本文選題：花崗巖　切入點(diǎn)：巷道巖爆　出處：《巖土力學(xué)》2017年05期 　論文類(lèi)型：期刊論文

【摘要】：利用雙軸伺服試驗(yàn)機(jī)開(kāi)展花崗巖巷道巖爆模擬試驗(yàn),采用聲發(fā)射系統(tǒng)獲取巖爆全過(guò)程的波形信號(hào)�；陬l譜分析理論,研究巖爆孕育、發(fā)生全過(guò)程的聲發(fā)射信號(hào)主頻特性。研究結(jié)果表明:雙軸加載條件下花崗巖巷道巖爆聲發(fā)射主頻分布區(qū)間為0.4~110 kHz,其中99%以上的主頻值集中在35~65 kHz。聲發(fā)射信號(hào)主頻的分布隨巖爆演化可分為3個(gè)階段:(1)巖爆孕育前期,大部分主頻值集中在35~65 kHz和15~25 kHz區(qū)間,且有一定數(shù)量接近0.4 kHz的低頻值出現(xiàn),極少出現(xiàn)接近110 kHz的高頻值;(2)巖爆孕育中期,主頻值集中在35~65 kHz區(qū)間,接近0.4 kHz的低頻值基本消失,少量接近110 kHz的高頻值開(kāi)始出現(xiàn);(3)巖爆發(fā)生階段,35~65 kHz區(qū)間內(nèi)的主頻數(shù)量驟減,接近0.4 kHz的低頻值極少出現(xiàn),接近110 kHz的高頻值密集出現(xiàn)。研究結(jié)果為優(yōu)選聲發(fā)射監(jiān)測(cè)頻段提供了方法和依據(jù),且對(duì)巷道巖爆的監(jiān)測(cè)預(yù)警工作具有重要理論意義。
[Abstract]:The simulation test of rock burst in granite roadway was carried out by using a biaxial servo tester, and the waveform signal of the whole process of rock burst was obtained by acoustic emission system. Based on the theory of spectrum analysis, the inoculation of rock burst was studied. The main frequency distribution range of rock burst acoustic emission in granite roadway under biaxial loading is 0.4 ~ 110 kHz, in which over 99% of the main frequency values are concentrated in 35 ~ 65 kHz. The main frequency of acoustic emission signal is 35 ~ 65 kHz. The distribution can be divided into three stages with the evolution of rockburst. Most of the main frequency values are concentrated in the range of 35 ~ 65 kHz and 15 ~ 25 kHz, and there are a certain number of low frequency values close to 0.4 kHz, and very few high frequency values close to 110 kHz are found in the middle stage of rock burst, and the main frequency values are concentrated in the range of 35 ~ 65 kHz. The low frequency value close to 0. 4 kHz disappeared, and a small number of high frequency values close to 110 kHz began to appear. (3) the number of main frequencies in the range of 35 ~ 65 kHz in the rock burst stage decreased sharply, and the low frequency values close to 0. 4 kHz rarely appeared. The high frequency values close to 110 kHz appear intensively. The results provide a method and basis for the optimal selection of acoustic emission monitoring frequency band, and have important theoretical significance for the monitoring and early warning of tunnel rock burst.
【作者單位】： 華北理工大學(xué)礦業(yè)工程學(xué)院;華北理工大學(xué)河北省礦業(yè)開(kāi)發(fā)與安全技術(shù)重點(diǎn)試驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(No.51374088,No.51574102) 河北省自然科學(xué)基金(No.E2017209241)~~
【分類(lèi)號(hào)】：TU45

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