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常规相邻道频散曲线计算方法通常采用等频率间隔的快速傅里叶变换,其低频段频点采样间隔相对过大,深层信息成像能力较差。为了克服以上缺点,文中对相邻道频散曲线计算方法进行了改进,通过对瑞雷波记录进行频谱分析,确定计算频散曲线的频率区间,对频率区间按对数值等分,得到一系列变频率间隔的频率点,使高频到低频频点采样间隔逐渐变小,减小低频段的频率采样间隔,提高了瞬态瑞雷波法对低频段、深层结构的成像能力。相邻道瞬态瑞雷波法被成功应用于水泥土搅拌桩检测,验证了该方法的正确性和有效性。
Conventional adjacent channel dispersion curve calculation method usually adopts the equal frequency interval fast Fourier transform, the sampling frequency of the low frequency band is relatively large, and the deep information imaging capability is poor. In order to overcome the above shortcomings, this paper improves the calculation method of the dispersion curve of adjacent channels. Through the spectrum analysis of Rayleigh wave records, the frequency range of the dispersion curve is determined. Based on the logarithm of the frequency range, a series of The frequency points of variable frequency interval make the sampling interval from high frequency to low frequency frequency point smaller and smaller, which reduces the frequency sampling interval of low frequency band and improves the imaging ability of transient Rayleigh wave method for low frequency band and deep structure. The adjacent-channel transient Rayleigh wave method has been successfully applied to the testing of cement-soil mixing piles, which verifies the correctness and effectiveness of the method.