Abstract
The sandstone test of uniaxial compression acoustic emission (AE) test has been studied, the HHT analysis is applied to AE signal processing, and through the analysis of AE signal to reveal the process of rock fracture. The results show that HHT is a method that based on principal component analysis of time-frequency analysis. The method of HHT can very convenient to deal the singular signal; it can be determine the main composition of singular signal. The instantaneous frequency can be used to describe precisely the time-frequency characteristics of singular signal. The method has a very important significance to reveal the frequency characteristics of AE signal. The EMD signal is decomposed into 8 IMF components in the failure process of rock sound. The component of IMF1 ~ IMF4 is the main component, and the IMF5 ~ IMF8 for low frequency noise signal. Through the EMD of AE signal frequency, the rock fracture has been decomposition into three stages: the initial zone, wave zone, quiet zone. This shows that in the analysis of rupture must eliminate noise interference signal characteristics of AE.
Highlights
As we known, there is a process from quantitative change to qualitative change in the occurrence of any damage
With the development of acoustic emission (AE) technology, and its application in rock mechanics, many scholars use the AE testing technology for rock failure process carried on the thorough analysis and research, including: Mansurov and Rudajev predict rock damage types by the AE measurement [2,3]
Step 2: the original signal of AE is decomposed into a series of different characteristic time scales of intrinsic mode function (IMF) by EMD decomposition of HHT and formula (1) and (2)
Summary
There is a process from quantitative change to qualitative change in the occurrence of any damage. Based on the research of the AE signal, the internal condition change and the inversion of the rock failure mechanism can be concluded [1]. Ganne studied the peak before the brittle failure of rock by using the AE technology, 4 process of AE accumulated energy could be taken [5]. Moriya have taken an study on broken evolution process in Bain salt mine in Germany, and found that the distribution of AE signal changes over principal stress rotation direction and depth [8]. The main research is from parameter analysis, just only from qualitative to description the rock failure process. This is very limited to reflect the rock failure nature from the angle of AE
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