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。
The uniaxial compression model of coal- rock is built by means of micro particle flow PFC2 Dsoftware 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.
出处
《煤矿安全》
CAS
北大核心
2016年第3期179-181,186,共4页
Safety in Coal Mines
基金
山东科技大学研究生创新基金资助项目(YC150309)
关键词
煤岩损伤
单轴压缩
加载速度
损伤演化
声发射特征
coal and rock damage
uniaxial compression
loading rate
damage evolution
acoustic emission characteristic
