Technical gazette, Vol. 29 No. 1, 2022.
Original scientific paper
https://doi.org/10.17559/TV-20210410090718
Numerical Simulation on Instability Mechanism of Section Coal Pillar in Shallow Buried Coal Seams
Tielin Shang*
; School of Energy Engineering, Yulin University, Shaanxi Yulin 719000, China
Yuwei Liu
; School of Civil Engineering, Zhengzhou University of Technology, Zhengzhou 450044, China
Yonglu Suo
; College of Energy Engineering, Xi'an University of Science and Technology, Shaanxi Xi'an 710054, China
Jindong Wang
; School of Energy Engineering, Yulin University, Shaanxi Yulin 719000, China
Zhiyi Wang
; School of Energy Engineering, Yulin University, Shaanxi Yulin 719000, China
Abstract
There is abundant coal resource of Jurassic period in Yulin City, and the problem of shallow buried coal seams mining will occur in every mine area. FLAC3D is used to analyze the plastic failure, deformation characteristic, and vertical stress on shallow buried coal seams mining, based on north No. 2 engineering geological conditions of Hongliulin Mining Corporation. In this paper, the results are shown as follows. The plastic failure fields of section coal pillar forming are smaller; the coal seam hosting is shallower. The elastic region of section coal pillar has a relatively large proportion, which is the coal seam first mined. The value of Z-Displacement for the first coal seam is relatively small. However, for the lower coal seam it is relatively big. The value of X-Displacement for each coal seam is relatively small. The coal wall of section coal pillar is in a steady state. The coal seam hosting is deeper; the more distant is from coal wall to peak point abutment pressure. The stress concentration factor for the first coal seam is relatively big. The research conclusion reveals instability mechanism of section coal pillar, while coal seams mining, which provides a theoretical basis for designing width vale and optimizing supporting scheme of section coal pillar, has engineering experience application value to other coalmines in Yulin City.
Keywords
instability mechanism; numerical simulation; section coal pillar
Hrčak ID:
269489
URI
Publication date:
15.2.2022.
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