[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.
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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

Ma Zhanyuan

Jinneng Holding Group, Datong, China
Liu Chuang

Jinneng Holding Group, Datong, China
Li Huamin

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

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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

Copy | Download

@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}
}

Copy | Download

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  -

Copy | Download