岩石单轴压缩变形场演化的声发射特征研究

发布时间：2018-06-30 18:52

本文选题：岩石力学 + 变形局部化　；参考：《岩石力学与工程学报》2017年03期

【摘要】：对单轴压缩条件下一种红砂岩试件变形场演化过程中声发射特征进行研究。以数字散斑相关方法进行试件加载全过程的变形场演化观测,利用声发射系统采集试件加载全过程的声发射信号,对岩石变形演化过程中的变形局部化演化、变形局部化带拉伸以及变形局部化带错动对应的声发射特征进行研究,研究结果表明:(1)由加载曲线与声发射振铃计数、声发射能量演化对应关系可知,应力突降时声发射振铃计数和声发射能量出现激增,但振铃计数激增和声发射能量激增,应力不一定突降;(2)加载应力与声发射振铃累计计数在演化趋势上具有较好的对应关系,但声发射振铃累计计数增幅与对应的应力降低量值无关;(3)声发射峰前"平静期"并不代表岩石变形场演化处于平静阶段,此阶段变形局部化带的宽度、长度以及变形量值在不断增加;(4)变形局部化带的宽度、长度以及变形量值的演化对声发射振铃计数及声发射能量影响很小,变形局部化带的拉伸速率及变形局部化带的滑动速率变化对声发射振铃计数和声发射能量影响较大,其中变形局部化带滑动影响最大。
[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.
【作者单位】：北方工业大学土木工学院;山东科技大学矿业与安全工程学院;
【基金】：国家自然科学基金资助项目(51474013)~~
【分类号】：TU45

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