三轴压缩下含瓦斯煤样破坏过程的声发射特性

为找到含瓦斯煤样破坏过程与声发射特性之间的关系，以曾经发生过煤与瓦斯突出事故且依然存在突出危险的煤样为研究对象，对其在饱和瓦斯、不同瓦斯压力和不同围压作用下的声发射特性进行研究。结果表明：含饱和瓦斯煤样随着破坏程度的加剧声发射事件振幅增多且增大，声发射事件撞击数呈增长趋势，声发射事件能量增加；随着瓦斯压力的增加，煤样破坏过程中的AE事件的幅值减小、AE事件撞击的总数减少、AE事件的平均能量降低；随着围压的增加，AE事件的幅值呈现减小、能量呈现上升、撞击数呈减少的趋势。该结论可以为预测煤与瓦斯突出提供参考。

Study of acoustic emission characteristics of coal containing gas under triaxial compression

Aimed at identifying the relationship between the failure process of the gas-containing coal samples and the characteristics of acoustic emission, this paper builds on the study of coal samples still vulnerable to prominent dangers following coal and gas outburst and describes a study of characteristics of acoustic emission, acted on by pressure of saturated gas and different gas and confining pressure. The exper- imental results suggest that saturated gas-containing coal samples shows an increasing amplitude of acoustic emission events along with the increasing degree of damage, accompanied by an increasingly greater impact number and energy of acoustic emission events. The increase of gas pressure is followed by reduction in the amplitude of AE events in damaging process of coal samples, in the total number of AE events impact, and in the average energy of acoustic emission. Along with the increase of confining pressure comes decrease in the amplitude of the AE event, rising trend in its energy, and decreasing trend in acoustic emission events number. This conclusion serves as a reference for prediction of gas and coal outburst.