岩石声发射测量地应力信号处理技术研究

针对目前岩石声发射信号处理存在的问题，在对岩石声发射技术和信号处理技术归纳的基础上，对比了目前各种信号处理的方法，指出了小波分析理论满足岩石声发射信号处理的要求；接着，利用频谱分析等找出岩石声发射信号的频率范围；进而，通过分析研究得到合适的小波基、阂值形式；最后，对信号进行分解、去噪、重构和压缩．经理论分析和实例结果说明，借助Matlab软件，应用小波分析和小波包分析理论，可有效进行岩石声发射信号分析和处理．

Study on the Signal Processing for Rock Initial Stress Measurment by Acoustic Emission

Based on the sum-up of rock initial stress measurment by acoustic emission （AE） and signal processing, all signal processing methods are analyzed, and wavelet theory is pointed out as the right method to the signal processing of rock AEo With the study on frequency spectrum analysis of rock AE, FFT is applied to the signal of rock AE, then according to the results of analysis, the frequency scope of rock AE is gained. This article studies and discusses the mother wavelet suitable for signal processing of rock AE, and finds out the right mother wavelets. The separation of signal and noise about signal processing of rock AE are studied, In terms of results of study, the right threshold value for signal procession by signal validation of rock AE is found. Experiment about rock AE on point-load instrument is carried on exploringly, which uses wavelet analysis to process the signals of rock acoustic emission. With the muhiresolution analysis and Mallat＇s Pyramid Algorithm, signal gained by test is decomposed, removed,compressed, and reconstructed. The theoretical analysis and results of illustration analysis explain that through the instrumentality of the software of MATLAB, WT and WPT, the signal analysis and processing of rock acoustic emission can be carried on.