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以型煤试件为研究对象,对其在固定瓦斯压力和围压作用下的力学性质和声发射特性进行了试验研究。结果表明:含有瓦斯后煤样试件的力学性质的离散性降低;与不含瓦斯煤样比较,含瓦斯煤样的三轴强度减小而杨氏模量增大;含瓦斯煤样三轴压缩过程中的声发射事件计数分布较均匀,仅在煤样破坏前出现密度较大区;声发射事件振幅分布呈现“三峰”分布特性,而事件能量随变形增加而逐渐增大;声发射各事件参数与三轴压缩曲线呈滞后对应关系。
Taking the briquette sample as the research object, the mechanical properties and acoustic emission characteristics under the action of fixed gas pressure and confining pressure were studied. The results show that the discrepancy of the mechanical properties of the coal samples with gas decreases, the triaxial strength of gas-bearing coal samples decreases and the Young’s modulus increases with the gas-free coal samples, Acoustic emission events in the compression process are more evenly distributed, and appear more dense areas only before the coal samples are destroyed. The amplitude distribution of acoustic emission events shows the distribution of “three peaks”, and the incident energy increases gradually with the increase of deformation. The parameters of launching events are lagging correspondingly with the triaxial compression curves.