本文選題：巖石力學(xué) + 爆破損傷��； 參考：《巖土力學(xué)》2017年09期

【摘要】：為深入揭示巖體爆破累積損傷效應(yīng)及其與巖體聲學(xué)特性之間的內(nèi)在聯(lián)系,在某地下工程圍巖中進(jìn)行了10次小藥量爆破,并開展了巖體損傷現(xiàn)場(chǎng)聲波測(cè)試�；诳焖俑盗⑷~變換(FFT),探討了聲波在爆破損傷巖體中傳播時(shí)的衰減特性,分析了聲波主頻、頻域內(nèi)最大振幅等巖體聲學(xué)參數(shù)隨爆破次數(shù)不斷增加的變化特性,同時(shí)探討了圍巖松動(dòng)圈厚度、聲波換能器間距、爆心距等因素的影響。研究結(jié)果表明,隨爆破次數(shù)增加,巖體爆生裂隙不斷增加和擴(kuò)展,聲波信號(hào)中的高頻成分不斷被吸收,低頻成分所占比例增加,主頻向低頻方向偏移,頻譜曲線畸變程度增加;聲波主頻比和頻域最大振幅比均呈非線性降低趨勢(shì),頻域最大振幅比對(duì)巖體爆破損傷的敏感性高于聲波主頻比;隨爆心距增大,巖體聲波頻譜變化程度逐漸減弱。聲波換能器間距越大,聲波主頻變化越大,頻域內(nèi)最大振幅衰減變化越顯著。研究成果對(duì)于豐富和完善巖體爆破累積損傷效應(yīng)聲學(xué)研究方法具有一定的參考意義。
[Abstract]:In order to reveal the accumulative damage effect of rock mass blasting and its internal relation with rock mass acoustics, 10 small explosive explosions were carried out in the surrounding rock of an underground engineering, and sound wave test was carried out in the field of rock mass damage. Based on the fast Fourier transform (FFT), the attenuation characteristics of acoustic waves propagating in damaged rock mass during blasting are discussed. The variation characteristics of acoustic parameters of rock mass such as the main frequency of acoustic waves and the maximum amplitude in frequency domain with the increasing of blasting times are analyzed. At the same time, the influence of the thickness of surrounding rock loose circle, the distance of acoustic transducer and the distance of detonation center are discussed. The results show that with the increase of blasting times, the explosive cracks in rock mass increase and expand, the high frequency components of acoustic signals are absorbed continuously, the proportion of low frequency components increases, the main frequency shifts to the low frequency direction, and the distortion degree of the spectrum curve increases. The acoustic wave frequency ratio and the frequency domain maximum amplitude ratio both show a nonlinear decreasing trend. The sensitivity of the frequency domain maximum amplitude ratio is higher than that of the acoustic wave main frequency ratio, and the variation degree of rock mass acoustic wave spectrum decreases with the increase of the core distance. The larger the distance between acoustic transducers, the greater the variation of the main frequency of the acoustic wave, and the more significant the change of the maximum amplitude attenuation in the frequency domain. The research results have certain reference significance for enriching and perfecting acoustical research method of rock mass blasting cumulative damage effect.
【作者單位】： 鄭州大學(xué)土木工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(No.U1504523) 河南省高等學(xué)校重點(diǎn)科研項(xiàng)目(No.15A410001)~~
【分類號(hào)】：TU45

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