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目前,关于瑞雷面波勘探的表面波谱分析法(SASW)和瞬态多道面波分析法(MASW)的理论研究和工程应用较多。但是两种方法各有优缺点,因此,本文综合两种方法,采用基于模态分离两道法(相位差法)对多道面波数据进行处理,提高了多道面波勘探的横向分辨率,同时又得到了多道地震排列中心点处更精确的频散曲线,可为反演提供更高精度的频散曲线。试验证明:通过对一炮12道面波数据处理,可同时得到地震排列较浅层二维速度剖面和该地震排列中点处高精度一维横波速度结构,在一定深度范围内反演结果可代替钻孔。该方法可作为能同时提高多道面波勘探的横向分辨率和垂向精度的一次试验性研究,本次试验研究可为解决实际地质问题提供试验技术的支持,在实际工程测试中,可大大提高多道面波信号的利用率。
At present, there are many theoretical researches and engineering applications about surface wave spectrum analysis (SASW) and transient multi-surface wave analysis (MASW) for Rayleigh surface wave prospecting. However, the two methods have their own advantages and disadvantages. Therefore, by combining the two methods, the method based on modal separation method (phase difference method) is used to process the data of the multi-faceted wave and improve the lateral resolution of multi-faceted wave exploration At the same time, more accurate dispersion curves are obtained at the center of multi-channel seismic arrangement, which can provide more accurate dispersion curves for inversion. The experiment proves that through the processing of one cannon 12-channel surface wave data, the shallow two-dimensional seismic velocity profile and the high-precision one-dimensional shear wave velocity structure at the midpoint of the seismic array can be obtained at the same time. The inversion results can be obtained within a certain depth range Instead of drilling. This method can be used as an experimental study that can improve the lateral resolution and vertical accuracy of multi-channel surface wave exploration at the same time. This experimental study can provide experimental technology support for solving practical geological problems. In practical engineering tests, this method can be greatly Increase the utilization of multi-channel surface wave signals.