AE KAISER EFFECT AND ELECTROMAGNETIC EMISSION IN THE DEFORMATION OF ROCK SAMPLE
AE KAISER EFFECT AND ELECTROMAGNETIC EMISSION IN THE DEFORMATION OF ROCK SAMPLE
复制标题
DOI：
--
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Y. Mori;Y. Obata;J. Pavelka;J. Sikula;T. Lokajicek
中科院分区：
文献类型：
--
作者：
Y. Mori;Y. Obata;J. Pavelka;J. Sikula;T. Lokajicek
对花岗岩试件进行了反复加载试验，并同时进行了声发射和电磁发射的测试。在加载试验中，以一定的增量逐步增加最大压缩载荷，直到试样发生破裂，以检查所测试的岩石试样的Kaiser效应。结果表明，声发射出现在应力水平低于先前的最大应力，因此凯塞效应不能清楚地识别在岩石测试。然而，电磁辐射只出现在加载应力接近和超过最大先前的应力。本文通过实验研究了岩石样品的声发射和电磁发射活动特征，讨论了岩石样品中凯塞效应的物理意义，为估计岩石样品所经受的当前应力水平提供了可能性。
Repeated loading test and simultaneous measurement of AE and electromagnetic emission were conducted on the granite samples. In the loading test, the maximum compressive load was increased step-by-step at a certain increment until the sample rupture took place to examine the Kaiser effect of the rock sample tested. The results showed that acoustic emission appeared at stress levels below the maximum previous stress, and thus the Kaiser Effect could not be clearly recognized in the rock tested. However, the electromagnetic emission appeared only when the loading stress was approached and exceeded the maximum previous stress. In the present paper, characteristics of the AE and electromagnetic emission activities are experimentally investigated and the physical meaning of the Kaiser Effect in rock sample is discussed, showing a possibility for estimating the current stress level to which rock samples have been subjected.