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饱和半无限体表面透水性会影响表面波(瑞利波和斯通利波)存在及其传播特性。在表面透水情况下,只有瑞利波存在,而在不透水情况,不仅有瑞利波而且还有斯通利波。表面波在工程勘探及声波测试中扮演很重要角色,因此,有必要研究表面透水性对表面波传播特性的影响。采用薄层法,将表面波频率方程根的搜索问题转换成求特征值问题。根据表面波沿深度衰减特性,从一组计算的特征值及特征向量中筛选出与表面波对应特征值、特征向量,由特征值得到表面波频率特性(频散和衰减特性),由特征向量得到孔隙压力、骨架位移随深度变化,进而分析在表面不透水情况下瑞利波和斯通利波影响深度及程度。
Saturated semi-infinite body surface water permeability will affect the existence of surface waves (Rayleigh waves and Stoneley waves) and its propagation characteristics. In the case of seepage on the surface, only Rayleigh waves exist, and not only Rayleigh waves but also Stoneley waves in impervious conditions. Surface waves play an important role in engineering exploration and acoustic testing. Therefore, it is necessary to study the influence of surface water permeability on the propagation characteristics of surface waves. Using the thin layer method, the search problem of the root of the surface wave frequency equation is converted into the eigenvalue problem. According to the attenuation characteristics of surface wave along the depth, the corresponding eigenvalues and eigenvectors corresponding to surface waves are screened from a set of calculated eigenvalues and eigenvectors, and the surface frequency characteristics (dispersion and attenuation characteristics) are obtained from the eigenvalues. From the eigenvectors Get the pore pressure, the displacement of the skeleton changes with the depth, and then analyze the depth and extent of the Rayleigh and Stoneley waves in the case of impervious surface.