Study on the Dip Angle Effect of Asymmetric Deformation and Failure of the Gob-Side Coal–Rock Roadway in Gently Inclined Coal Seam

Lin Gao, Xinyu Zhan, Pandong Zhang, Zhijie Wen, Zhenqian Ma, Dezhong Kong, Xiangtao Kang and Sen Han
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Lin Gao: College of Mining, Guizhou University, Guiyang 550025, China
Xinyu Zhan: College of Mining, Guizhou University, Guiyang 550025, China
Pandong Zhang: College of Mining, Guizhou University, Guiyang 550025, China
Zhijie Wen: Key Laboratory of Mining Disaster Prevention and Control, Qingdao 266590, China
Zhenqian Ma: College of Mining, Guizhou University, Guiyang 550025, China
Dezhong Kong: College of Mining, Guizhou University, Guiyang 550025, China
Xiangtao Kang: College of Mining, Guizhou University, Guiyang 550025, China
Sen Han: College of Mining, Guizhou University, Guiyang 550025, China

Sustainability, 2022, vol. 14, issue 12, 1-15

Abstract: In order to reveal the influence law of coal seam dip angle on the stability of the surrounding rock of the gob-side coal–rock roadway in a gently inclined coal seam (GCRGICS), the deformation characteristics of the surrounding rock under four different coal seam dip angles of this kind of roadway were studied by field investigation, theoretical analysis and numerical simulation. The results showed that, with the increase of the coal seam dip angle, the amount of the roadway roof subsidence and the deformation of the upper and lower side arc triangle coal along the coal–rock interface increased, and the maximum deformation was 479 and 950 mm, respectively, and the maximum slip deformation area gradually shifted from the upper side arc triangle coal to the lower side arc triangle coal. The asymmetric deformation characteristics of the surrounding rock became more and more obvious. The asymmetric deformation rate of the GCRGICS showed a V-shaped variation relationship with the coal seam dip angle, when the coal seam dip angle was 10°, the asymmetric deformation rate was the minimum, only 1.1%. The plastic zone of the surrounding rock expanded with the increase of the coal seam dip angle, and the new extension range was mainly located in the roof area of the roadway.

Keywords: dip angle of coal seam; coal–rock roadway; gob-side roadway; coal–rock interface; asymmetric deformation (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 (3)

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