| 改进的等效半空间法及瑞雷波频散曲线反演 |
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| 引用本文： | 陈祥,孙进忠.改进的等效半空间法及瑞雷波频散曲线反演[J].地球物理学报,2006,49(2):569-576. |
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| 作者姓名： | 陈祥 孙进忠 |
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| 作者单位： | 中国地质大学（北京）工程技术学院, 北京 100083 |
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| 摘 要： | 层状模型的理论频散曲线表明，层状模型表面瑞雷波同一频率对应的相速度具有多值特点，这就是所谓的瑞雷波多阶性. 面波的多阶性导致了实测频散曲线的复杂性，当地层中存在软弱夹层时这一问题尤为突出，从而给实测频散曲线的解释带来了困难. 本文从工程实用的角度出发，根据等效半空间理论，提出了一种计算理论频散曲线的新算法——改进的等效半空间法，避开了面波多阶性这一复杂问题. 由此方法计算得到的面波相速度并不同于某个具体阶数的面波，而是对多阶面波的综合反映. 按照改进的等效半空间法编制了拟合反演程序，并在工程中进行了运用，取得较好的效果.
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| 关 键 词： | 瑞雷波 多阶性 频散曲线 改进的等效半空间法 拟合反演分析 |
| 文章编号： | 0001-5733（2006）02-0569-08 |
| 收稿时间： | 2005-01-17 |
| 修稿时间： | 2005-01-172005-11-22 |
An improved equivalent homogenous half_space method and reverse fitting analysis of Rayleigh wave dispersion curve |
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| CHEN Xiang,SUN Jin-Zhong.An improved equivalent homogenous half_space method and reverse fitting analysis of Rayleigh wave dispersion curve[J].Chinese Journal of Geophysics,2006,49(2):569-576. |
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| Authors: | CHEN Xiang SUN Jin-Zhong |
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| Institution: | School of Engineering and Technology, China University of Geosciences, Beijing 100083, China |
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| Abstract: | Theoretical analysis shows that there are several values of the phase velocity to a certain frequency of the Rayleigh wave on the surface of a layered medium, which is called the multiple rank property of Rayleigh wave. The multiple rank property of the surface wave results in the complication of measured dispersion curves, especially when a soft interlayer exists in the strata. This brings difficulties to the explanation of the dispersion curves measured on this kind of sites. In order to facilitate engineering applications, a new method, improved equivalent homogenous half-space method, is medium based on the equivalent homogenous multiple value problem of the phase velocity, to compute the theoretical dispersion curve of a layered half-space theory. This new method does not need to deal with the and the phase velocity resulting from this method can reflect the synthetic effect of all ranks of Rayleigh waves. The inverse fitting program is compiled based on the improved equivalent homogenous half-space method, which has gotten a very good effect in an engineering application. |
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| Keywords: | Rayleigh wave Multiple rank property Dispersion curve Improved equivalent homogenous halfspace method Inverse fitting analysis |
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