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本文简要叙述了相邻道瞬态瑞雷波法的工作原理,结合黄土区窑洞探测实例详细介绍了瑞雷面波的提取方法和相邻道计算频散曲线方法。理论和工程实例对比试验研究表明:采用-p域与时空域联合提取瑞雷面波,波场分离效果更佳,相对于传统的f-k域滤波有了明显的改善,提高了勘探成果的可靠性;采用相邻道计算频散曲线,消除了多道瞬态瑞雷波法的平均效应,提高了瑞雷面波法横向分辨率,能较真实反映地下较小范围内的横向局部异常;通过提高频散曲线的低频段的分辨能力,提高了瑞雷面波的纵向分辨率和纵向局部异常的分辨能力,从而准确判定地下窑洞分布的位置及深度。
In this paper, the working principle of transient Rayleigh wave propagation in adjacent channels is briefly described. The extraction method of Rayleigh surface waves and the method of calculating the dispersion curves of adjacent channels are introduced in detail in combination with the example of cave exploration in loess area. Theoretical and engineering examples of comparative experimental studies show that: the combination of-p domain and space-time domain extraction Rayleigh wave surface wave field separation better, compared to the traditional fk domain filtering has been significantly improved and improved the reliability of exploration results The adjacent curve is used to calculate the dispersion curve, which can eliminate the average effect of multi-channel transient Rayleigh wave method and improve the horizontal resolution of Rayleigh wave surface method, which can more accurately reflect the horizontal local anomaly in the underground area. Improve the resolving power of the low frequency band of the dispersion curve and improve the resolution of longitudinal resolution and vertical local anomaly of Rayleigh waves so as to accurately determine the location and depth of underground cave distribution.