Influence of a Large Pillar on the Optimum Roadway Position in an Extremely Close Coal Seam

• Published in: Journal of engineering science and technology review 2016, Vol.9 (1), p.159-166
• Main Authors: Yang, Li, Shuai, Zhang, Jia - zhuo, Li, An - ying, Yuan, Zhen - quan, Zhang, Chen, Wang
• Format: Article
• Language: English
• Subjects: Extremely close coal seam; Large pillar; Optimum position; Roadway
• ISSN: 1791-9320; 1791-2377; 1791-2377
• DOI: 10.25103/jestr.091.24

Based on the mining practice in an extremely close coal seam, theoretical analysis was conducted on the vertical stress distribution of the floor strata under a large coal pillar. The vertical stress distribution regulation of a No. 5 coal seam was revealed. To obtain the optimum position of the roadway that bears the supporting pressure of a large coal pillar, numerical modeling was applied to analyze the relation among the stress distribution of the roadway surrounding the rock that bears the supporting pressure of a large coal pillar, the plastic zone distribution of the roadway surrounding the rock, the surrounding rock deformation, and the roadway layout position. The theoretical calculation results of the stress value, stress variation rate, and influencing range of the stress influencing angle showed that the reasonable malposition of the No. 5 coal seam roadway was an inner malposition of 4 m. The mining practice showed the following: the layout of No. 25301 panel belt roadway at the position of the inner malposition of 4 m was reasonable, the roadway support performance was favourable without deformation, and ground pressure was not obvious. The research achievement of this study is the provision of a reference for roadway layouts under similar conditions.