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利用大型煤与瓦斯突出模拟试验系统,研制密封效果好、流变性能强的突出口材料及其制作工艺,模拟垂直和水平应力综合作用下自动触发煤与瓦斯突出的试验过程,利用高灵敏性的微震监测系统全程响应煤与瓦斯突出4个阶段,监测不同阶段突出腔体内的瓦斯压力,素描出突出孔洞大小和形状。微震响应信号分析频率0~2 000 Hz,优选小波基函数,确定小波包最大分解层数,采用小波包分解分析模拟突出孕育、激发、发生和残余4个阶段微震信号时频特征;孕育阶段为高频信号,激发阶段信号频带范围逐渐加宽直至出现低频信号,突出阶段全频带响应,残余阶段信号由相对较低频带逐渐向高频过渡。研究成果为微震预警煤与瓦斯突出提供基础试验依据。
Using large scale coal and gas outburst simulation test system, the research and development of sealing materials with excellent sealing effect and strong rheological properties and its manufacturing process are simulated. The experiment process of automatic triggering of coal and gas outburst under the combination of vertical and horizontal stress is simulated. By using high sensitivity The microseismic monitoring system responds to the four phases of coal and gas outburst throughout the entire project, monitors the gas pressure in the cavity at different stages, and sketches the size and shape of the protruding cavity. Microseismic response signal analysis frequency of 0 ~ 2 000 Hz, preferably the wavelet basis function to determine the maximum number of wavelet packet decomposition, using wavelet packet decomposition analysis to highlight the gestational, excitation, occurrence and residual four-phase microseismic signal time-frequency characteristics; gestational phase High-frequency signals, the excitation phase of the signal band widened gradually until the emergence of low-frequency signals, highlighting the whole band response, the residual phase signal from the relatively low frequency band gradually transition to high frequency. The research results provide basic test evidences for microseismic warning of coal and gas outburst.