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选取煤体试样,采用装备ESG微震监测系统的日本岛津公司生产的AG-I250KN型精密电子万能材料试验机,分析在剪切模式下,煤样强度及变形破坏特征,运用小波包能量谱理论,提取突变信号的频带能量和事件数,获得了煤样剪切条件下的应力应变曲线以及应力应变过程曲线中4个阶段的微震响应特征;在初始压密和弹性阶段,没有微震信号、频带归一化能量为0、事件数为0;在应力屈服阶段,微震信号多、频带归一化能量大、有大量事件数产生;在破坏阶段,微震信号丰富、频带归一化能量达到峰值后降低、事件数减少。分析得出煤样破裂微震信号频率响应主要集中在625~1 000 Hz。
Select coal samples, the use of ESG microseismic monitoring system Shimadzu Corporation AG-I250KN precision electronic universal testing machine, in shear mode, the characteristics of coal samples strength and deformation failure, the use of wavelet packet energy spectrum Theory, the band energy and event number of the abrupt signal were extracted, and the stress-strain curve and the microseismic response characteristics in four stages of the stress-strain process curve were obtained. In the initial compaction and elastic stage, there was no microseismic signal, In the stress yield phase, there are many microseismic signals and normalized energy in the frequency band with a large number of events. In the failure phase, the microseismic signal is rich and the band normalized energy reaches its peak value After the reduction, the number of incidents decreased. It is concluded that the frequency response of the fractured coal mine signal mainly lies in 625 ~ 1 000 Hz.