Research on the effect of coal seam inclination on gas migration channels at fully mechanized coal mining face

Pengxiang Zhao, Risheng Zhuo, Shugang Li, Chun Hsing Ho, Haifei Lin, Hui Liu

Research output: Contribution to journalArticle

Abstract

To investigate the mechanical evolution progress of mining-induced pressure-relief gas migration channel in overlying strata fissure at fully mechanized mining working face, physical similarity simulation tests were conducted to experimentally and numerically evaluate the mining process of a coal mine in Heshun, Shanxi Province. The profiles of the gas migration channels were mathematically modeled based on the theory of elliptical zone of mining-induced fissure, using the dip angle of coal seams of working face as the key parameter. The impacts of dip angle of coal seams on the evolution of pressure-relief gas migration channel in overlying strata fissure at the main mining working face were analyzed. Results suggested that the increase in the dip angles of coal seams could reduce the height of the three zones and could expand the average weighting interval; the gas migration channels were formed at lower positions in the overlying strata, resulting in the lower height, width, caving angle, and range; in addition, with the increase of the dip angle, the segregation and propagation rates of the gas migration channel gradually increased, and the fractal dimensions of coal seams are measured in between 1.68, 1.69, and 1.71, displaying an increasing trend. On-site high-level boreholes were arranged to validate the laboratory results. Based on the monitoring, the gas extraction through the high-level borehole field reached 49.94~89.88% of the total gas emission. In general, the average concentration of gas in the upper corner is maintained below 0.27% and the average concentration of gas in the return airway is maintained below 0.32% so as to ensure a safe and an efficient mining environment. The study contributes to the theoretical basis for identification of pressure-relief gas enrichment areas in overlying strata under the effect of dip angle of coal seams.

Original languageEnglish (US)
Article number597
JournalArabian Journal of Geosciences
Volume12
Issue number18
DOIs
StatePublished - Sep 1 2019

Fingerprint

coal mining
coal seam
gas
dip
fissure
relief
borehole
effect
caving
coal mine
monitoring

Keywords

  • Angle of coal seams
  • Gas migration channels
  • High-level boreholes
  • Mining working face
  • Mining-induced overlying strata fissure

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Research on the effect of coal seam inclination on gas migration channels at fully mechanized coal mining face. / Zhao, Pengxiang; Zhuo, Risheng; Li, Shugang; Ho, Chun Hsing; Lin, Haifei; Liu, Hui.

In: Arabian Journal of Geosciences, Vol. 12, No. 18, 597, 01.09.2019.

Research output: Contribution to journalArticle

Zhao, Pengxiang ; Zhuo, Risheng ; Li, Shugang ; Ho, Chun Hsing ; Lin, Haifei ; Liu, Hui. / Research on the effect of coal seam inclination on gas migration channels at fully mechanized coal mining face. In: Arabian Journal of Geosciences. 2019 ; Vol. 12, No. 18.
@article{87b10d69db3b4067a8933a6482c61966,
title = "Research on the effect of coal seam inclination on gas migration channels at fully mechanized coal mining face",
abstract = "To investigate the mechanical evolution progress of mining-induced pressure-relief gas migration channel in overlying strata fissure at fully mechanized mining working face, physical similarity simulation tests were conducted to experimentally and numerically evaluate the mining process of a coal mine in Heshun, Shanxi Province. The profiles of the gas migration channels were mathematically modeled based on the theory of elliptical zone of mining-induced fissure, using the dip angle of coal seams of working face as the key parameter. The impacts of dip angle of coal seams on the evolution of pressure-relief gas migration channel in overlying strata fissure at the main mining working face were analyzed. Results suggested that the increase in the dip angles of coal seams could reduce the height of the three zones and could expand the average weighting interval; the gas migration channels were formed at lower positions in the overlying strata, resulting in the lower height, width, caving angle, and range; in addition, with the increase of the dip angle, the segregation and propagation rates of the gas migration channel gradually increased, and the fractal dimensions of coal seams are measured in between 1.68, 1.69, and 1.71, displaying an increasing trend. On-site high-level boreholes were arranged to validate the laboratory results. Based on the monitoring, the gas extraction through the high-level borehole field reached 49.94~89.88{\%} of the total gas emission. In general, the average concentration of gas in the upper corner is maintained below 0.27{\%} and the average concentration of gas in the return airway is maintained below 0.32{\%} so as to ensure a safe and an efficient mining environment. The study contributes to the theoretical basis for identification of pressure-relief gas enrichment areas in overlying strata under the effect of dip angle of coal seams.",
keywords = "Angle of coal seams, Gas migration channels, High-level boreholes, Mining working face, Mining-induced overlying strata fissure",
author = "Pengxiang Zhao and Risheng Zhuo and Shugang Li and Ho, {Chun Hsing} and Haifei Lin and Hui Liu",
year = "2019",
month = "9",
day = "1",
doi = "10.1007/s12517-019-4742-0",
language = "English (US)",
volume = "12",
journal = "Arabian Journal of Geosciences",
issn = "1866-7511",
publisher = "Springer Verlag",
number = "18",

