TY - JOUR
TI - Coal pillar's breaking and fracture development mechanism and numerical simulation
AU - Teng Fei
AU - Yu Minggao
AU - Chao Jiangkun
AU - Ma Zhihui
JN - Thermal Science
PY - 2022
VL - 26
IS - 3
SP - 2439
EP - 2446
PT - Article
AB - This study explores the influence of a repeated mining process on an upper  coal pillar in a close coal seam group. The pillar's breaking and  instability processes are emphasized, and the influence of fracture  development on the oxidation and spontaneous combustion of coal pillars is  revealed. A numerical simulation is used to simulate the dynamic evolution  characteristics of stress, displacement of the upper coal pillar, and the  numerical results elucidate that the mining of the lower adjacent coal seam  is a pressure relief process for the upper coal pillar. The theoretical  length of the fracture along the strike of the upper coal pillar is also  obtained for the upper coal pillar.