加载速度对煤岩损伤演化声发射特征的影响分析
Effect of Loading Rate on Acoustic Emission Characteristics of Coal-rock Damage Evolution
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摘要: 借助细观颗粒流PFC2D软件平台建立煤岩单轴压缩模型，模拟了不同加载速度对煤岩损伤演化声发射特征的影响。分析结果表明：加载速度对煤岩损伤破裂声发射特征规律的影响不大，但伴随加载速度的增大，产生明显声发射的时间将提前；加载速率的提高对煤岩初始发射起裂应变没有影响，但使产生强烈声发射的应变范围增加；加载速度越大，煤岩破坏前积聚的变形能越多，煤岩破坏损伤程度越高，产生的声发射总数越多。Abstract: The uniaxial compression model of coal-rock is built by means of micro particle flow PFC2D software platform, and the influence of different loading speed on the acoustic emission characteristics of coal-rock damage evolution is simulated. Analysis results show that the loading rate has little effect on the acoustic emission law of coal-rock damage evolution, but with the increase of the loading rate, the occurrence time of the acoustic emission will be advanced; the increase of the loading rate has no effect on the initial emission damage strain of the coal-rock, but the strong acoustic emission strain range raised. The higher the loading speed, the more deformation energy accumulation, the higher the damage degree of coal-rock and the more the total number of the acoustic emission.
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