【摘要】 利用煤岩破裂微震试验系统,研究了煤岩单轴压缩过程中微震信号沿平行层理传播与垂直层理传播的规律,并结合EMD分析方法对煤岩体破裂过程中产生的微震信号在沿平行层理方向与垂直层理方向的传播进行了频谱对比分析.研究结果表明,煤岩微震信号在沿平行层理各方向传播过程中振幅及速度变化十分微小,但在垂直层理传播过程中,微震信号则有明显的延迟现象,其振幅衰减十分明显,证实了层理对微震波传播的主要影响表现在以下2个方面:(l)信号延迟;(2)信号衰减.更多还原

【Abstract】 With coal rock outburst microseismic test experimental system,the propagation law of microseismic signals along the vertical and parallel direction to bedding was analyzed in the process of coal rock under uniaxial compression.In addition,we conducted a spectrum comparative analysis on the microseismic signals transmitting with empirical mode decomposition(EMD) method.Results showed that amplitude and velocity of microseismic signals changed very little along the parallel direction to bedding in the process of propagation,but microseismic signals delayed and amplitude weakened obviously along the vertical direction to bedding.It confirmed that the main effect that bedding impact on microseismic wave transmitting is in the following two aspects,i.e.signal propagation delay and signal attenuation.更多还原