• 首页 | 期刊简介 | 编委会 | 投稿须知 | 下载专区 | 联系我们 | English
岩石破坏过程中声发射撞击参数的变化规律
The Change Law of Acoustic Emission Hit Parameters during the Fracture Process of Rock
投稿时间: 2017-04-18  最后修改时间: 2017-08-29
DOI:
中文关键词:  蚀变花岗片麻岩  声发射撞击参数  岩石破裂  裂纹演化阶段
英文关键词:altered granite gneiss  acoustic emission hit parameters  rock failure  crack evolution stages
基金项目:国家重点研发计划项目
作者单位E-mail
杨振琦 东北大学  
张鹏海 东北大学 zhangpenghai2005@163.com 
王述红 东北大学  
门晓溪 辽宁科技大学  
摘要点击次数: 75
全文下载次数: 
中文摘要:
      本文对取自石人沟铁矿的蚀变花岗片麻岩进行了单轴压缩条件下的声发射试验,对声发射撞击率、持续时间、能量、幅值、b值及撞击主频的变化过程进行了分析,统计了各参数异常变化出现的时间顺序及对应裂纹演化阶段。研究发现:岩石破坏前,主频、能量、撞击率、持续时间、幅值的明显升高以及b值的明显降低或剧烈波动现象可作为应力水平升高的标志。这些撞击参数的变化现象间存在较为稳定的时间顺序及并且与裂纹演化阶段存在一定对应关系,可帮助识别岩石所处的裂纹演化阶段。然而,局部裂纹剧烈演化阶段会导致撞击参数出现与裂纹加速扩展阶段相似的变化现象,影响了判断岩石所处裂纹演化阶段的准确性。由于裂纹演化阶段与稳定性密切相关,所以以上研究结果可为利用声发射方法评价岩石的稳定性提供试验依据。
英文摘要:
      In this paper, the AE tests were conducted on altered granite gneiss under the condition of uniaxial compression. By analyzing the changes of AE hit parameters, including AE hit rate, duration, energy, amplitude, b value and dominant frequency, the time order of abnormal change phenomenon of hit parameters and the relationship between the time order and crack evolution stages were determined. The results showed that the significant increase of AE hit rate, duration, energy, amplitude and dominant frequency, and the significant decrease and severe fluctuation of b value could be used as the signs of increased stress levels. There were a general time order of the abnormal changes in hit parameters and a corresponding relation between the general time order and crack evolution stages. Based on the corresponding relation, the crack evolution stages could be identified by AE hit parameters. However, the changes of hit parameters were similar in the stage of intense evolutionary of localized cracks and the stage of accelerate extension of cracks, reducing the identification accuracy of the crack evolution stages. Due to the close relation between the stability and the crack evolution stages, the research results can provide a test basis for rock stability evaluation.
查看全文  查看/发表评论  下载PDF阅读器
关闭

版权所有:《实验力学》编辑部
您是本站第 1668941 位访问者,今日一共访问665次,当前在线人数: 10
技术支持:本系统由北京勤云科技发展有限公司设计