Instability Control of Roadway Surrounding Rock in Close-Distance Coal Seam Groups under Repeated Mining

Yu Xiong, Dezhong Kong, Zhanbo Cheng, Zhijie Wen, Zhenqian Ma, Guiyi Wu and Yong Liu
Additional contact information
Yu Xiong: College of Mining, Guizhou University, Guiyang 550025, China
Dezhong Kong: College of Mining, Guizhou University, Guiyang 550025, China
Zhanbo Cheng: School of Engineering, University of Warwick, Coventry CV4 7AL, UK
Zhijie Wen: Key Laboratory of Mining Disaster Prevention and Control, Qingdao 266590, China
Zhenqian Ma: College of Mining, Guizhou University, Guiyang 550025, China
Guiyi Wu: College of Mining, Guizhou University, Guiyang 550025, China
Yong Liu: College of Mining, Guizhou University, Guiyang 550025, China

Energies, 2021, vol. 14, issue 16, 1-19

Abstract: In order to solve the problems of roadway stability and easy instability under repeated mining of close-distance coal seam groups, the mechanism and control technology of surrounding rock instability under repeated mining were studied via indoor testing, field testing, physical similarity simulation experiment, and numerical simulation. The results show that the surrounding rock of roadway has low strength, low bearing capacity, and poor self-stabilization ability, and it is vulnerable to engineering disturbances and fragmentation. Affected by the disturbance under repeated mining, the roadway surrounding rock cracks are developed and the sensitivity is strong, and it is prone to large-scale loose and destroyed. The location of the roadway is unreasonable, and the maximum principal stress of the roadway is 3.1 times of the minimum principal stress, which is quite different. Thus, under a large horizontal stress, the surrounding rock undergoes long-range expansion deformation. On the basis of this research, the direction and emphasis of stability control of roadway surrounding rock under repeated mining of coal seam groups in close-distance are shown. A repair scheme (i.e., long bolt + high-strength anchor cable + U-shaped steel + grouting) is proposed, and reduces the risk of roadway instability.

Keywords: close-distance coal seam groups; roadway surrounding rock; stability control; physical similarity simulation; digital image correlation; numerical simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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