煤岩破裂微震信号层理间传播频谱特征研究
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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.
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.
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.
引文
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[2]姜福兴,杨淑华,成云海,等.煤矿冲击地压的微地震监测研究[J].地球物理学报,2006,49(5):1511-1516.JIANG Fuxing,YANG Shuhua,CHENG Yunhai,et al.A study on microseismic monitoring of rock burst in coal mine[J].Chinese Journal of Geophysics,2006,49(5):1511-1516.
[3]谢和平,彭瑞东,鞠杨.岩石变形破坏过程中的能量耗散分析[J].岩石力学与工程学报,2004,23(21):3565-3570.XIE Heping,PENG Ruidong,JU Yang.Energy dissipation of rock deformation and fracture[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(21):3565-3570.
[4]Spetzler H,Sondergeld C,Sobolev G,et al.Seismic and strain studies on large laboratory rock samples being stressed to failure[J].Tectonophysics,1987,144(1-3):55-68.
[5]李俊平,余志雄,周创兵,等.水力耦合下岩石的声发射特征试验研究[J].岩石力学与工程学报,2006,25(3):492-498.LI Junping,YUZhixiong,ZHOUChuangbing,et al.Experimental studyon acoustic emission characteristics of rock concerning hydromechanicalcoupling[J].ChineseJournalofRockMechanicsandEngineering,2006,25(3):492-498.
[6]Read MD,Ayling MR,Meredith P G,et al.Microcracking during triaxial deformation of porous rocks monitored by changes in rock physical properties,II.pore volumometry and acoustic emission measurements on water-saturated rocks[J].Tectonophysics,1995,245(3/4):223-235.
[7]王恩元,何学秋,刘贞堂,等.煤体破裂声发射的频谱特征研究[J].煤炭学报,2004,29(3):289-292.WANG Enyuan,HE Xueqiu,LIU Zhentang,et al.Study on frequency spectrum characteristics of acoustic emission in coal or rock deformation and fracture[J].Journal of China Coal Society,2004,29(3):289-292.
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