Study on Reasonable Width of Coal Pillars in Pre-mining Top-slicing Fully Mechanized Top-coal Caving Face of Thick Coal Seam

• Published in: Mei kuang an quan Vol. 51; no. 4; pp. 202 - 206, 212
• Main Author: YANG Hengze, LENG Chao, WANG Chao, XIE Wenwu, LIU Chao, HE Hongkun
• Format: Journal Article
• Language: Chinese
• Published: Editorial Office of Safety in Coal Mines 01.04.2020
• Subjects: distribution of plastic zone; fully mechanized mining face; reasonable width; thick coal seam; vertical stress
• ISSN: 1003-496X
• DOI: 10.13347/j.cnki.mkaq.2020.04.043

Aiming at the problem of reasonable width of coal pillars in thick seam pre-mining roof slicing fully mechanized mining face, taking 1308 working face of a mine as engineering background, the reasonable width range, stress distribution law and plastic zone distribution characteristics of coal pillars are studied by theoretical analysis, formula calculation and numerical simulation, so as to determine the reasonable width value. Research shows: to ensure that there is no overlapping phenomenon of excessive stress in the middle of the coal pillar, the width of the coal pillar should be greater than 21.9 m. When the width of the coal pillar is between 14 m and 22 m, the elastic zone gradually forms in the middle of the coal pillar. The stress overlap of the two sides of the goaf is stronger, the peak stress is higher, and the stability of the coal pillar is worse. When the width of the coal pillar is between 22 m and 32 m, there is enough elastic zone width in the middle of the coal pillar, and the stress in the