受载煤体电磁辐射的频谱特征
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摘要
对受载煤体变形破裂时电磁辐射(EME)的频谱特征进行了研究分析,研究结果表明,在受载煤体变形破裂过程中电磁辐射的频带很宽,其主频段随载荷的变化而发生变化,在受载初期,电磁辐射的主频带较低,电磁辐射主频带有时呈现先增高而后降低的趋势;在受载后期,电磁辐射的主频带较高,基本上表现为载荷越大,电磁辐射的主频段越高。
Research and analysis were carried on frequency spectrum characteristics of loaded coal's EME during deformation and fracture process. The research results show that the frequency zone is very wide during deformation and fracture process of loaded coal, the main frequency zone is changed with load change; at the initial stage of the load the main frequency zone of EME is low, and sometime it takes on the trend from raise to drop; at the later stage of the load the main frequency zone of EME is high, and its trend is that the larger the load is, the higher the main frequency zone is.
Research and analysis were carried on frequency spectrum characteristics of loaded coal's EME during deformation and fracture process. The research results show that the frequency zone is very wide during deformation and fracture process of loaded coal, the main frequency zone is changed with load change; at the initial stage of the load the main frequency zone of EME is low, and sometime it takes on the trend from raise to drop; at the later stage of the load the main frequency zone of EME is high, and its trend is that the larger the load is, the higher the main frequency zone is.
引文
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[2] Cress G O, Brady B T, Rowell G A. Sources of electromagnetic radiation from fracture of rock samples in laboratory[J]. Geophys. Res. Lett.,1987, 14 (4) : 331-334．
[3] Yamada I, Masuda K, Mizutani H. Electromagnetic and acoustic emission associated with rock fracture [J]. Phys. Earth Planet. Inter., 1989． 57 (3) : 157-168．
[4] 钱书清,任克新,吕智.伴随岩石破裂的VLF、MF、HF和VHF电磁辐射特性的实验研究[J].地震学报,1996,18(3) :346-351．
[5] [M]. 1968． 12-25．
[6] 郭自强,周大庄,施行党,等.岩石破裂中的光声效应[J].地理物理学报,1988,31(1) :37-41．
[7] 耿乃光,崔承禹,邓明德.岩石破裂实验中的遥感观测与遥感岩石力学的开端[J].地震学报,1992,14(增刊):645-652．
[8] 王恩元.含瓦斯煤破裂的电磁辐射和声发射效应及其应用研究[D].徐州:中国矿业大学能源科学与工程学院,1997．
[9] 王恩元,何学秋.煤岩变形破裂电磁辐射的实验研究[J].地球物理学报,2000,43(1) :131-137．
[10] 郭硕鸿.电动力学[M].北京:高等教育出版社,1995． 169-311．
[11] 熊皓.地震电磁前兆研究[A].国家地震科技监测司.震前电磁波观测与实验研究文集[C].北京:地震出版社,1989． 125-130．
[12] 勒热夫斯基B B,诺维克.岩石物理学基础[M].何修仁译.徐州:中国矿业大学出版社,1989． 95-102,191-195．
[13] 郭自强,刘斌.岩石破裂电磁辐射的频率特性[J].地球物理学报,1995,38(2) :221-226．
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