【摘要】：巖爆孕育過程中所記錄的微震事件波形本身就包含著豐富的前兆信息�；谏盥袼矶次⒄鸩ǖ乃p特征,修正了最大有效振幅,將相對有效振幅和最大有效頻率作為頻譜分析參數(shù)。TBM和鉆爆法不同開挖方式下誘發(fā)的即時型巖爆孕育過程的頻譜演化特征基本一致,有如下特征:(1)無巖爆發(fā)生時,每日最大釋放能量微震事件頻譜對應(yīng)的相對有效振幅的量級為10-6m/s及以下,而最大有效頻率則多大于300 Hz;(2)中等巖爆發(fā)生前,相對有效振幅的量級維持在10-5m/s,最大有效頻率則介于200~300 Hz;(3)強烈?guī)r爆發(fā)生前,微震事件對應(yīng)相對有效振幅的量級增長并保持在10-4m/s,最大有效頻率則基本在200 Hz以下;(4)對于一個完整的即時型巖爆孕育過程,當巖爆發(fā)生時,相對有效振幅增至最大,同時最大有效頻率降至最低。微震信號的頻譜演化特征可為即時型巖爆發(fā)生時間及等級的預(yù)警提供參考和依據(jù)。
[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.
【作者單位】： 中國科學院武漢巖土力學研究所巖土力學與工程國家重點實驗室;
【基金】：國家973項目資助(No.2010CB732006)
【分類號】：TU45;P315.9
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本文編號：2214706