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基于瑞雷波在层状介质中的传播理论,可以对地表实测瑞雷波进行频散分析,从而对地下岩土介质的物性差异给予判断分析。这种方法在岩土工程勘察检测领域得到了越来越多的应用。本文将两道瑞雷波应用于路基压实度检测问题。利用Matlab软件中的绝对相位展开技术,提取了两道瑞雷波之间的相位差信息,进而提取频散曲线。再根据半波长理论以及瑞雷波相速度与路基土的干密度关系,给出了干密度随深度变化的曲线,最后将多个测点的干密度曲线排列在一起,为检测路基的压实程度提供了很好的参照。另外,基于Matlab和Vc++开发了一套界面友好的两道瑞雷波路基密实度检测软件。本文的研究说明两道瑞雷波法用于检测路基压实度是行之有效的。
Based on the Rayleigh waves propagation theory in layered media, the dispersion of surface measured Rayleigh waves can be analyzed, and the physical properties of underground geotechnical media can be judged and analyzed. This method has been more and more applied in the field of geotechnical investigation. In this paper, two Rayleigh waves are applied to the subgrade compaction detection. Using the absolute phase unwrapping technique in Matlab software, the phase difference information between two Rayleigh waves is extracted, and then the dispersion curve is extracted. According to the half-wave theory and the relationship between the Rayleigh wave velocity and the dry density of subgrade soil, the curve of dry density with depth is given. Finally, the dry density curves of several measuring points are arranged together. Degree provides a good reference. In addition, based on Matlab and Vc ++, a set of interface friendly Rayleigh wave embankment density testing software was developed. The research in this paper shows that the two-channel Rayleigh wave method is effective in detecting subgrade compaction degree.