煤体破裂过程中电磁信号低频特性研究
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摘要
利用煤岩低频电磁辐射实验系统,采集型煤试样单轴压缩加载过程中的低频电磁辐射信号。基于希尔伯特-黄变换(HHT)的降噪原理去除高频噪声,得到有效低频电磁信号成分,并将有效低频电磁辐射信号幅值和压力进行关联分析,得出低频电磁辐射信号的能量变化规律和频率分布范围。结果表明:在型煤压密阶段,低频电磁信号幅值和能量较大;在煤体线弹性阶段,会阵发性的产生低频电磁信号,但是其能量较弱;在型煤破裂阶段,低频电磁信号幅值和能量急剧增强。低频电磁辐射信号的频段范围为0~18 Hz,型煤破裂过程电磁信号具有较明显的低频特性,且幅值和能量的变化能很好地反映型煤的破裂状况。
Using low-frequency electromagnetic radiation experiments of coal and rock,the paper received low-frequency electromagnetic radiation signal through Briquette experiments under uniaxial loading experiments. Effectively low frequency electromagnetic signals are obtained through removing high-frequency noise based on HHT reduction principle,the paper analyzed amplitude and pressure relationship of effective low-frequency electromagnetic radiation signal and drew the energy variation laws of low-frequency electromagnetic signal and frequency range. Analysis results showed that amplitude and energy of low frequency electromagnetic signal became larger in the Briquette compaction stage; in the coal linear elastic stage,low-frequency electromagnetic signals were paroxysmal generated,however,its energy was weaker; in briquette rupture stage,low-frequency electromagnetic signal amplitude and energy was dramatically strengthened. Frequency range of low-frequency electromagnetic radiation signal was located between 0 to 18 Hz,electromagnetic signal generated in the process of briquette rupture had a good low frequency characteristics and the changing amplitude and energy could well reflect the situation of briquette rupture.
Using low-frequency electromagnetic radiation experiments of coal and rock,the paper received low-frequency electromagnetic radiation signal through Briquette experiments under uniaxial loading experiments. Effectively low frequency electromagnetic signals are obtained through removing high-frequency noise based on HHT reduction principle,the paper analyzed amplitude and pressure relationship of effective low-frequency electromagnetic radiation signal and drew the energy variation laws of low-frequency electromagnetic signal and frequency range. Analysis results showed that amplitude and energy of low frequency electromagnetic signal became larger in the Briquette compaction stage; in the coal linear elastic stage,low-frequency electromagnetic signals were paroxysmal generated,however,its energy was weaker; in briquette rupture stage,low-frequency electromagnetic signal amplitude and energy was dramatically strengthened. Frequency range of low-frequency electromagnetic radiation signal was located between 0 to 18 Hz,electromagnetic signal generated in the process of briquette rupture had a good low frequency characteristics and the changing amplitude and energy could well reflect the situation of briquette rupture.
引文
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[2]Хамиащвили,Н.Г.Coprime On the alkali halide crystal anthology[M].Beijing:Earthquake Press,1989.
[3]V.I.Frid,A.N.shabarov,V.H.Proskuryakov,et al.Formation of electromagnetic radiation in coal stratum[J].Soviet Mining science,1992,28(2):139-145.
[4]Frid,V..Electromagnetic radiation method for rock and gas outburst forecast[J].Journal of Applied Geophysics,1997,38(2):97-104.
[5]钱书清,张以勤,曹惠馨,等.花岗岩洞爆破时伴随岩石破裂的电磁辐射[J].地球物理学报,1983,26(增):887-893.
[6]钱书清,张以勤,曹惠馨,等.岩石破裂时产生电磁脉冲的观测与研究[J].地震学报,1986,8(3):301-308.
[7]孙正江,王丽华,高宏.岩石破裂时的电磁辐射和光发射[J].地球物理学报,1986,29(5):491-495.
[8]徐为民,童芜生,王自成.单轴压缩下岩样破坏过程中的发光现象[J].地震学报,1984(1):8-10.
[9]徐为民,童芜生,吴培稚.岩石破裂过程中电磁辐射的实验研究[J].地球物理学报,1985,28(2):181-189.
[10]李均之,夏雅琴,沈壮.岩石破裂辐射电磁波使用研究与地震预报[C]//震前电磁波观测与实验研究文集.北京:地震出版社,1989.
[11]郭自强,周大庄,施行觉,等.岩石破裂中的光声现象[J].地球物理学报,1988,31(1):37-41.
[12]何学秋,周广来,刘贞堂.含瓦斯煤的能量耗散过程及突出非接触预测[J].煤炭科学技术,1993,21(12):18-21.
[13]刘明举.含瓦斯煤断裂电磁辐射及其在煤与瓦斯突出研究中的应用[D].徐州:中国矿业大学,1994.
[14]何学秋,刘明举.含瓦斯煤岩破坏电磁动力学[M].徐州:中国矿业大学出版社,1995.
[15]撒占友.煤岩流变破坏电磁辐射效应与异常判识技术的研究[D].徐州:中国矿业大学,2003.
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