}

TY - JOUR

T1 - Research on the effect of coal seam inclination on gas migration channels at fully mechanized coal mining face

AU - Zhao, Pengxiang

AU - Zhuo, Risheng

AU - Li, Shugang

AU - Ho, Chun Hsing

AU - Lin, Haifei

AU - Liu, Hui

PY - 2019/9/1

Y1 - 2019/9/1

N2 - To investigate the mechanical evolution progress of mining-induced pressure-relief gas migration channel in overlying strata fissure at fully mechanized mining working face, physical similarity simulation tests were conducted to experimentally and numerically evaluate the mining process of a coal mine in Heshun, Shanxi Province. The profiles of the gas migration channels were mathematically modeled based on the theory of elliptical zone of mining-induced fissure, using the dip angle of coal seams of working face as the key parameter. The impacts of dip angle of coal seams on the evolution of pressure-relief gas migration channel in overlying strata fissure at the main mining working face were analyzed. Results suggested that the increase in the dip angles of coal seams could reduce the height of the three zones and could expand the average weighting interval; the gas migration channels were formed at lower positions in the overlying strata, resulting in the lower height, width, caving angle, and range; in addition, with the increase of the dip angle, the segregation and propagation rates of the gas migration channel gradually increased, and the fractal dimensions of coal seams are measured in between 1.68, 1.69, and 1.71, displaying an increasing trend. On-site high-level boreholes were arranged to validate the laboratory results. Based on the monitoring, the gas extraction through the high-level borehole field reached 49.94~89.88% of the total gas emission. In general, the average concentration of gas in the upper corner is maintained below 0.27% and the average concentration of gas in the return airway is maintained below 0.32% so as to ensure a safe and an efficient mining environment. The study contributes to the theoretical basis for identification of pressure-relief gas enrichment areas in overlying strata under the effect of dip angle of coal seams.

AB - To investigate the mechanical evolution progress of mining-induced pressure-relief gas migration channel in overlying strata fissure at fully mechanized mining working face, physical similarity simulation tests were conducted to experimentally and numerically evaluate the mining process of a coal mine in Heshun, Shanxi Province. The profiles of the gas migration channels were mathematically modeled based on the theory of elliptical zone of mining-induced fissure, using the dip angle of coal seams of working face as the key parameter. The impacts of dip angle of coal seams on the evolution of pressure-relief gas migration channel in overlying strata fissure at the main mining working face were analyzed. Results suggested that the increase in the dip angles of coal seams could reduce the height of the three zones and could expand the average weighting interval; the gas migration channels were formed at lower positions in the overlying strata, resulting in the lower height, width, caving angle, and range; in addition, with the increase of the dip angle, the segregation and propagation rates of the gas migration channel gradually increased, and the fractal dimensions of coal seams are measured in between 1.68, 1.69, and 1.71, displaying an increasing trend. On-site high-level boreholes were arranged to validate the laboratory results. Based on the monitoring, the gas extraction through the high-level borehole field reached 49.94~89.88% of the total gas emission. In general, the average concentration of gas in the upper corner is maintained below 0.27% and the average concentration of gas in the return airway is maintained below 0.32% so as to ensure a safe and an efficient mining environment. The study contributes to the theoretical basis for identification of pressure-relief gas enrichment areas in overlying strata under the effect of dip angle of coal seams.

KW - Angle of coal seams

KW - Gas migration channels

KW - High-level boreholes

KW - Mining working face

KW - Mining-induced overlying strata fissure

UR - http://www.scopus.com/inward/record.url?scp=85073222924&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85073222924&partnerID=8YFLogxK

U2 - 10.1007/s12517-019-4742-0

DO - 10.1007/s12517-019-4742-0

M3 - Article

AN - SCOPUS:85073222924

VL - 12

JO - Arabian Journal of Geosciences

JF - Arabian Journal of Geosciences

SN - 1866-7511

IS - 18

M1 - 597

ER -