Investigation on rational width of coal pillar and roadway support in isolated panel of extra-thick coal seam

Xiang He; Xiang He; Xiang He; Shuxin He; Shuxin He; Shuxin He; Yongbo Cai; Yongbo Cai; Ruiyang Xu; Ke Yang; Ke Yang

doi:10.3389/feart.2023.1125678

Frontiers in Earth Science (Feb 2023)

Investigation on rational width of coal pillar and roadway support in isolated panel of extra-thick coal seam

Xiang He,
Xiang He,
Xiang He,
Shuxin He,
Shuxin He,
Shuxin He,
Yongbo Cai,
Yongbo Cai,
Ruiyang Xu,
Ke Yang,
Ke Yang

Affiliations

Xiang He: Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining, Anhui University of Science and Technology, Huainan, Anhui, China
Xiang He: Hefei Comprehensive National Science Center, Institute of Energy, Hefei, Anhui, China
Xiang He: School of Mining Engineering, Anhui University of Science and Technology, Huainan, Anhui, China
Shuxin He: Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining, Anhui University of Science and Technology, Huainan, Anhui, China
Shuxin He: Hefei Comprehensive National Science Center, Institute of Energy, Hefei, Anhui, China
Shuxin He: School of Mining Engineering, Anhui University of Science and Technology, Huainan, Anhui, China
Yongbo Cai: Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining, Anhui University of Science and Technology, Huainan, Anhui, China
Yongbo Cai: Emergency Science Research Institute, Chinese Institute of Coal Science, Beijing, China
Ruiyang Xu: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing, China
Ke Yang: Hefei Comprehensive National Science Center, Institute of Energy, Hefei, Anhui, China
Ke Yang: School of Mining Engineering, Anhui University of Science and Technology, Huainan, Anhui, China

DOI: https://doi.org/10.3389/feart.2023.1125678
Journal volume & issue: Vol. 11

Abstract

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The methods of numerical simulation and on-site measurement is used to analysis reasonable coal pillar width (CPW) and roadway support in isolated panel of extra-thick coal seam. Numerical modeling shows that a maximum vertical stress in isolated panel is 32.9 MPa, and stress concentration factor reaches 2.99, which is more affected by the mining of adjacent panel, and the peak stress on both sides is higher. By comparing the failure and deformation characteristics of different pillar widths, it is shown that a 6 m pillar can reach the load requirements of overlying strata and ensure that the roadway is in an undamaged and controllable environment. According to the asymmetry of surrounding rock deformation, the final joint control technology of asymmetric anchor cables, high intensity anchor cables, and coal pillar grouting is proposed and get good control effect on site. The research results provide guidance value for surrounding rock control under similar geological condition.

Published in Frontiers in Earth Science

ISSN: 2296-6463 (Online)
Publisher: Frontiers Media S.A.
Country of publisher: Switzerland
LCC subjects: Science
Website: https://www.frontiersin.org/journals/earth-science

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