中文摘要：

利用双轴伺服试验机开展花岗岩巷道岩爆模拟试验,采用声发射系统获取岩爆全过程的波形信号。基于频谱分析理论,研究岩爆孕育、发生全过程的声发射信号主频特性。研究结果表明：双轴加载条件下花岗岩巷道岩爆声发射主频分布区间为0.4～110 kHz,其中99%以上的主频值集中在35～65 kHz。声发射信号主频的分布随岩爆演化可分为3个阶段：（1）岩爆孕育前期,大部分主频值集中在35～65 kHz和15～25 kHz区间,且有一定数量接近0.4 kHz的低频值出现,极少出现接近110 kHz的高频值;（2）岩爆孕育中期,主频值集中在35～65 kHz区间,接近0.4 kHz的低频值基本消失,少量接近110 kHz的高频值开始出现;（3）岩爆发生阶段,35～65 kHz区间内的主频数量骤减,接近0.4 kHz的低频值极少出现,接近110 kHz的高频值密集出现。研究结果为优选声发射监测频段提供了方法和依据,且对巷道岩爆的监测预警工作具有重要理论意义。

英文摘要：

A biaxial servo testing machine is used to simulate rockburst of a granite tunnel, and the acoustic emission （AE） system is applied to acquire the waveform signal. The dominant-frequency characteristics of AE signals from initiation to occurrence of rockburst are analyzed using the spectrum analysis theory. The results show that the dominant frequency interval of AE signal is from 0.4 to 110 kHz, and more than 99% of the dominant-frequency concentration is in the range of 35-65 kHz. The distribution of the dominant-frequency of the AE signal can be divided into three stages with the evolution of rockburst. In the early stage of rockburst initiation, the dominant frequency is in the range of 35-65 kHz and 15-25 kHz, a few of low frequency AE signal close to 0.4 kHz occurs, and high frequency around 110 kHz seldom appear. In the middle period of rockburst initiation, the low frequency around 0.4 kHz nearly disappears, but the high frequency around 110 kHz begins to appear. In the final stage of rockburst occurrence, the number of dominant-frequency in the range of 35-65 kHz plummets, the low frequency approximate to 0.4 kHz almost disappears, but the high frequency close to 110 kHz appears intensively. The study provides the fundamental understanding of optimizing the frequency band of AE monitoring, which has important theoretical significance with respect to monitoring and early warning of tunnel rockburst.