| 瑞利波勘探中"之"字形频散曲线研究 |
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| 引用本文： | 张碧星,鲁来玉,鲍光淑.瑞利波勘探中"之"字形频散曲线研究[J].地球物理学报,2002,45(2):263-274. |
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| 作者姓名： | 张碧星 鲁来玉 鲍光淑 |
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| 作者单位： | 1. 中国科学院声学研究所,北京100080;
2. 中南大学资源环境与建筑工程学院,长沙410083 |
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| 基金项目： | 国家自然科学基金项目 ( 1 980 4 0 1 9) |
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| 摘 要： | 研究了弹性层状半空间中导波的多模性问题,说明了关于瑞利波勘探中"之"字形频散曲线的形成机理.证明由单个的导波模式不可能得到"之"字形频散曲线,并从能量的角度出发,研究了各模式的实际强度与地层参数的关系,克服了从相速度的角度解释"之"字形频散曲线的困难.还深入研究了地表下低速层介质的位置、厚度及其他参数对"之"字形频散曲线的相互影响.与实际资料进行了对比分析,理论结果和实际情况基本相符.
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| 关 键 词： | 瑞利波 频散曲线 导波 低速层. |
| 文章编号： | 0001-5733(2002)02-0263-12 |
| 收稿时间： | 2000-12-06 |
A STUDY ON ZIGZAG DISPERSION CURVES IN RAYLEIGH WAVE EXPLORATION |
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| ZHANG BI XING LU LAI YU BAO GUANG SHU Institute of Acoustics,Chinese Academy of Sciences,Beijing ,China College of Resource,Environment and Civil Engineering,Central South University,Changsha ,China.A STUDY ON ZIGZAG DISPERSION CURVES IN RAYLEIGH WAVE EXPLORATION[J].Chinese Journal of Geophysics,2002,45(2):263-274. |
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| Authors: | ZHANG BI XING LU LAI YU BAO GUANG SHU Institute of Acoustics Chinese Academy of Sciences Beijing China College of Resource Environment and Civil Engineering Central South University Changsha China |
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| Institution: | 1. Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080, China 2) College of Resource, Environment and Civil Engineering, Central South University, Changsha 410083, China |
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| Abstract: | The guided waves in the elastic multilayered media are studied, and the mechanism of zigzag dispersion curves in the Rayleigh wave exploration is analyzed further. It is proved that the zigzag dispersion curve can not be created by a guided mode. The relation of excitation intensities of each mode to the information parameters is studied. It is noted that many results about zigzag dispersion curves can not be obtained by the previous literatures. The effects of the position and thickness of the low velocity layer and other parameters on the zigzag dispersion curves of Rayleigh wave are also analyzed. Finally, the comparative analyses between the practical data and theoretical results are carried out. Theoretical results are consistent to the practical data. |
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| Keywords: | Rayleigh wave Dispersion curves Guided waves Low velocity layer |
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