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Stability Analysis and Derived Control Measures for Rock Surrounding a Roadway in a Lower Coal Seam under Concentrated Stress of a Coal Pillar by Zhuoyue Sun; Yongzheng Wu; Zhiguo Lu; Youliang Feng; Xiaowei Chu; Kang Yi is a Engineering article available to read on EtoBox.

What is Stability Analysis and Derived Control Measures for Rock Surrounding a Roadway in a Lower Coal Seam under Concentrated Stress of a Coal Pillar about?

Numerical simulations have often been used in close-distance coal seam studies. However, numerical simulations can contain certain subjective and objective limitations, such as high randomness and excessively simplified models. In this study, close-distance coal seams were mechanically modeled based on the half-plane theory. An analytical solution of the floor stress distribution was derived and visualized using Mathematica software. The principal stress difference was regarded as a stability criterion for the rock surrounding the roadway. Then, the evolution laws of the floor principal stress difference under different factors that influence stability were further examined. Finally, stability control measures for the rock surrounding the roadway in the lower coal seam were proposed. The results indicated the following: (1) The principal stress difference of the floor considers the centerline of the upper coal pillar as a symmetry axis and transmits radially downward. The principal stress difference in the rock surrounding the roadway gradually decreases as the distance from the upper coal pillar increases and can be ranked in the following order: left rib > roof > right rib. (2) T

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Author

Zhuoyue Sun; Yongzheng Wu; Zhiguo Lu; Youliang Feng; Xiaowei Chu; Kang Yi

Publisher

Hindawi Limited; Hindawi Publishing Corporation (ISSN 1070-9622)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)