Critical Break Length of Floor Aquiclude During Longwall Mining Above Confined Aquifer

Baohua Guo; Feng Jiao; Xiaoyu Yang

doi:doi:10.11648/j.earth.20170606.17

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Critical Break Length of Floor Aquiclude During Longwall Mining Above Confined Aquifer

Baohua Guo, Feng Jiao, Xiaoyu Yang

Published in Earth Sciences (Volume 6, Issue 6)

Received: 5 September 2017 Accepted: 21 September 2017 Published: 2 November 2017

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Abstract

Floor water inrushes not only cause heavy casualties and property losses, but seriously restrict the production of coal mines. The aquiclude was simplified as the fixed - fixed beam under the uniform load, and critical break length formula of floor aquiclude in three failure modes including bending failure, shear failure and buckling of pressure bar were established. Then the critical lengths of aquiclude in three failure modes were calculated according to the geological and mining conditions of 15031 panel in Jiulishan coalmine. The results show that the critical break length in bending failure is the smallest, while the critical length in shear failure mode is the biggest. And failures of fixed – fixed beam in three failure modes all occur at two ends so that water inrush from floor may occur at open-off cut or working face. Additionally, three critical break lengths increase with aquiclude thickness but decrease with confined aquifer pressure. According to the calculated results, water inrush may occur at the working face or open-off cut when mining advance reaches 12.47 m, and thus three control measures of lowering aquifer pressure, increasing aquiclude thickness and shortening the distances of first and interval weighting of main roof were discussed. The conclusions can provide references to control water inrush from floor aquifer in coal mines.

Published in	Earth Sciences (Volume 6, Issue 6)
DOI	10.11648/j.earth.20170606.17
Page(s)	149-156
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), 2017. Published by Science Publishing Group

Keywords

Coal Mine, Water Inrush, Floor Aquiclude, Fixed - fixed Beam, Critical Break Length

References

[1]	HAN, J., et al., Mechanism of mine water-inrush through a fault from the floor. Mining Science and Technology (China), 2009. 19(3): p. 276-281.
[2]	Li, H. M. and Fu, K., Some major technical problems and countermeasures for deep mining. Journal of Mining & Safety Engineering, 2006(04): p.468-471. (in chinese).
[3]	Wang, J. A. and Park, H. D. Coal mining above a confined aquifer. International Journal of Rock Mechanics and Mining Sciences, 2003. 40(4): p. 537-551.
[4]	Zhang, J., Investigations of water inrushes from aquifers under coal seams. International Journal of Rock Mechanics and Mining Sciences, 2005. 42(3): p. 350-360.
[5]	Yang, T. H., et al., A coupled flow-stress-damage model for groundwater outbursts from an underlying aquifer into mining excavations. International Journal of Rock Mechanics and Mining Sciences, 2007. 44(1): p. 87-97.
[6]	KONG, H., et al., Analysis of the Harmfulness of Water-Inrush from Coal Seam Floor Based on Seepage Instability Theory. Journal of China University of Mining and Technology, 2007. 17(4): p. 453-458.
[7]	Zhu, Q., et al., Numerical analysis of water inrush from working-face floor during mining. Journal of China University of Mining and Technology, 2008. 18(2): p. 159-163.
[8]	Jiang, Z. H., Numerical analysis of the destruction of water-resisting strata in a coal seam floor in mining above aquifers. Mining Science and Technology (China), 2011. 21(4): p. 537-541.
[9]	Jian, S., et al., Determining areas in an inclined coal seam floor prone to water-inrush by micro-seismic monitoring. Mining Science and Technology (China), 2011. 21(2): p. 165-168.
[10]	Huang, Z., et al., Characterizing the hydraulic conductivity of rock formations between deep coal and aquifers using injection tests. International Journal of Rock Mechanics and Mining Sciences, 2014. 71: p. 12-18.
[11]	Li, S., et al., Detecting and monitoring of water inrush in tunnels and coal mines using direct current resistivity method: A review. Journal of Rock Mechanics and Geotechnical Engineering, 2015. 7(4): p. 469-478.

