Study on Failure Characteristics and Control Technology of Roadway Surrounding Rock under Repeated Mining in Close-Distance Coal Seam

Yuqi Shang, Dezhong Kong, Shijiang Pu, Yu Xiong, Qiang Li and Zhanbo Cheng
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Yuqi Shang: College of Mining, Guizhou University, Guiyang 550025, China
Dezhong Kong: College of Mining, Guizhou University, Guiyang 550025, China
Shijiang Pu: Faculty of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
Yu Xiong: College of Mining, Guizhou University, Guiyang 550025, China
Qiang Li: College of Mining, Guizhou University, Guiyang 550025, China
Zhanbo Cheng: School of Engineering, University of Warwick, Coventry CV4 7AL, UK

Mathematics, 2022, vol. 10, issue 13, 1-18

Abstract: In this study, taking the Sheng’an coal mine as an engineering background, the failure characteristics of the surrounding rock of a roadway under repeated mining in a close-distance coal seam is comprehensively illustrated through field measurements (e.g., drilling imaging), theory analysis and numerical simulation (finite difference method (FDM)). The results show that although the return airway 10905 remains intact, the apparent failure of the roadway’s roof and the coal pillar can be observed. In addition, the expression of floor failure depth caused by upper coal seam mining is obtained through elastic-plastic theory. Meanwhile, the deformation of the surrounding rock of the roadway increases with the increase of repeated mining times, especially for the horizontal displacement of the roadway on the coal pillar side. Moreover, the cracks’ evolution of surrounding rock in the roadway can be observed as asymmetric characteristics. Finally, the stability control technology of “asymmetric anchor net cable + I-steel” is proposed to prevent potential mining disasters, and the feasibility of this support scheme is verified by numerical simulation and field practices. It can meet the requirement of safe mining and provide guidelines to effectively solve the failure of a roadway in close-distance coal seam mining.

Keywords: failure characteristics; surrounding rock of roadway; repeated mining; close-distance coal seam; stability control technology (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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