岩土力学Issue(5)：1306-1312,7.
典型岩石破裂产生次声波试验研究
Experimental study of infrasound wave generated by typical rock fracture
摘要
Abstract
Experiments on characteristics of infrasonic wave generated by full-regime rock failure under uniaxial loading are carried out with a stiffness material test machine, and the stiffness materials involve granite, limestone, red sandstone, sandstone, phyllite, mudstone. In this study, an advanced digital infrasound emission detecting system to study the characteristics of the infrasonic signals is independently developed. The collected infrasonic signals are processed and analyzed through the wavelet-based denoising method, short-time Fourier transform time-frequency analysis and accumulative ring-down count (ARDC). The results show that: ① The infrasonic wave emission phenomena can apparently appear during the process of uniaxial loading of rocks before rocks fracture. ②The characteristic frequency of prominent infrasonic wave generated by rocks’ fracture typically range 2.0-6.0 Hz. ③ The ARDC of hard rocks, e.g. granite and limestone, are much more than those of soft rocks, e.g. mudstone, in the case of complete structure. Compared with other acoustic signals, infrasound is low-attenuate, cannot be absorbed easily by water and air, and can propagate avoiding huge obstacles due to its long wavelength. Combined with other methods, the further study of the characteristics of infrasonic wave generated by rocks’ microfracture can provide a significant innovate approach and techniques for rock stability monitoring.关键词
次声波/岩石破裂/时-频分析/特征频率/岩石(体)稳定性Key words
infrasonic wave/rock failure/time-frequency analysis/characteristic frequency/rock stability分类
建筑与水利引用本文复制引用
朱星,许强,汤明高,付小敏,周建斌..典型岩石破裂产生次声波试验研究[J].岩土力学,2013,(5):1306-1312,7.基金项目
国家重点基础研究发展计划（973计划）项目(No.2008CB425801)；教育部长江学者和创新研究团队计划项目(No. IRT0812)。 （No.2008CB425801）
