着炭ぎわの立入掘進におけるAE活動の計測
ガス突出に伴うAE活動に関する研究 (第1報)
1988 年 104 巻 1206 号 p. 495-503
詳細
1988 年 104 巻 1206 号 p. 495-503
In this study, the acoustic emission activity occurring prior to coal and gas outburst had been observed in the drivages at intersection with the outburst-prone coal seam in SUNAGAWA Coal Mine since 1979. During the observations, the acousticemission activities from the coal and gas outbursts were successfully monitored three times.
As above observational results, the acoustic emission activity occurring after blasting increased and decreased remarkably in the approaching process of driving face to the outburst-prone seam. These results prove that the fracturing activity in the source of coal and gas outburst became at a high degree temporarily. After that the fracturing activity became at a low degreegradually. Consequently, the increase and decrease in
