Remnant coal pillar stress distribution and cross-pillar roadway layout control technology in extra-thick coal seam

WANG Peng; WANG Zhiqiang; LUO Feng; SU Yue; LI Jingkai; WU Chao; ZHANG Zhiyao

doi:10.13199/j.cnki.cst.2022-2092

Volume 51 Issue 12

Dec. 2023

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COAL SCIENCE AND TECHNOLOGY > 2023 > 51(12): 232-242. > DOI: 10.13199/j.cnki.cst.2022-2092

WANG Peng，WANG Zhiqiang，LUO Feng，et al. Remnant coal pillar stress distribution and cross-pillar roadway layout control technology in extra-thick coal seam[J]. Coal Science and Technology，2023，51（12）：232−242

. DOI: 10.13199/j.cnki.cst.2022-2092

Citation:

. DOI: 10.13199/j.cnki.cst.2022-2092

Citation:

. DOI: 10.13199/j.cnki.cst.2022-2092

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Remnant coal pillar stress distribution and cross-pillar roadway layout control technology in extra-thick coal seam

WANG Peng^{1, 2,},
WANG Zhiqiang^{2, 3, ,},
LUO Feng¹,
SU Yue⁴,
LI Jingkai^{2, 3},
WU Chao^{2, 3},
ZHANG Zhiyao¹

1.
College of Mining and Geomatics Engineering, Hebei University of Engineering, Handan 056038, China
2.
China and Russia Dynamics Research Center, China University of Mining and Technology-Beijing, Beijing 100083, China
3.
School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China
4.
China Coal International Engineering Design and Research Institute, Beijing 100120, China

Funds:

National Natural Science Foundation of China (52074291)； Natural Science Foundation of Hebei Province (E2020402048); College Student Innovation Training Funding Project (X202310076072)

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Received Date: December 07, 2022
Available Online: November 07, 2023

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Abstract

Abstract

The paper aims to determine the reasonable layout and stability control scheme of the mining roadway under the influence of remnant coal pillars in the multi-slice longwall mining of the extra thick coal seam in Laogong Yingzi Coal Mine. Combining field monitoring, theoretical analysis and numerical simulation, the stress distribution characteristics of the remnant coal pillar and the coal in the lower slice are studied to compare and analyze the stress states of the surrounding rock of roadways at different locations, the roadway layout across the remnant coal pillar is proposed, and a mechanical model of the floor slip line field is established. The model takes the width of the stress increasing area as the width of the bar-shaped foundation, the roadway layout scheme of 4 m horizontal distance from the remnant coal pillar iss determined. Combining with the roadway layout characteristics, the active and passive combined support scheme of “I-beam steel sets + cable bolts + shotcrete + shallow hole low-pressure grouting” is proposed. The results show that there is a double peak stress concentration both within the remnant coal pillar and the lower coal slice after mining on both sides of the upper slice. Inside the coal pillar is the vertical stress concentration zone, and at the edge of the coal pillar is the shear stress concentration zone. External spaced overlapped roadway is influenced both by vertical and shear stresses. The stress concentration of external spaced overlapped roadway is the highest followed by vertical overlapped roadway and increases with the increase of the outer staggered distance. The influence of the shear stress is more obvious for vertical overlapped roadway. The influence of the vertical stress and shear stress on the roadway layout across the remnant coal pillar is significantly reduced, and the peak value of the vertical stress stabilizes at 34.1 MPa. The peak shear stress stabilizes at 6.7 MPa, and the stress concentration is the lowest and decreases with the increase of the interval of the two roadways. Field application results show that the deformation of roadway surrounding rock across the remnant coal pillar is small, and there is no intensive pressure observed, which meets the requirements of safety production.
- extra-thick coal seam,
- slice mining,
- residual coal,
- slip-lines field,
- across coal pillar,
- combined support

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References

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Remnant coal pillar stress distribution and cross-pillar roadway layout control technology in extra-thick coal seam

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