本文關(guān)鍵詞： 爆破損傷 累積效應(yīng) 聲波測(cè)試 頻譜特征 快速傅立葉變換　出處：《地下空間與工程學(xué)報(bào)》2017年02期 　論文類型：期刊論文

【摘要】：為揭示巖體爆破損傷累積擴(kuò)展規(guī)律及其與巖體聲學(xué)變化特性之間的內(nèi)在聯(lián)系,在某地下工程圍巖中進(jìn)行了10次小藥量爆破巖體損傷的現(xiàn)場聲波測(cè)試。為充分利用巖體聲波測(cè)試信號(hào)中的有效信息,彌補(bǔ)單純聲波速度分析的不足,基于快速傅立葉變換(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。研究結(jié)果表明,隨著爆破次數(shù)增加,巖體聲波頻譜特征呈現(xiàn)如下變化規(guī)律:(1)巖體爆生裂隙不斷增加和擴(kuò)展,聲波測(cè)試信號(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;(2)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;(3)隨著爆心距的增大,巖體聲波頻譜變化程度逐漸減弱。
[Abstract]:In order to reveal the cumulative propagation law of rock mass blasting damage and its internal relation with rock mass acoustical variation, In order to make full use of the effective information of rock mass acoustic wave test signal and to make up for the deficiency of pure acoustic velocity analysis, the field acoustic wave test of rock mass damage was carried out in the surrounding rock mass of a certain underground project. Based on 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 main frequency and maximum amplitude in frequency domain with the increase of blasting times are analyzed. With the increase of blasting frequency, the frequency spectrum of rock mass acoustic wave presents the following law of change: 1) the crack caused by rock mass explosion is increasing and expanding, the high frequency component of acoustic wave signal is continuously absorbed, and the proportion of low frequency component increases. When the main frequency shifts to the low frequency direction, the distortion degree of the spectrum curve increases. (2) both the principal frequency ratio and the maximum amplitude ratio in frequency domain show a nonlinear decreasing trend. The sensitivity of the maximum amplitude ratio in frequency domain to rock mass blasting damage is higher than that of the main frequency ratio of acoustic wave.) with the increase of the core distance, the frequency spectrum of rock mass acoustic wave becomes weaker.
【作者單位】： 鄭州大學(xué)土木工程學(xué)院;鄭州科技學(xué)院土木建筑工程學(xué)院;
【基金】：國家自然科學(xué)基金(U1504523) 河南省高等學(xué)校重點(diǎn)科研項(xiàng)目(15A410001)
【分類號(hào)】：TU452

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本文編號(hào)：1517349