细晶花岗岩的声发射特征试验研究

对葡萄牙细晶花岗岩同一岩样进行多次单轴压缩循环加卸载试验,监测试验过程中岩样的声发射活动,记录岩样的变形特征,分析总结声发射与变形之间的相互关系。试验表明,葡萄牙细晶花岗岩在高应力状态下凯塞效应明显,所受应力越高,凯塞效应越弱;在判断岩石凯塞点时,因时间–累计声发射能量曲线中拐点明显,比利用时间–累计声发射事件数曲线更容易、更合理;另外,了解试样的变形特征对解释声发射试验结果是一个有益的补充。

Acoustic emission behaviors of aplite granite

Aiming at the acoustic emission behaviors of aplite granite in Portugal,several uniaxil compressive tests with cyclic loadings were carried out on the same rock sample for monitoring acoustic emission activities and recording deformation of rock in order to acquire the relationship between them.It was found that the more the stress exerted on the rock sample,the weaker Kaiser effect became.But in balance,Kaiser effect existed profoundly in aplite granite even when the specimen was under high stress.To determine Kaiser point,using time-cumulative energy curve was easier and more reasonable than using time-cumulative AE events curve,as the inflection point in time-cumulative energy curve was so easy to be obtained.Furthermore,a good understanding on compression-deformation behavior of rock was a beneficial supplement for the explanation of acoustic emission test results.