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APA Style

Baohua Guo, Feng Jiao, Xiaoyu Yang. (2017). Critical Break Length of Floor Aquiclude During Longwall Mining Above Confined Aquifer. Earth Sciences, 6(6), 149-156. https://doi.org/10.11648/j.earth.20170606.17

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ACS Style

Baohua Guo; Feng Jiao; Xiaoyu Yang. Critical Break Length of Floor Aquiclude During Longwall Mining Above Confined Aquifer. Earth Sci. 2017, 6(6), 149-156. doi: 10.11648/j.earth.20170606.17

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AMA Style

Baohua Guo, Feng Jiao, Xiaoyu Yang. Critical Break Length of Floor Aquiclude During Longwall Mining Above Confined Aquifer. Earth Sci. 2017;6(6):149-156. doi: 10.11648/j.earth.20170606.17

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@article{10.11648/j.earth.20170606.17,
  author = {Baohua Guo and Feng Jiao and Xiaoyu Yang},
  title = {Critical Break Length of Floor Aquiclude During Longwall Mining Above Confined Aquifer},
  journal = {Earth Sciences},
  volume = {6},
  number = {6},
  pages = {149-156},
  doi = {10.11648/j.earth.20170606.17},
  url = {https://doi.org/10.11648/j.earth.20170606.17},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.earth.20170606.17},
  abstract = {Floor water inrushes not only cause heavy casualties and property losses, but seriously restrict the production of coal mines. The aquiclude was simplified as the fixed - fixed beam under the uniform load, and critical break length formula of floor aquiclude in three failure modes including bending failure, shear failure and buckling of pressure bar were established. Then the critical lengths of aquiclude in three failure modes were calculated according to the geological and mining conditions of 15031 panel in Jiulishan coalmine. The results show that the critical break length in bending failure is the smallest, while the critical length in shear failure mode is the biggest. And failures of fixed – fixed beam in three failure modes all occur at two ends so that water inrush from floor may occur at open-off cut or working face. Additionally, three critical break lengths increase with aquiclude thickness but decrease with confined aquifer pressure. According to the calculated results, water inrush may occur at the working face or open-off cut when mining advance reaches 12.47 m, and thus three control measures of lowering aquifer pressure, increasing aquiclude thickness and shortening the distances of first and interval weighting of main roof were discussed. The conclusions can provide references to control water inrush from floor aquifer in coal mines.},
 year = {2017}
}

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TY  - JOUR
T1  - Critical Break Length of Floor Aquiclude During Longwall Mining Above Confined Aquifer
AU  - Baohua Guo
AU  - Feng Jiao
AU  - Xiaoyu Yang
Y1  - 2017/11/02
PY  - 2017
N1  - https://doi.org/10.11648/j.earth.20170606.17
DO  - 10.11648/j.earth.20170606.17
T2  - Earth Sciences
JF  - Earth Sciences
JO  - Earth Sciences
SP  - 149
EP  - 156
PB  - Science Publishing Group
SN  - 2328-5982
UR  - https://doi.org/10.11648/j.earth.20170606.17
AB  - Floor water inrushes not only cause heavy casualties and property losses, but seriously restrict the production of coal mines. The aquiclude was simplified as the fixed - fixed beam under the uniform load, and critical break length formula of floor aquiclude in three failure modes including bending failure, shear failure and buckling of pressure bar were established. Then the critical lengths of aquiclude in three failure modes were calculated according to the geological and mining conditions of 15031 panel in Jiulishan coalmine. The results show that the critical break length in bending failure is the smallest, while the critical length in shear failure mode is the biggest. And failures of fixed – fixed beam in three failure modes all occur at two ends so that water inrush from floor may occur at open-off cut or working face. Additionally, three critical break lengths increase with aquiclude thickness but decrease with confined aquifer pressure. According to the calculated results, water inrush may occur at the working face or open-off cut when mining advance reaches 12.47 m, and thus three control measures of lowering aquifer pressure, increasing aquiclude thickness and shortening the distances of first and interval weighting of main roof were discussed. The conclusions can provide references to control water inrush from floor aquifer in coal mines.
VL  - 6
IS  - 6
ER  -

