基于时频分析方法提取瞬态瑞利波频散曲线
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摘要
作为一种无损浅层勘探方法,瑞利波越来越多地应用于地震工程、环境工程及岩土工程测试中。其中,一项重要的工作是提取瑞利波的频散曲线。根据激振方式不同,瑞利波勘探可分为稳态法、瞬态法和地脉动台阵法。基于相位谱法提取瞬态瑞利波的频散曲线,一般将两通道瑞利波的相位差限制在2π之内,因此限制了两拾振器之间的布点距离。本文利用时频分析方法,分析了瞬态瑞利波法频散曲线的提取方法,避免了对相位差的限制。数值试验结果表明,采用时频分析方法提取到的频散曲线具有较高的精度。
As a nondestructive,shallow-layer test method,Rayleigh wave has been more and more used in earth-quake engineering,environment and geotechnical engineering,where an important step is extracting the dispersion curves.Due to different exciting modes,Rayleigh wave exploration can be divided into steady-state method,transient method and micro-tremor array method.It needs to restrict the distance of two sensors to meet the requirement that the phase-difference is from 0 to 2 based on the phase spectrum or frequency-wave number spectrum method.The dispersion curve extraction of transient Rayleigh wave is analyzed by using the time-frequency analysis method in this paper,which removes the restriction of the phase-difference.Numerical experiments show that the method has high precision.
As a nondestructive,shallow-layer test method,Rayleigh wave has been more and more used in earth-quake engineering,environment and geotechnical engineering,where an important step is extracting the dispersion curves.Due to different exciting modes,Rayleigh wave exploration can be divided into steady-state method,transient method and micro-tremor array method.It needs to restrict the distance of two sensors to meet the requirement that the phase-difference is from 0 to 2 based on the phase spectrum or frequency-wave number spectrum method.The dispersion curve extraction of transient Rayleigh wave is analyzed by using the time-frequency analysis method in this paper,which removes the restriction of the phase-difference.Numerical experiments show that the method has high precision.
引文
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[9]GBT50269-97地基动力特性测试规范[S].
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[2]伊文W.层状介质中的弹性波[M].刘光鼎译.北京:科学出版社,1966.
[3]Thomson W T.Transmission of elastic waves through a stratified solid medium[J].J.Appl.Phys.,1950(21):89-93.
[4]Haskall N A.The dispersion of surface waves on multilayered media[J].Bull Seism.Soc A.,1953(43):17-34.
[5]黄振平,杨学山,赵刚,等.瑞利波频谱分析法的研究[J].世界地震工程,1997,13(3):46-54.
[6]师黎静.基于地脉动的近地表三维速度结构探测和建模成像[D].哈尔滨:中国地震工程力学研究所博士论文,2007.
[7]陈云敏,吴世明,曾国熙.表面波谱分析方法及其应用[J].岩土工程学报,1992,14(3):61-65.
[8]师黎静,陶夏新,Robert Kayen,等.场地瑞利波频散特性的测试方法研究[J].地震工程与工程振动,2005,25(6):24-29.
[9]GBT50269-97地基动力特性测试规范[S].
[10]杨成林,等编著.瑞雷波勘探[M].北京:地质出版社,1993.
[11]邱颖,任青文.瞬态瑞利波勘探技术及其应用述评[J].水利水电科技进展,2004,24(3):66-68.
[12]刘康和,魏树满.瞬态面波勘探及应用[J].水利水电工程设计,2001,20(2):31-33.
[13]徐长发,李国宽.实用小波方法[M].2版.武汉:华中科技大学出版社,2004.
[14]彭文,王亮.瑞雷面波频散特征的时频分析方法及应用[J].物探化探计算技术,2006,28(3):233-237
[15]陈龙珠,严细水,赵永倩.关于面波法检测地基波速中的测点布置问题[J].岩土工程学报,2003,25(1):63-66.
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