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

被引：0
|
作者：
Wang P. [1 ,2 ]
Wang Z. [2 ,3 ]
Luo F. [1 ]
Su Y. [4 ]
Li J. [2 ,3 ]
Wu C. [2 ,3 ]
Zhang Z. [1 ]
机构：
[1] College of Mining and Geomatics Engineering, Hebei University of Engineering, Handan
[2] China and Russia Dynamics Research Center, China University of Mining and Technology-Beijing, Beijing
[3] School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing
[4] China Coal International Engineering Design and Research Institute, Beijing
来源：
Meitan Kexue Jishu/Coal Science and Technology (Peking) | 2023年 / 51卷 / 12期
关键词：
across coal pillar; combined support; extra-thick coal seam; residual coal; slice mining; slip-lines field;
D O I：
10.13199/j.cnki.cst.2022-2092
中图分类号：
学科分类号：
摘要：
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 “Ibeam 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. © 2023 China Coal Society. All rights reserved.
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页码：232 / 242
页数：10
相关论文
共 19 条
  • [11] LIANG Bing, LI Cunzhou, WANG Beifang, Et al., Study on the layout of roadway in the working face of lower layer in 5 # coal seam in haihong coal mine[J], mining safety & environmental protection, 46, 6, (2019)
  • [12] ZHANG Wei, ZHANG Dongsheng, CHEN Jianben, Et al., determining the optimum gateway location for extremely close coal seams[J], Journal of China University of Mining & Technology, 47, 3, (2018)
  • [13] Shaoxuan HU, Xingliang XU, TIAN Suchuan, Et al., Optimization of roadway location in lower coal seam from synergy mechanism of contiguous seam mining[J], Journal of Mining & Safety Engineering, 33, 6, (2016)
  • [14] WANG Zhiqiang, WANG Peng, SHI Lei, Et al., research on prevention of rock burst based on stress analysis of surrounding rock of gob-side entry[J], Journal of China University of Mining & Technology, 49, 6, (2020)
  • [15] WANG Zhiqiang, WANG Peng, LYU Wenyu, Et al., Mechanism and control of asymmetric floor heave in gob-side entry[J], Journal of Mining & Safety Engineering, 38, 2, (2021)
  • [16] pp. 222-223, (2015)
  • [17] Jinhai LIU, JIANG Fuxing, Sitao ZHU, Study of dynamic and static abutment pressure around longwall face and its application[J], Chinese journal of rock mechanics and engineering, 34, 9, (2015)
  • [18] ZHANG Jincai, Tianquan LIU, On depth of fissured zone in seam floor resulted from coal extraction and its distribution characteristics[J], Journal of China Coal Society, 15, 2, (1990)
  • [19] pp. 328-334, (2020)
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