在超声作用下岩石射气异常行为与微破裂特征

通过实验证实,超声作用可提高岩石射气水平,每经历一次超声振动,其射气水平都有更明显的增长;使用麦吉斯肯2型图象分析系统,首次对振动后的岩石进行了微破裂特征的定量分析,并得出微破裂的程度与振动次数有明显的正相关性;确认于超声作用下,岩石射气的异常行为与微破裂特征有本质的联系.但是超声振动时,岩石的射气强度不能作为预测地震震级的判据,而振动结束后,其射气能力并无改变. 

ANOMALOUS BEHAVIOR OF EMANATION AND MICROFRAC-TURING CHARACTERISTICS OF ROCK UNDER ULTRASONIC ACTION

By experiments,it is confirmed that ultrasonic action may raise the emanation of rock to a higher level; the emanation is more obviouslsly increased,when undergoing ultrasonic vibration each time A quantitative analysis of fracturing characteristic of rock after ultrasonic vibration (u.v.) has been made for the first time by a Magiscan Type 2 image-analysis system,obtaining a clear positive correlation between the degree of microfracturing and the times of u.v.; thus it is affirmed that there is an essential relation between anomalous behavior of emanation and microfracturing characteristics of rock under ultrasonic action. This paper also discusses on the basis of experiments that rock did not increase its emanation ability.,though microfracturing that occurred in it after u.v.; and emanation intensity can not be regarded as criterion for forecasting earthquake magnitude.