采矿与安全工程学报Issue(1)：179-184,6.DOI:10.13545/j.cnki.jmse.2016.01.028
基于HHT的粉砂岩破裂声发射信号频率特性研究
Frequency characteristics of acoustic emission signal during rupture process of siltstone based on HHT
摘要
Abstract
By the uniaxial compression tests of siltstone samples, frequency characteristics of acoustic emission (AE) signals in the failure process of siltstone rock were investigated based on HHT analysis. The results show that HHT is a kind of signal time-frequency analysis method based on principal com-ponent analysis, which can determine the major and minor components of the signals, and precisely de-scribe the time-frequency characteristics of the signal with instantaneous frequency. The time-frequency distribution of AE signal of siltstone can be divided into three stages during rupture process:initial zone, wave zone, and quiet zone. Main frequencies of AE signals during rupture process of siltstone samples are associated with stress levels, that is, main frequency decreases with the increase of stress level be-fore siltstone failure. From the stable extension of crack to unstable extension, until the rock failure, high energy AE signals transfer from high frequency to low frequency, and its duration increases. Ap-propriate monitoring bands of AE signals during siltstone rupture process is 20-120 kHz.关键词
粉砂岩/单轴压缩/声发射/频率/HHTKey words
siltstone/uniaxial compression/acoustic emission/frequency/HHT分类
矿业与冶金引用本文复制引用
张艳博,梁鹏,孙林,刘祥鑫..基于HHT的粉砂岩破裂声发射信号频率特性研究[J].采矿与安全工程学报,2016,(1):179-184,6.基金项目
国家自然科学基金项目(51174071，51374088)；河北省自然科学基金项目(E2012209047) （51174071，51374088）
