Spatiotemporal evolution of coal spontaneous combustion in longwall gobs: A case study from mining discontinuation to resumption

Abstract

Coal spontaneous combustion has always been a major issue in mine production, which mainly occurs in longwall gobs. The active functional groups in the coal surface molecules react with oxygen molecules and release heat. [1][2][3] When the oxygen supply is sufficient and the heat storage condition is good, the heat released by the oxidation reaction accumulates continuously and causes the coal temperature to rise. This can ultimately result in spontaneous combustion in the gobs.

Stability and Control of Retracement Channels in Thin Seam Working Faces with Soft Roof

“…erefore, reasonable excavation and support technology is particularly important [3][4][5]. Generally, the layout methods of retracement channels used in coal mines include the preexcavation double retracement channel [6][7][8], pre-excavation single retracement channel [8,9], and no pre-excavation retracement channel [10,11]. Among them, no pre-excavation retracement channel technology has been widely used due to the advantages of flexible selection of the stopping line.…”