深埋隧洞即时型岩爆孕育过程的频谱演化特征
发布时间：2018-08-31 10:25
【摘要】：岩爆孕育过程中所记录的微震事件波形本身就包含着丰富的前兆信息。基于深埋隧洞微震波的衰减特征,修正了最大有效振幅,将相对有效振幅和最大有效频率作为频谱分析参数。TBM和钻爆法不同开挖方式下诱发的即时型岩爆孕育过程的频谱演化特征基本一致,有如下特征:(1)无岩爆发生时,每日最大释放能量微震事件频谱对应的相对有效振幅的量级为10-6m/s及以下,而最大有效频率则多大于300 Hz;(2)中等岩爆发生前,相对有效振幅的量级维持在10-5m/s,最大有效频率则介于200~300 Hz;(3)强烈岩爆发生前,微震事件对应相对有效振幅的量级增长并保持在10-4m/s,最大有效频率则基本在200 Hz以下;(4)对于一个完整的即时型岩爆孕育过程,当岩爆发生时,相对有效振幅增至最大,同时最大有效频率降至最低。微震信号的频谱演化特征可为即时型岩爆发生时间及等级的预警提供参考和依据。
[Abstract]:The microseismic event waveform recorded in the process of rock-burst preparation contains abundant precursor information. Based on the attenuation characteristics of microseismic wave in deep buried tunnel, the maximum effective amplitude is corrected. Using the relative effective amplitude and the maximum effective frequency as the spectral analysis parameters. TBM and drilling and blasting methods, the characteristics of spectrum evolution of the instant rockburst inoculation process induced by drilling and blasting method are basically consistent. The characteristics are as follows: (1) when there is no rockburst, The order of magnitude of the relative effective amplitude corresponding to the spectrum of daily maximum release energy microseismic events is 10-6m/s and below, and the maximum effective frequency is more than 300 Hz; (2) before the intermediate rock burst. The magnitude of the relative effective amplitude is maintained at 10-5 m / s, and the maximum effective frequency is between 200 and 300 Hz; (3) strong rock burst. The microseismic events correspond to the order of magnitude of the relative effective amplitude and remain at 10-4 m / s, and the maximum effective frequency is almost less than 200 Hz. (4) for a complete instant rockburst incubation process, when the rockburst occurs, the relative effective amplitude increases to the maximum. At the same time, the maximum effective frequency is reduced to the lowest. The spectrum evolution characteristics of microseismic signals can provide reference and basis for early warning of the occurrence time and grade of instant rockburst.
【作者单位】： 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家973项目资助(No.2010CB732006)
【分类号】：TU45;P315.9
，
本文编号：2214706
[Abstract]:The microseismic event waveform recorded in the process of rock-burst preparation contains abundant precursor information. Based on the attenuation characteristics of microseismic wave in deep buried tunnel, the maximum effective amplitude is corrected. Using the relative effective amplitude and the maximum effective frequency as the spectral analysis parameters. TBM and drilling and blasting methods, the characteristics of spectrum evolution of the instant rockburst inoculation process induced by drilling and blasting method are basically consistent. The characteristics are as follows: (1) when there is no rockburst, The order of magnitude of the relative effective amplitude corresponding to the spectrum of daily maximum release energy microseismic events is 10-6m/s and below, and the maximum effective frequency is more than 300 Hz; (2) before the intermediate rock burst. The magnitude of the relative effective amplitude is maintained at 10-5 m / s, and the maximum effective frequency is between 200 and 300 Hz; (3) strong rock burst. The microseismic events correspond to the order of magnitude of the relative effective amplitude and remain at 10-4 m / s, and the maximum effective frequency is almost less than 200 Hz. (4) for a complete instant rockburst incubation process, when the rockburst occurs, the relative effective amplitude increases to the maximum. At the same time, the maximum effective frequency is reduced to the lowest. The spectrum evolution characteristics of microseismic signals can provide reference and basis for early warning of the occurrence time and grade of instant rockburst.
【作者单位】： 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家973项目资助(No.2010CB732006)
【分类号】：TU45;P315.9
，
本文编号：2214706
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