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建立了含孔洞混凝土单轴压缩实验系统,通过分析含孔洞混凝土受载破裂过程的声电信号特征来揭示其破裂机理。实验发现含孔洞混凝土的破裂模式受骨料粒径和孔洞大小的影响,骨料越粗,声电信号发生突变的次数越多,孔洞越大,声电信号的峰值出现越早。材料声发射和电磁辐射水平与所受应力之间存在正相关耦合关系,但声发射与电磁辐射的变化并不完全同步。综合利用声发射和电磁辐射探测技术可以评价煤岩体的稳定性和预测预防岩爆的发生。
The uniaxial compression experiment system with hole concrete was established. The fracture mechanism was revealed by analyzing the acoustic and electrical signal characteristics during the loading and breakage process. The experimental results show that the fracture mode of concrete with holes is affected by the size of aggregate and the size of holes. The thicker the aggregate, the more the frequency of acoustic and electric signals is changed. The larger the holes, the earlier the peak of acoustic and electrical signals appears. There is a positive correlation between acoustic emission and electromagnetic radiation level and stress, but the changes of acoustic emission and electromagnetic radiation are not completely synchronized. Comprehensive utilization of acoustic emission and electromagnetic radiation detection technology can evaluate the stability of coal and rock mass and predict the occurrence of rock burst prevention.