【摘要】 <正> 引言 地下水是地震前兆研究中的一个重要问题。除地下水自身的活动和物理、化学性质的变化可作为地震前兆外,水分还影响地壳岩石的强度、破裂特征和形变、波速、电阻率等一系列地震前兆的特征。因此,人们在探索地震前兆机理和影响因素时,做了许多工作以阐明水分的作用。 微震活动的b值和m值的变化作为地震前兆已经研究了二十多年。目前已积累了更多还原

【Abstract】 The acoustic emission before the rupture of wet ground samples is experimentally examined under the uniaxial stress condition. The rock samples are Changpdng granite, Jinan gabbro, Xiaolongdi malmstone, Diancangshan marble and Fangshan griot-te. The test shows that the acoustic emission rate before the rupture of the waterbearing rock samples is lower than that of dry rocks, but the variation law of the acoustic emission rate is the same to that of dry rocks. The variation law of the 6-va-lue of the acoustic emission is not similar to that of dry rocks and the 6-value increases with the stress increase after the water-bearing of the marble. When the stress is less than the strength 70 percent, the b-value increases as the stress increases after the water-bearing of the other three kinds of rocks; when the stress exceeds the strength 70 percent, the b-value decreases as the stress increases.更多还原