岩石声发射Kaiser点信号的小波分析及其应用初步研究  

WAVELET ANALYSIS OF KAISER SIGNAL OF ROCK ACOUSTIC EMISSION AND ITS APPLICATION

作　　者：赵奎[1] 邓飞[1] 金解放[1] 何国强[1] 刘洪兴 

机构地区：[1]江西理工大学环境与建筑工程学院,江西赣州341000

出　　处：《岩石力学与工程学报》2006年第z2期3854-3858,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50464002);江西省教育厅科技计划项目(2005-151)

摘　　要：针对目前岩石声发射采用参数法确定Kaiser点所存在的问题,提出基于波形分析的确定Kaiser点的小波分析研究方法。利用RMT-150C岩石力学试验系统与WAE2002型全波形多通道声发射检测仪,进行单轴加载岩石破坏全过程声发射试验。首先,对砂岩声发射Kaiser点信号进行了频谱分析,确定了Kaiser点信号的频率范围,提出基于小波变换的Kaiser点信号的信噪分离方法;其次,进行现场套孔砂岩岩芯的单轴加载声发射试验,结合Kaiser效应原理和现场实测结果确定了Kaiser点,提取相应的波形信号,并进行小波降噪处理。研究结果表明,小波分析是处理岩石声发射Kaiser点信号的一种有效的方法,从而为通过波形分析方法确定岩石声发射Kaiser点及声发射机制研究奠定了一定的试验基础。Aimed at technical difficulties of parameter analysis method to determine Kaiser point of rock acoustic emission(AE),a new waveform analysis method based on wavelet analysis is put forward.Acoustic emission tests of sandstone specimens under uniaxial compression are carried out using the rock mechanics testi,.e.RMT–150C equipment and WAE2002 acoustic emission instrument.First,AE signal frequency distribution regularity is obtained by means of spectrum analysis based on the testing results,and the signal noise reduction method for AE at Kaiser point is presented.Then,Kaiser point is determined and corresponding waveform signal is obtained according to Kaiser effect and in-situ stress results.Results show that wavelet analysis is an effective way in noise reduction and signal processing of AE at Kaiser point.So the results can be served as the experimental foundation of research on the new waveform analysis method and AE mechanism.

关 键 词：岩石力学 地应力 声发射 KAISER效应 信号处理 小波分析 

分 类 号：TU457[建筑科学—岩土工程]