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首页> 外文会议>Sino-Japan Geotechnical Symposium November; 20071104-07; Chongqing(CN) >ACOUSTIC RESPONSES ANALYSIS ON ROCK CORE UNLOADING-DISTURBANCE BASED ON WAVELET TRANSFORMATION
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ACOUSTIC RESPONSES ANALYSIS ON ROCK CORE UNLOADING-DISTURBANCE BASED ON WAVELET TRANSFORMATION

机译：基于小波变换的岩心卸荷扰动声响应分析

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摘要

According to the present national standard,the square of the ratio of longitudinal wave(P-wave)velocity of rock mass to that of rock block is defined as intactness index of rock mass. As we know,usually the P-wave velocity of in-situ rock mass is believed to be lower than that of relevant rock block. The more broken the rock mass is, the lower its P-wave velocity is than that of rock block. Acoustic logging and wave velocity measurement of rock cores are applied in bedrock of Nanjing subway engineering. It is surprised to find that most wave velocities of rock mass are higher than that of rock cores and the cause of the results is unloading-disturbance influence on rock cores. In order to analyze the acoustic responses of rock core unloading-disturbance more availably, wavelet transformation method is applied to decompose the rock core acoustic signals into wavelet components belonging to various frequency channels in this paper,and weighted spectrum parameters are given after time-frequency analyzing these channel signals. There is a good relationship between the data processing of rock core acoustic signals and rock core sensitivity degree of unloading-disturbance. It is indicated that it's superior to adopt wavelet transformation method for rock cores unloading-disturbance.
机译：根据现行国家标准，将岩体纵向波（P波）速度与岩体纵向波速之比的平方定义为岩体的完整性指标。众所周知，通常认为原位岩体的P波速度低于相关岩体的P波速度。岩石块破碎得越多，其P波速度就比岩石块低。南京地铁工程基岩采用岩心的声波测井和波速测量。令人惊讶地发现，大多数岩体的波速都高于岩心的波速，其结果的原因是卸荷扰动对岩心的影响。为了更有效地分析岩心卸荷扰动的声响应，本文采用小波变换方法将岩心声信号分解为属于各个频率信道的小波分量，并给出了时频后的加权频谱参数。分析这些通道信号。岩心声信号的数据处理与岩心卸荷扰动灵敏度之间存在良好的关系。结果表明，采用小波变换方法对岩心卸荷扰动具有一定的优越性。

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