地震地质 ›› 1991, Vol. 13 ›› Issue (2): 97-114.

• 科研简报 •    下一篇

三轴压缩下粗晶花岗闪长岩声发射三维分布及其分形特征

雷兴林1, 马瑾1, 楠濑勤一郎2, 西泽修2, 佐藤隆司2   

  1. 1. 国家地震局地质研究所, 北京 100029;
    2. 日本地质调查所
  • 收稿日期:1990-03-31 出版日期:1991-06-05 发布日期:2009-11-25

SPATIAL DISTRIBUTION AND FRACTAL STRUCTURE OF AE FOCUSES OF INADA GRANITE UNDER TRIAXIAL COMPRESSION

Lei Xing-lin1, Ma Jin1, Kusunose K.2, Nishizawa O.2, Satoh T.2   

  1. 1. Institute of Geology, State Seismological Bureau, Beijing 100029;
    2. Geological Survey of Japan, Tsukuba, 305 Japan
  • Received:1990-03-31 Online:1991-06-05 Published:2009-11-25

摘要: 本文介绍稻田花岗岩(Inada granite,即粗晶花岗闪长岩)在三轴压缩变形条件下,声发射活动空间分布特征的实验研究结果。研究表明,声发射空间分布具有明显的自相似结构,其分维维数为2.1—2.3,明显低于大岛花岗岩(Oshima granite,即细晶花岗闪长岩)在相似变形条件下的结果,后者为2.7左右。粗晶花岗岩声发射分布还具多分形特征,其拐点为岩石平均颗粒粒度Rc(=5mm),在大于Rc的尺度内的分维Dl和小于Rc尺度的分维Ds各自具有不同的动态变化关系。作者指出,Ds,Dl的大小表示各自尺度内应力场非均匀变化。

关键词: 声发射, 微破裂, 三维定位, 分维

Abstract: An experimental study on the spatial distribution of the focuses of acoustic emissions of Inada granite (coarse grained granodiorite) under triaxial compression is reported in this paper. It is pointed out that AE locations is fractal with a dimension of 2.2 in average,lower than the result of Oshima granite (fine grained granodiorite),which is 2.7,under similar deformation condition. For Inada granite a band-limited fractal had been observed. Fractal dimension changed around grain size of the rock (RC=5mm) Fractal dimension Ds and Dl (below and above the grain size,respectively) had different developing tendency. Ds and Dl can be considered as indicators of the inhomogeneity of stress field in corresponding scale.

Key words: Acoustic emission, Microfracturing, Three-dimensional focal location, Fractal