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对6种不同高径比岩石试样进行数值模拟研究,讨论了不同高径比值下声发射之间的关系,得出了声发射的时间序列特征和空间分布的规律:H/D>1时,达到应力峰值前,声发射频度及能量极少,且弥散、随机的过程较长;当达到峰值时,声发射频度和能量达到历史最大,主要分布在试样中部。H/D≤1时,在初期声发射已有出现,达峰值应力前有声发射突跃,且能量也较大,出现声发射带;达到峰值应力和在峰值过后仍有几次频度较高的声发射。这些特征为用压力机做实验时,控制一定高径比尽量避免岩石试样破裂过程受垫板干扰提供了参考依据,对预测岩石破裂来临及位置具有一定的参考意义。
Six kinds of rock samples with different height-diameter ratios were studied by numerical simulation. The relationship between acoustic emission at different ratios of height-diameter ratios was discussed. The time-series characteristics of acoustic emission and the spatial distribution were obtained. When H / D> 1 Before reaching the peak of stress, the frequency and energy of acoustic emission are very few, and the process of dispersion and randomization is longer. When the peak is reached, the frequency and energy of acoustic emission reach the maximum, mainly distributed in the middle of the sample. When H / D is less than 1, acoustic emission has appeared at the initial stage, before the peak stress, there is a sudden jump of acoustic emission and the energy is also large, and the acoustic emission band appears; peak stress is reached and a few times higher after the peak value Acoustic emission. These characteristics provide a reference for controlling the height-to-diameter ratio of the rock specimen to avoid interference with the backing plate in the process of breaking the rock specimen as much as possible during the experiment with the press, which is of certain reference significance for predicting the location and location of the rock failure.