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Open AccessArticle

Physical Experiment and Numerical Modeling on the Failure Mechanism of Gob-Side Entry Driven in Thick Coal Seam

1
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
2
Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo, Nagasaki 852-8521, Japan
*
Author to whom correspondence should be addressed.
Energies 2020, 13(20), 5425; https://doi.org/10.3390/en13205425
Received: 7 September 2020 / Revised: 8 October 2020 / Accepted: 13 October 2020 / Published: 17 October 2020
(This article belongs to the Section Energy Sources)
In this paper, a combination of physical model tests and numerical simulations were carried out to explore the overlying strata movement laws, failure mechanism, and cracks evolution of the gob-side entry driven in a thick coal seam. The physical experimental results indicated that the hanging cantilever beam was easily developed above the coal pillar after mining out the 2101 panel, resulting in a larger and stronger stress concentration. The overburden loads acting on the coal pillar can be greatly released after the hanging roof strata were cut down with an 18 m cutting line. Additionally, we adopted Universal Discrete Element Code (UDEC) software to investigate the deformation and crack evolution mechanism of the gob-side entry under different conditions. The primary-supported roadway underwent severe deformation, filling with a great quantity of tensile and shear cracks to the inner coal pillar. Both the physical and numerical results proved that the optimized-support parameters combined with roof-cutting measures could effectively guarantee the stability of the gob-side entry. This research can provide valuable guidance for the stability control of the gob-side entry in mines under similar conditions. View Full-Text
Keywords: physical experiment; numerical modeling; gob-side entry; failure mechanism; crack evolution physical experiment; numerical modeling; gob-side entry; failure mechanism; crack evolution
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MDPI and ACS Style

Shi, X.; Jing, H.; Zhao, Z.; Gao, Y.; Zhang, Y.; Bu, R. Physical Experiment and Numerical Modeling on the Failure Mechanism of Gob-Side Entry Driven in Thick Coal Seam. Energies 2020, 13, 5425.

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