【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。更多还原

【Abstract】 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.更多还原