东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2007, Vol. 28 ›› Issue (4): 576-579.DOI: -

• 论著 • 上一篇    下一篇

不同应力路径对岩石声发射Kaiser效应的影响

李元辉;袁瑞甫;赵兴东;   

  1. 东北大学资源与土木工程学院;东北大学资源与土木工程学院;东北大学资源与土木工程学院 辽宁沈阳110004;辽宁沈阳110004;河南理工大学能源科学与工程学院;河南焦作454000;辽宁沈阳110004
  • 收稿日期:2013-06-24 修回日期:2013-06-24 出版日期:2007-04-15 发布日期:2013-06-24
  • 通讯作者: Li, Y.-H.
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(5047401750474018);;

Effect of different stress paths on Kaiser effect of rock acoustic emission

Li, Yuan-Hui (1); Yuan, Rui-Fu (1); Zhao, Xing-Dong (1)   

  1. (1) School of Resources and Civil Engineering, Northeastern University, Shenyang 110004, China; (2) School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
  • Received:2013-06-24 Revised:2013-06-24 Online:2007-04-15 Published:2013-06-24
  • Contact: Li, Y.-H.
  • About author:-
  • Supported by:
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摘要： 为了解在循环加载过程中使用不同应力路径岩石声发射Kaiser效应的特征,采用岩石破裂过程分析软件(RFPA2D)对三种不同应力路径下岩石试样的声发射特征进行了数值计算.在循环加载中采用不同的应力路径对试样加载,在二次加载过程中仍能观测到清晰的Kaiser效应,但是KF值却与先前的最大应力值有较大差别.研究结果表明,岩石Kaiser记忆的真实内容不是先前所受的最大应力,而是岩石内部的损伤程度.使用从原岩中取样,在实验室做单轴压缩声发射实验观测KF值的方法测得的应力值与真实的原岩应力有较大的差别.这一结论对于进一步认识Kaiser效应的本质和用Kaiser效应准确的测定原岩应力有重要的作用.

关键词: 声发射, Kaiser效应, 应力路径, 数值实验, 原岩应力

Abstract: To understand the characteristic of Kaiser effect along different stress paths during cyclic load acting on rock, a numerical computation was conducted using the rock failure process analysis software RFPA2D for the characteristics of acoustic emission (AE) along three different stress paths in rock specimens. The results showed that the Kaiser effect is still clearly observed in the subsequent cycle when the specimens are under cyclic load though a big difference between KF values (the stress value at Kaiser effect point) and previous max stress value is found. It was revealed that what was actually recorded in the Kaiser effect memory is the damage level within rock other than the max stress acting previously on the specimens. So, if sampling from parent rock, the stress value measured from observing KF value by uniaxial compression AE testing in laboratory is different greatly from that in parent rock. The conclusion is significant to understanding the essence of Kaiser effect and how to use it to determine the in-situ stress.

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