Research on Deformation and Failure Control Technology of a Gob-Side Roadway in Close Extra-Thick Coal Seams

Bin Zhao, Shengquan He (), Xueqiu He, Le Gao, Zhenlei Li, Dazhao Song and Feng Shen
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Bin Zhao: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Shengquan He: School of Civil and Resources Engineering, University of Science & Technology Beijing, Beijing 100083, China
Xueqiu He: School of Civil and Resources Engineering, University of Science & Technology Beijing, Beijing 100083, China
Le Gao: School of Civil and Resources Engineering, University of Science & Technology Beijing, Beijing 100083, China
Zhenlei Li: School of Civil and Resources Engineering, University of Science & Technology Beijing, Beijing 100083, China
Dazhao Song: School of Civil and Resources Engineering, University of Science & Technology Beijing, Beijing 100083, China
Feng Shen: School of Civil and Resources Engineering, University of Science & Technology Beijing, Beijing 100083, China

Sustainability, 2022, vol. 14, issue 18, 1-23

Abstract: Close extra-thick coal seams are subject to the broken overburden of mined coal seams, and the deformation and damage of the roadways is serious, which affects the safe operation of the mine. To reduce the deformation and damage of the roadways, this paper studied the deformation and damage law of the gob-side roadway in close extra-thick coal seams through numerical simulation and field monitoring, compared and analyzed the deformation and damage characteristics of the roadway under different reinforcement support methods, determined the optimal reinforcement support method, and carried out field verification. The obtained results indicated that the deformation and damage of the gob-side roadway showed asymmetric characteristics. The large deformation of the coal body in the deep part of the roadway wall is an important reason for the continuous occurrence of roadway wall heave in the coal pillar. Under the action of unbalanced support pressure, the floor is subject to the coupling effect of horizontal extrusion pressure and vertical stress that cause extrusion mobility floor heave. The horizontal and vertical displacement of the coal pillar side of the roadway under different support methods is much larger than that of the solid coal side. Increasing the anchor cable length and fan-shaped arrangement can improve the support effect. Grouting at the coal pillar side can significantly improve the bearing capacity and stability of the coal pillar. The effect of floor grouting is much better than the anchor cable in controlling the floor heave. The integrated reinforcement method of anchor cable + coal pillar side grouting + floor grouting has the best effect with the least horizontal and vertical deformation. The research results are of great significance for ensuring the stability of similarly endowed roadways.

Keywords: close distance coal seams; roadway support; roadway deformation; grouting reinforcement; control technology (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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