中文摘要：

为了研究冲击煤样破坏的前兆特征,利用煤岩声发射实验系统对冲击煤样进行了单轴压缩声发射实验,研究了煤样的破坏过程及声发射特征规律。结果表明：声发射活动与载荷及煤样变形破坏具有较好的相关性;冲击煤样的声发射通常在载荷达到最大,试样完全失稳破坏时才会密集出现,表现出产生明显的＂群震＂特征,峰后基本上无信号产生。分析发现,在临近应力峰值附近声发射变异系数会陡然增大,并且变异系数的斜率也较大,这预示着煤样失稳破坏的发生。

英文摘要：

In order to study the omen features of the bumping coal example failure,a coal and rock sonic transmitting experiment system was applied to conduct the uniaxial compression sonic transmitting experiment on the bumping coal sample and to study the failure process of the coal sample and the sonic transmitting feature law.the results showed that the sonic transmitting activity would have a good relativity with the loading and the sample deformation and failure.The sonic transmitting of the bumping coal sample would be occurred when the load reached at the max.The sonic transmitting of the bumping coal sample intensively occurred when the sample completely lost the stability and failed with obvious ＂group seismic＂ features occurred.After the peak,there would be no signal occurred.The analysis showed that near the critical stress peak,the variance coefficients of the sonic transmitting would be suddenly increased and the inclined rate of the variance coefficients would be high.Thus the stability lost and failure of the coal sample would be occurred.