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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。
The acoustic emission characteristics of the deformation field of a red sandstone specimen under uniaxial compression were studied. The digital speckle correlation method was used to analyze the deformation field during the whole process of specimen loading. Acoustic emission system was used to acquire the acoustic emission signals of the whole process of specimen loading. The deformation localization and deformation localization, (1) According to the relationship between the loading curve and the ringing counting of acoustic emission and the evolution of acoustic emission energy, it is known that the ringing counting of acoustic emission when the stress is suddenly dropped The harmonic emission energy increases sharply, but the ringing count increases sharply and the acoustic emission energy increases sharply, and the stress does not necessarily make a sudden drop. (2) The loading stress and ringing cumulative number of acoustic emission have a good correspondence in the evolution trend, but the acoustic emission (3) Before the acoustic emission peak “quiet period ” does not mean that the evolution of the rock deformation field is at a calm stage. The width, length and deformation of the deformation localization zone at this stage (4) The evolution of the width, length and deformation of the deformation zone has little effect on the ringing counting and acoustic emission energy of acoustic emission. The deformation localization zone And a tensile rate of change of slip rate localized deformation band of acoustic emission AE ring count greater impact energy, wherein the maximum Sliding localized deformation zone.