本文選題：巖石力學(xué) + 變形局部化��； 參考：《巖石力學(xué)與工程學(xué)報(bào)》2017年03期

【摘要】：對(duì)單軸壓縮條件下一種紅砂巖試件變形場(chǎng)演化過(guò)程中聲發(fā)射特征進(jìn)行研究。以數(shù)字散斑相關(guān)方法進(jìn)行試件加載全過(guò)程的變形場(chǎng)演化觀測(cè),利用聲發(fā)射系統(tǒng)采集試件加載全過(guò)程的聲發(fā)射信號(hào),對(duì)巖石變形演化過(guò)程中的變形局部化演化、變形局部化帶拉伸以及變形局部化帶錯(cuò)動(dòng)對(duì)應(yīng)的聲發(fā)射特征進(jìn)行研究,研究結(jié)果表明:(1)由加載曲線與聲發(fā)射振鈴計(jì)數(shù)、聲發(fā)射能量演化對(duì)應(yīng)關(guān)系可知,應(yīng)力突降時(shí)聲發(fā)射振鈴計(jì)數(shù)和聲發(fā)射能量出現(xiàn)激增,但振鈴計(jì)數(shù)激增和聲發(fā)射能量激增,應(yīng)力不一定突降;(2)加載應(yīng)力與聲發(fā)射振鈴累計(jì)計(jì)數(shù)在演化趨勢(shì)上具有較好的對(duì)應(yīng)關(guān)系,但聲發(fā)射振鈴累計(jì)計(jì)數(shù)增幅與對(duì)應(yīng)的應(yīng)力降低量值無(wú)關(guān);(3)聲發(fā)射峰前"平靜期"并不代表巖石變形場(chǎng)演化處于平靜階段,此階段變形局部化帶的寬度、長(zhǎng)度以及變形量值在不斷增加;(4)變形局部化帶的寬度、長(zhǎng)度以及變形量值的演化對(duì)聲發(fā)射振鈴計(jì)數(shù)及聲發(fā)射能量影響很小,變形局部化帶的拉伸速率及變形局部化帶的滑動(dòng)速率變化對(duì)聲發(fā)射振鈴計(jì)數(shù)和聲發(fā)射能量影響較大,其中變形局部化帶滑動(dòng)影響最大。
[Abstract]:The acoustic emission characteristics of a red sandstone specimen during the evolution of deformation field under uniaxial compression are studied. The deformation field evolution of the whole loading process is observed by digital speckle correlation method. The acoustic emission signals of the whole loading process are collected by acoustic emission system. The characteristics of acoustic emission (AE) corresponding to the stretching of the deformation localized band and the dislocation of the deformation localized band are studied. The results show that: (1) the relationship between the loading curve and the number of the acoustic emission ringing bell and the evolution of the acoustic emission energy can be seen. When the stress suddenly drops, the number of the acoustic emission ringing and the energy of the acoustic emission increase rapidly, but the number of the ringing and the energy of the acoustic emission surge, and the stress does not necessarily drop suddenly. (2) the loading stress and the accumulative counting of the acoustic emission ringing have a good corresponding relationship in the evolution trend. However, the accumulative increase of acoustic emission ringing count is independent of the corresponding stress reduction value. (3) the "quiet period" before the acoustic emission peak does not mean that the evolution of the rock deformation field is at a quiet stage, and the width of the localized deformation zone in this stage is not represented. (4) the evolution of the width, length and deformation value of the deformation localization zone has little effect on the acoustic emission ring count and acoustic emission energy. The variation of the tensile rate and the slip rate of the deformation localized band have great influence on the acoustic emission ring count and the acoustic emission energy, among which the deformation localization band has the greatest influence on the slip.
【作者單位】： 北方工業(yè)大學(xué)土木工學(xué)院;山東科技大學(xué)礦業(yè)與安全工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51474013)~~
【分類號(hào)】：TU45

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