基于时频分析方法提取瞬态瑞利波频散曲线  

Dispersion curve extraction of transient Rayleigh wave based on time-frequency analysis method

作　　者：孔令召[1] 侯兴民[1] 陈建立[1] 

机构地区：[1]烟台大学土木工程学院,山东烟台264005

出　　处：《地震工程与工程振动》2008年第6期8-13,共6页Earthquake Engineering and Engineering Dynamics

基　　金：教育部科学技术研究重点项目;山东省教育厅科技计划项目(207062);山东省优秀中青年科学家科研奖励基金(bs08003);地震工程与工程振动开放实验室资助项目(2007B01)

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 earthquake engineering, environment and geoteehnical 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, transint 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.

关 键 词：瞬态瑞利波 频散曲线 时频分析法 

分 类 号：P631.4[天文地球—地质矿产勘探] TU472.35[天文地球—地质学]