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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。
The coal and rock uniaxial compression model was established by using the mesoscale PFC2D software platform, and the effect of different loading rates on the acoustic emission characteristics of coal damage evolution was simulated. The analysis results show that the loading speed has little effect on the acoustic emission characteristics of coal and rock damage and rupture. However, with the increase of the loading speed, the time of obvious acoustic emission will be ahead of time. The increase of loading rate has no significant effect on the initiation strain of coal rock. However, the range of strain caused by strong acoustic emission is increased. The greater the loading speed, the more deformation energy accumulated before coal and rock damage, and the higher the damage degree of coal and rock, the more total acoustic emission will be generated.