采矿与安全工程学报 ›› 2016, Vol. 33 ›› Issue (3): 521-527.

• 论文 • 上一篇    下一篇

层理倾角对黑云变粒岩声发射特征的影响

  

  1. 1.东北大学中荷学院,辽宁 沈阳 110819;2.东北大学资源与土木工程学院,辽宁 沈阳 110819; 3.北京科技大学土木与环境工程学院,北京 100083
  • 收稿日期:2015-11-22 出版日期:2016-05-15 发布日期:2016-06-03
  • 作者简介:杨振琦(1997—),男,辽宁省沈阳市人,从事岩石声发射监测数据统计与分析方面的研究。
  • 基金资助:

    国家重点基础研究发展计划(973)项目(2013CB227902)

The influence of bedding angle on acoustic emission characteristics in biotite granulite

  • Received:2015-11-22 Online:2016-05-15 Published:2016-06-03

摘要: 为研究层理倾角对岩石声发射特征的影响,将取自河北滦县司家营铁矿露天坑的层状黑云变粒岩分别加工成层理倾角为 0°,45°,90°的 3 种试件,并进行单轴压缩条件下的声发射试验。通过对不同层理倾角岩石声发射事件时空分布、盒维数以及能量释放特征的分析发现:层理倾角为 0°和 90°的岩石均发生劈裂破坏且具有相似的声发射事件时空分布规律;层理倾角为 45°的岩石以剪切破坏为主,声发射事件时空分布规律与破裂模式有关;随着层理倾角的增大,临近破坏时盒维数降低现象出现的可能性会降低,并且声发射能量释放方式由匀速释放向阶跃式释放转变。研究成果对于利用声发射手段深入揭示层状岩石破裂机制具有一定的学术价值。

关键词: 黑云变粒岩, 层理倾角, 声发射, 盒维数, 能量

Abstract: In order to study the influence of bedding angles on acoustic emission (AE) characteristics, the AE experiments on the biotite granulite specimens with the bedding angles of 0°, 45° and 90° were conducted. The biotite granulite specimens were taken from Sijiaying open pit mine in Luan County, Hebei province, China. Under the uniaxial compression condition, the spatial and temporal distribution of AE events, the change of the box dimension and the characteristics of the energy release were studied. The research results have shown that:1) The evolution laws of AE events in the specimens with the bedding angles of 0° and 90° were similar, while the evolution laws of AE events in the specimens with the bedding angle of 45° were significantly influenced by the fracture modes; 2) With the increasing of the bedding angles, the number of specimens in which box dimension reduction occurred before the failure was decreasing, and AE energy was prone to releasing in a sudden way. The findings have academic value to the research on revelation of mechanism of disintegration with acoustic emission.

Key words: biotite granulite, bedding angle, acoustic emission, box dimension, energy