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引言 岩石的声发射活动性能够“记忆”岩石所受过的最大应力,这种效应称为凯赛效应。它是Kaiser,J.1953年在金属材料的拉伸试验中首先发现的。后来Goodman(1963)、金川忠等(1977)在岩石压缩试验中也证实了凯赛效应的存在。金川忠等(1978)认为,利用定向钻孔岩芯制备的定向试件声发射活动性的变化,可以确定地壳应力状态。这个应力状态与同一地点的套芯法和水压致裂法原地应力测量结果相比较,有可能估计测量地区应力状态的变化趋势。这对于判断天然断层的稳定性具有十分重要的意义。这个
Introduction Acoustic emission activity of rocks can “remember” the maximum stress experienced by rocks. This effect is called the Kaiser effect. It was Kaiser, which first appeared in 1953 in the examination of metal materials. Later, Goodman (1963), Jinchuan Zhong et al. (1977) also confirmed the existence of Catarix effect in the rock compression test. Jinchuan Zhong et al. (1978) considered that the crustal stress state can be determined by the change of acoustic emission activity of directional specimens prepared by directional drilling core. Compared with the results of in-situ stress measurement of core-sheath method and hydraulic fracturing method in the same place, it is possible to estimate the trend of stress state in the surveyed area. This is very important for judging the stability of natural faults. This one