煤岩变形破坏过程微震信号的实验研究

Research on the Microseismic Signals in the Process of Coal and Rock Deformation and Failure

采用实验室实验,测试了煤岩变形破坏的微震信号,对比分析了煤岩变形破坏微震信号的规律及特征,初步探讨其机理。结果表明,煤样和岩样在主破裂发生前呈现出很弱的微震信号,即破坏发生前主频带变宽,应力达到最大值,信号频率最复杂,煤样在该阶段已经进入危险状态,必须立刻采取相应的措施。因此,可以利用煤岩变形破坏发出的微震信号变化特征,预测预报煤岩动力灾害发生。

The microseismic signals of the coal and rock deformation and failure are monitored by the laboratory experiment method. The regularity and characteristics of microseismic signals of coal and rock deformation and failure are contrastive analyzed. Besides that, the mechanism of coal and rock deformation and failure is discussed. The research results show that, the coal and rock samples showing a weakly mieroseismic signals before the main fracture ,that is to say ,the main frequency zone is widen before the damage occurs, when the stress reach the maximum, the frequency of signals are complex, so, it is indicated that, the stage of coal samples enter a state of dangerous,it is necessary to take some appropriate measures to deal with them. Therefore, the change characteristics of microseismie signals of coal and rock deformation and failure can be used to predict the happens of coal and rock dynamic disasters.