携帯型AE計による沿層ボーリングに伴うAE活動の監視に関する研究
1986 年 102 巻 1185 号 p. 777-782
詳細
1986 年 102 巻 1185 号 p. 777-782
A portable acoustic emission counter has been developed to observe seismoacoustic phenomena during boring in coal seam. This original equipment is intrinsically safe and its weight is 0.35kg with the dimentions of 200×100×40mm. The acoustic emission activity is indicated as the total number of acoustic emission ring down counts in digits on, the front pannel of this equipment with LCD display. The acoustic emission activities occured in coal seam during boring were able to be observed with this equipment. This provided usefull information for locating the unstably stressed zone in the coal seam, and eventually presented the results to indicate the possibility of detection of the impending outburst hazard, and of the jamming on borehole.
