Citation

Li G, Liu H, Yang Q, Niu W. China Saf. Sci. J. 2022; 32(5): 68-76.

Copyright

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

DOI

10.16265/j.cnki.issn1003-3033.2022.05.1535

PMID

unavailable

Abstract

In order to study characteristics of floor failure under mining conditions, with working face 10409 of Xinzhi Coal Mine as a research object, distribution characteristics of floor stress field and damage evolution of floor strata were studied in detail by using a combination of theoretical analysis and numerical simulation methods. Then, based on verification results of on⁃site pressurized water test, distribution law of bearing pressure in coal seam floor strata and damage range of floor strata during mining process were obtained. Finally, mining risks of No. 10 coal seam under pressure was analyzed and evaluated. The results show that under influence of mining, the floor of coal seam presents periodic failure of tension failure⁃ compaction⁃tension failure, and the critical value of working face length that affects failure depth of floors is about 160 m. The maximum failure depth of floor strata can reach 9. 50 m, while maximum water inrush risk point lag behind working face is about 2. 6 m. © PHYSOR 2022 China Safety Science Journal. All rights reserved.

Language: zh