煤样巴西劈裂试验声发射能量幂律分布规律

Power-Law Distribution of Acoustic Emission Energy of Coal Samples in Brazilian Test

为了研究煤拉伸破坏过程中声发射能量分布规律,以及采用平均场理论的纤维束模型在煤拉伸破坏过程中声发射特征数值模拟的适用性,对原煤进行不同加载速率下的巴西劈裂试验.结果表明,煤样抗拉试验中声发射能量概率密度分布符合幂律分布,其幂律分布指数与平均场理论模型的预测分布指数相近;不同时间区间的声发射能量概率密度分布也满足幂律分布;试验结果与采用平均场理论纤维束模型数值模拟结果相符,为纤维束模型参数确定提供了依据.

In order to study the acoustic emission energy distribution and the feasibility of fiber bundle model based on mean field theory in numerical simulation on acoustic emission characteristics during the tensile damage process of coal,Brazilian tests on coal specimen were carried out under different loading rates.The results showed that the acoustic emission energy probability density distribution follows a power-law distribution and its distribution exponents are close to the predicted value of the mean field theory model.At the same time,the acoustic emission energy probability density distribution also follows a power-law distribution within different time intervals.The test results are similar to numerical results of the mean field theory based fiber bundle model,and provide a basis for the confirmation of the fiber bundle model parameters.