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。
Mechanical properties and acoustic emission characteristics of briquette samples are studied under fixed gas pressure and confining pressure.The results show: mechanical properties discreteness of coal containing gas is decreased because of gas existing;triaxial strength is decreased and Young's modulus is increased compared with coal;acoustic emission events are comparatively well distributed in process of triaxial compression of coal containing gas;the concentrated regions only appear at near damage regions;the distribution of AE events amplitude shows three peaks mode,energy of AE events is increased as deformation increasing;AE events parameters lag behind triaxial compression curve.