Study on Surrounding Rock Failure Law of Gob-Side Entry Based on the Second Invariant of Deviatoric Stress

Xiaozhou Liu (), Hu Xu, Ben Li (), Wenrui He, Xian Liang and Hongchun Xia
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Xiaozhou Liu: College of Civil Engineering and Architecture, Quzhou University, Quzhou 324000, China
Hu Xu: Civil Engineering and Architecture, Foshan University, Foshan 528000, China
Ben Li: Civil Engineering and Architecture, Foshan University, Foshan 528000, China
Wenrui He: College of Civil Engineering and Architecture, Quzhou University, Quzhou 324000, China
Xian Liang: College of Civil Engineering and Architecture, Quzhou University, Quzhou 324000, China
Hongchun Xia: School of Civil Engineering and Architecture, Dalian University, Dalian 116622, China

Sustainability, 2023, vol. 15, issue 13, 1-16

Abstract: The second invariant of deviatoric stress of the coal and rock mass is closely related to the distortion energy driving the deformation and failure of the surrounding rock. Based on the second invariant of deviatoric stress, this study built a global model of gob-side entry with different widths of the coal pillar through numerical analysis, and compared and analyzed the evolution law of the surrounding rock distortion energy, plastic location state, and roadway deformation with the width of the coal pillar. This study concluded that the peak distortion energy in the virgin coal rib and the roof and floor of the gob-side entry gradually increases with the reduction in the coal pillar width. When the coal pillar width is 5 m, the second invariant peak value of deviatoric stress in the virgin coal rib reaches the maximum of 294.8 MPa 2 . When the width of the coal pillar is reduced from 30 m to 5 m, the second invariant of the deviatoric stress in the side of the coal pillar and the roof and floor of the side presents the law of first increasing and then decreasing. The greater the damage degree of the coal pillar, the smaller the distortion energy it contains. The distortion energy is the key factor in driving the deformation and failure of the surrounding rock. The greater the distortion energy, the greater the deformation degree of the surrounding rock, the more vulnerable it is to external mining stress disturbance, and the greater the difficulty in controlling the stability of the roadway-surrounding rock.

Keywords: second invariant of deviatoric stress; surrounding rock; failure law; gob-side entry (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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