瞬态瑞雷波法在地基加固检测中的应用

Application of transient Rayleigh wave method in the detection of ground consolidation

从瑞雷面波在具有表面层介质中的传播情况入手,得出成层介质中的瑞雷波具有频散特性.利用二维傅式变换可以将时间—空间域的瑞雷波信号转换为二维频率波数谱,从中选择和提取瑞雷基波,有效地压制干扰波.加固前后瑞雷波波速在纵向和横向的变化,直接反映出地基的加固程度和均匀性,从而简单。

The paper begins with the propagation of Rayleigh wave in the media with surface layer, educes that the Rayleigh wave have the property of dispersion in layered media. According to two-dimension Fourier transform, the Rayleigh wave signal in time-space domain can be changed into two-dimension frequency wavenumber spectrum from which we can choose, pick up Rayleigh wave and suppress interference wave successfully. The longitudinal and transverse change of Rayleigh wave velocity before and after treatment can directly reflect the degree and uniformity of consolidation. Consequently, we can estimate the effect of the ground consolidation simply and effectively.