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利用MTS815岩石力学试验系统和气体渗透试验系统,开展不同瓦斯压力下含瓦斯原煤煤样的3轴压缩声发射试验,研究含瓦斯煤破裂过程中声发射时空演化规律。试验结果表明,煤样内的声发射定位点随载荷增加逐渐密集且主要分布在主裂纹面附近;随着载荷的增加,单位载荷区间的声发射振铃数经历了初期的沉寂期、中期的低水平稳定期、峰值前的快速发展期和峰后的高水平稳定期,与煤样累计声发射振铃数变化特征类似;瓦斯压力增加增强了损伤前煤样的声发射活动,减小了煤样的初始损伤应力,促进了煤样的损伤发展。
Using MTS815 rock mechanics test system and gas permeation test system, the 3-axis compression acoustic emission test of methane-containing raw coal samples under different gas pressures was carried out to study the spatiotemporal evolution of acoustic emission during gas-ruptured coal-bearing coal. The experimental results show that the acoustic emission locating points in coal samples increase with load gradually and intensively and are mainly distributed near the main crack surface. With the increase of load, the number of acoustic emission per unit load has experienced the initial quiet phase, The low-level stable period, the rapid development period before the peak and the high-level stable period after the peak are similar to the characteristics of cumulative acoustic emission ring number of the coal sample; the increase of gas pressure enhances the acoustic emission activity of the pre-damage coal sample and decreases The initial damage of coal sample stress, promote the development of the damage of coal samples.