對(duì)黃沙坪鉛鋅礦的鉆孔巖芯在剛性壓力機(jī)上進(jìn)行了室內(nèi)AE 試驗(yàn),試驗(yàn)所用的AE 傳感器
頻率范圍為100～1000 Hz。試驗(yàn)證實(shí)灰?guī)r試樣具有明顯的Kaiser 效應(yīng),且在循環(huán)加卸載條件下,能有效地消除試樣存放時(shí)間對(duì)Kaiser 效應(yīng)的影響,所測(cè)垂直方向的原巖應(yīng)力大小與測(cè)點(diǎn)處的自重應(yīng)力非常吻合。
關(guān)鍵詞:地應(yīng)力;聲發(fā)射; Kaiser 效應(yīng)
Abstract :Acoustic emission test s were carried out in the lab with the drill core obtained f rom Huang2 shaping Lead2Zinc Mine on the rigid compression testing machine. The f requency range of the AE sen2 sor used in the test s was f rom 100 to 1000 Hz. Test result s showed that the limestone specimen pro2 duces obvious Kaiser effect . Furthermore , under the conditions of cycling loading , the influence of the storage time of the specimen on the Kaiser effect could be effectively eliminated and the measured ver2 tical in - situ rock st ress was in excellent coincidence with the self - gravity st ress at the survey point .
Key Words :Ground st ress , Acoustic emission , Kaiser effect