Citation

Hou J, Zhao N, Li J, Dong X, Yu Z, Fan T. China Saf. Sci. J. 2022; 32(12): 70-78.

Copyright

(Copyright © 2022, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2022.12.1877

PMID

unavailable

Abstract

In order to solve the stability problem of surrounding rock after roof cutting and retaining roadway in deep sandstone direct⁃covered working face of Huainan mining area, the technical principle of deep and shallow hole combined blasting roof cutting and retaining roadway was firstly analyzed. The deep hole pre⁃splitting blasting technology was used to make the main roof break and collapse, and the energy⁃ gathering blasting technology was used to directionally cut the direct roof. Then, according to the theoretical analysis, the scheme of deep and shallow hole combined blasting was determined, and the stress distribution characteristics of three different roof cutting working faces of uncut roof, cut direct roof and deep and shallow hole combined blasting were analyzed by numerical simulation method. Finally, the field study was carried out in 1452 (1) sandstone working face of Dingji mine. The research shows that the surrounding rock control technology of deep⁃shallow hole combined blasting roof cutting entry retaining can better block the stress transfer between overburden strata and improve the stress environment of entry retaining roof. In the advancing direction of the working face, the periodic weighting step is reduced, and the weighting strength is gentle. In the retaining roadway, the length of the hanging roof above the retaining roadway is reduced to form a short wall beam, which effectively reduces the stress of the surrounding rock of the retaining roadway and better controls the deformation of the surrounding rock. © 2022 China Safety Science Journal. All rights reserved.

Language: zh