河南科技大学学报（自然科学版）2024，Vol.45Issue(1)：79-87,97,10.DOI:10.15926/j.cnki.issn1672-6871.2024.01.010
中间主应力对花岗岩双轴压缩破坏过程的声发射演化特征影响
Influence of Intermediate Principal Stress on Acoustic Emission Evolutionary Characteristics of Granite Biaxial Compression Failure Process
摘要
Abstract
In order to investigate the influence of intermediate principal stress on the acoustic emission evolution ary characteristics of granite biaxial compression failure process,a comprehensive analysis of the acoustic emission signals of granite biaxial compression failure process under different intermediate principal stresses was conducted from multiple perspectives in time and frequency domains.The test results show that the intermediate principal stress has a significant effect on the acoustic emission precursors of granite biaxial compression failure.With the increase of the intermediate principal stress,the stress level decreases when the cumulative acoustic emission ringing count reaches the continuous rapid growth stage,the continuous decline rate of the B-value decreases,and the stress level decreases when the proportion of the dominant frequency band(125～250 kHz)changes significantly.However,the proportion of low-frequency and high-amplitude signals increases.A variety of acoustic emission precursory characteristics of biaxial compression failure of granite were obtained.On the eve of rock instability and failure,the cumulative acoustic emission ringing count presents a continuous and sudden increase and a significant continuous decline in B-value,low-frequency and high-amplitude signals appear,and the proportion of dominant frequency band(125～250 kHz)shows an increasing trend.关键词
岩石/双轴压缩/中间主应力/声发射/演化特征Key words
rock/biaxial compression/intermediate principal stress/acoustic emission/evolutionary characteristics分类
计算机与自动化引用本文复制引用
刘鑫锦,苏国韶,李小玉,张康,冯木生..中间主应力对花岗岩双轴压缩破坏过程的声发射演化特征影响[J].河南科技大学学报（自然科学版）,2024,45(1):79-87,97,10.基金项目
国家自然科学基金项目(52169021) （52169021）
山东省博士后创新项目(202103033) （202103033）
