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Evolution law of mining-induced overburden stratum stress and fracture fields in inclined coal seam

Haodong Fan (School of Mining and Geomatics Engineering, Hebei University of Engineering, Handan, China)
Feng Luo (School of Mining and Geomatics Engineering, Hebei University of Engineering, Handan, China; Technology Innovation Center of Coal Mine Construction of Hebei Province, Handan, China and Handan Key Laboratory for Ground Control and Disaster Prevention of Deep Roadways, Handan, China)
Shuai Gao (School of Mining and Geomatics Engineering, Hebei University of Engineering, Handan, China)
Meng Li (School of Mining and Geomatics Engineering, Hebei University of Engineering, Handan, China)
Zhen Lv (School of Mining and Geomatics Engineering, Hebei University of Engineering, Handan, China)
Geng Sun (School of Mining and Geomatics Engineering, Hebei University of Engineering, Handan, China)

World Journal of Engineering

ISSN: 1708-5284

Article publication date: 1 March 2023

Issue publication date: 26 April 2024

36

Abstract

Purpose

This study aims to clarify the evolution law of stress field and fracture field during the mining process of inclined coal seam, to prevent the occurrence of roof burst water and impact ground pressure accident during the advancing process of working face.

Design/methodology/approach

The evolution law of stress-fracture field under different mining conditions of inclined coal seam was studied by using discrete element method and similar material simulation method.

Findings

The overburden stress at the lower end of the coal seam was mainly transmitted to the deep rock mass on the left side, and the overburden stress at the upper end was mainly transmitted to the floor direction. With the increase of the inclined length of the mining coal seam, the development of the fracture zone gradually evolves from the “irregular arch” form to the “transversely developed trapezoid” form. The development range of the fracture zone was always in the internal area of the stress concentration shell.

Originality/value

An original element of this paper is based on the condition that the dip angle of coal seam is 35°, and the evolution law of overburden stress-fracture field during the excavation of coal seam with different lengths was analyzed by UDEC numerical simulation software. The coupling relationship between stress shell and fracture field was proposed, and the development range of fracture zone was determined by stress. The value of this paper is to provide technical support and practical basis for the safety production of a mine working face.

Keywords

Acknowledgements

This research is financially supported by the Natural Science Foundation of Hebei Province (E2020402041), 333 Talent Project Foundation of Hebei Province(C20221027), Research Foundation for introduced overseas talents of Hebei Province(C20220310).Conflict of interest: The authors declare that they have no conflict of interest.

Citation

Fan, H., Luo, F., Gao, S., Li, M., Lv, Z. and Sun, G. (2024), "Evolution law of mining-induced overburden stratum stress and fracture fields in inclined coal seam", World Journal of Engineering, Vol. 21 No. 3, pp. 475-486. https://doi.org/10.1108/WJE-11-2022-0470

Publisher

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Emerald Publishing Limited

Copyright © 2023, Emerald Publishing Limited

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