摘要
为探究岩石破坏时声发射峰值频率分布及变化情况,通过单轴压缩条件下冰、煤和花岗片麻岩试样的声发射实验,利用快速傅里叶变换确定声发射波形的峰频,分析其分布特征及在材料破坏过程中的变化。结果表明:声发射波形的峰值频率主要以条带状分布为特征,其不随应力、岩石内部不断增加的微破裂以及宏观破裂面的出现而发生变化或波动;随着物质构成种类的增加,峰值频率形成的条带数量也不断增加;峰值频率分布特征主要由材料自身决定,不同物质破裂时可能会诱发峰值频率不同的声发射波形,而不同物质破裂数量随时间的变化是引起峰值频率曲线变化过程发生改变的主要原因。
This paper is an attempt to investigate the law underlying the distribution and variation of the acoustic emission peak frequency.The study involves performing the acoustic emission experiments on ice,coal and altered granite gneiss under the uniaxial compression condition;determining the acoustic emission peak frequency by fast Fourier transform;and analyzing the distribution characteristics and its variation during the material failure process.The results show that the distribution of peak frequencies of acoustic emission is mainly characterized by banding distribution,and is not influenced by stress,the increasing number of micorcracks,and the occurrence of macrocracks;along with an increase in the number of material composition comes an increase in the number of peak frequency bands.This indicates that the distribution characteristics of peak frequencies are mainly controlled by the material itself;different material composition might induce different peak frequency;and the changes in the number of cracks in different material composition are responsible mainly for the change of peak frequency curve.
作者
解治宇
孙健
姚强
Xie Zhiyu;Sun Jian;Yao Qiang(Angang Group Mining Co.Ltd.,Anshan 114000,China)
出处
《黑龙江科技大学学报》
CAS
2019年第6期674-677,713,共5页
Journal of Heilongjiang University of Science And Technology
基金
国家重点研发计划项目(2016YFC0801600)
关键词
花岗片麻岩
冰
煤
声发射
峰值频率
granite gneiss
ice
coal
acoustic emission
dominant frequency