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Author Information

Baohua Guo

Collaborative Innovation Center of Coal Work Safety, Jiaozuo, China
Feng Jiao

Collaborative Innovation Center of Coal Work Safety, Jiaozuo, China
Xiaoyu Yang

Shendong Coal Group Company, China Shenhua Energy Company Limited, Erdos, China

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Plain Text BibTeX RIS

APA Style

Baohua Guo, Feng Jiao, Xiaoyu Yang. (2017). Critical Break Length of Floor Aquiclude During Longwall Mining Above Confined Aquifer. Earth Sciences, 6(6), 149-156. https://doi.org/10.11648/j.earth.20170606.17

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ACS Style

Baohua Guo; Feng Jiao; Xiaoyu Yang. Critical Break Length of Floor Aquiclude During Longwall Mining Above Confined Aquifer. Earth Sci. 2017, 6(6), 149-156. doi: 10.11648/j.earth.20170606.17

Copy | Download

AMA Style

Baohua Guo, Feng Jiao, Xiaoyu Yang. Critical Break Length of Floor Aquiclude During Longwall Mining Above Confined Aquifer. Earth Sci. 2017;6(6):149-156. doi: 10.11648/j.earth.20170606.17

Copy | Download

@article{10.11648/j.earth.20170606.17,
  author = {Baohua Guo and Feng Jiao and Xiaoyu Yang},
  title = {Critical Break Length of Floor Aquiclude During Longwall Mining Above Confined Aquifer},
  journal = {Earth Sciences},
  volume = {6},
  number = {6},
  pages = {149-156},
  doi = {10.11648/j.earth.20170606.17},
  url = {https://doi.org/10.11648/j.earth.20170606.17},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.earth.20170606.17},
  abstract = {Floor water inrushes not only cause heavy casualties and property losses, but seriously restrict the production of coal mines. The aquiclude was simplified as the fixed - fixed beam under the uniform load, and critical break length formula of floor aquiclude in three failure modes including bending failure, shear failure and buckling of pressure bar were established. Then the critical lengths of aquiclude in three failure modes were calculated according to the geological and mining conditions of 15031 panel in Jiulishan coalmine. The results show that the critical break length in bending failure is the smallest, while the critical length in shear failure mode is the biggest. And failures of fixed – fixed beam in three failure modes all occur at two ends so that water inrush from floor may occur at open-off cut or working face. Additionally, three critical break lengths increase with aquiclude thickness but decrease with confined aquifer pressure. According to the calculated results, water inrush may occur at the working face or open-off cut when mining advance reaches 12.47 m, and thus three control measures of lowering aquifer pressure, increasing aquiclude thickness and shortening the distances of first and interval weighting of main roof were discussed. The conclusions can provide references to control water inrush from floor aquifer in coal mines.},
 year = {2017}
}

Copy | Download

TY  - JOUR
T1  - Critical Break Length of Floor Aquiclude During Longwall Mining Above Confined Aquifer
AU  - Baohua Guo
AU  - Feng Jiao
AU  - Xiaoyu Yang
Y1  - 2017/11/02
PY  - 2017
N1  - https://doi.org/10.11648/j.earth.20170606.17
DO  - 10.11648/j.earth.20170606.17
T2  - Earth Sciences
JF  - Earth Sciences
JO  - Earth Sciences
SP  - 149
EP  - 156
PB  - Science Publishing Group
SN  - 2328-5982
UR  - https://doi.org/10.11648/j.earth.20170606.17
AB  - Floor water inrushes not only cause heavy casualties and property losses, but seriously restrict the production of coal mines. The aquiclude was simplified as the fixed - fixed beam under the uniform load, and critical break length formula of floor aquiclude in three failure modes including bending failure, shear failure and buckling of pressure bar were established. Then the critical lengths of aquiclude in three failure modes were calculated according to the geological and mining conditions of 15031 panel in Jiulishan coalmine. The results show that the critical break length in bending failure is the smallest, while the critical length in shear failure mode is the biggest. And failures of fixed – fixed beam in three failure modes all occur at two ends so that water inrush from floor may occur at open-off cut or working face. Additionally, three critical break lengths increase with aquiclude thickness but decrease with confined aquifer pressure. According to the calculated results, water inrush may occur at the working face or open-off cut when mining advance reaches 12.47 m, and thus three control measures of lowering aquifer pressure, increasing aquiclude thickness and shortening the distances of first and interval weighting of main roof were discussed. The conclusions can provide references to control water inrush from floor aquifer in coal mines.
VL  - 6
IS  - 6
ER  -

Copy | Download