不同强度煤样加载过程声发射及损伤特征分析

Analysis of Acoustic Emission and Damage Characteristics of Coal Samples with Different Strength in Loading Process

为了研究不同强度煤样破坏时声发射响应差异性,对不同强度煤样,开展了单轴加载过程声发射测试实验。测试结果显示:声发射变化呈现阶段性特征,可以分为零星声发射产生阶段、声发射逐渐增加过渡阶段、声发射快速增加阶段、声发射趋于稳定阶段;并且随着强度的增加,零星声发射产生阶段变长,声发射计数参数峰值增加。

In order to study the difference of acoustic emission response of coal samples with different strength. The acoustic emission test experiments of coal samples with different strength were carried out. The test result showed that： the change of acoustic emission showed the stage characteristics, and it can be divided into four stages： the stage of sporadic acoustic emission generation, the transition phase of acoustic emission increasing gradually, the phase of acoustic emission increasing rapidly, the stage of acoustic emission tending to stable. And with the increase of the intensity, the generation stage of sporadic acoustic emission becomes longer, and the maximum value of the acoustic emission count parameter increases.