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本文针对三种常见的典型地质结构深入研究了瑞雷波多模式相互作用的叠加耦合机理。研究结果表明:对于递增模型,基阶波能量仍占主导地位,叠加频散曲线实际上就是基阶波频散曲线,此时不会出现“之”字形回折现象,反演分析时可仅利用基阶波信息;而对于低速软弱夹层或高速硬夹层等复杂地质结构,基阶波能量则在某些频段处于次要地位,叠加频散曲线是基阶波与各高模式波在相应频段相互叠加作用的结果,此时将会出现“之”字形回折现象,反演分析时应充分利用多模式表面波信息,以提高反演解释精度和可靠性。
In this paper, we investigate the superposition coupling mechanism of multi-mode interaction of Rayleigh waves for three common typical geological structures. The results show that for the incremental model, the fundamental-order wave energy still dominates, and the additive dispersion curve is actually the fundamental-order dispersion curve. At this time, the “ Only the fundamental wave information is used. For complex geological structures such as low-speed weak interbeds or high-speed hard interbeds, the fundamental-order wave energy is in a secondary position in some frequency bands. The superposition dispersion curve is that the fundamental- Frequency band superimposed on each other’s results, this time there will be ”" zigzag fold phenomenon, inversion analysis should make full use of multi-mode surface wave information to improve the interpretation accuracy and reliability of inversion.