Influence of fracture types of main roof on the stability of surrounding rock of the gob-side coal-rock roadway in inclined coal seams and its engineering application

Authors

GAO Lin, Mining College, Guizhou University, Guiyang 550025, China; Research Center of Roadway Support and Disaster Prevention Engineering in Coal Industry, China University of Mining and Technology (Beijing), Beijing 100083, China; National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guizhou University, Guiyang 550025, China; Guizhou Engineering Center for Safe Mining Technology Under Complex Geologic Condition, Guizhou University, Guiyang 550025, ChinaFollow
LIU Pengze, Mining College, Guizhou University, Guiyang 550025, China
ZHANG Pandong, Mining College, Guizhou University, Guiyang 550025, China
WU Guiyi, Mining College, Guizhou University, Guiyang 550025, China; National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guizhou University, Guiyang 550025, China; Guizhou Engineering Center for Safe Mining Technology Under Complex Geologic Condition, Guizhou University, Guiyang 550025, China
KANG Xiangtao, Mining College, Guizhou University, Guiyang 550025, China; National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guizhou University, Guiyang 550025, China; Guizhou Engineering Center for Safe Mining Technology Under Complex Geologic Condition, Guizhou University, Guiyang 550025, China

Abstract

Due to the asymmetry and heterogeneity of surrounding rock structure, the surrounding rock of the gob-side coal-rock roadway in inclined coal seams presents more serious deformation and failure under the influence of driving and mining. To reveal the influence of different main roof fracture types on the stability of surrounding rock of the gob-side coal-rock roadway in inclined coal seams, the deformation characteristics of surrounding rock under four main roof fracture types of this kind of roadway are studied by numerical simulation. The results show that the influence degree from highest to lowest of the position of the fracture line of main roof on the surrounding rock stability of this kind of roadway is as follows: goaf, coal pillar, coal wall, top of the roadway; when the fracture line of main roof is located at the goaf, the growth rate of axial and transverse stress of the coal pillar is less than that in other cases, the vertical displacement is also the smallest, and the coal pillar deformation is within the allowable range, which can maintain the support capacity of the roof in the later stage and is the most favorable for roadway maintenance. On the basis of this research, the industrial test is carried out with return air roadway of working face 1511 of a mine in Guizhou Province as the engineering background. Through theoretical calculation and comprehensive analysis of on-site borehole detection, it is concluded that for the purpose of avoiding the fracture line of main roof being above the coal pillar and close to the roadway, the coal pillar width should be changed from 3m to 5m in the next excavation. The test results of section during driving and mining show that the maximum shrinkage rate of section is 23.3%, the maximum asymmetric deformation rate, 5.2%, and the overall uniform and coordinated deformation of roadway further verifies the reliability of the research results.

Keywords

surrounding rock stability, coal-rock roadway, fracture position of the main roof, influence law, gob-side roadway, pillar width, inclined coal seam

DOI

10.12363/issn.1001-1986.21.10.0588

Recommended Citation

GAO Lin, LIU Pengze, ZHANG Pandong, et al. (2022) "Influence of fracture types of main roof on the stability of surrounding rock of the gob-side coal-rock roadway in inclined coal seams and its engineering application," Coal Geology & Exploration: Vol. 50: Iss. 6, Article 9.
DOI: 10.12363/issn.1001-1986.21.10.0588
Available at: https://cge.researchcommons.org/journal/vol50/iss6/9

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