土中Love波弥散特性

利用有限单元法及解析法建立和求解了土中Love波特征方程以及位移计算公式．计算结果表明，这一计算方法比纯解析法优越，可以用来分析均质和非均质上中Love波弥散性．本文利用这一方法详细讨论了Love波在上软下硬地基及软夹层地基中的传播特性和弥散特性．上软下硬地基Love波具有弥散性，土层的剪切波及厚度对Love波弥散曲线影响较大，而质量密度的相对变化对Love彼弥散曲线影响较小．软夹层地基中低频时Love波以第一模态波为主，现场所测为第一模态波波速；高频时存在多个高模态波，土中传播的波为这几个高模态波的叠加波，现场所测波速随两传感器的位置不同而有波动．

DISPERSION CHARACTERISTICS OF LOVE WAVE IN SOILS

In this paper, the characteristic equation of Love wave in soils is founded and solved by using finite element method and analytical method. The formulation of calculating displacement is also generated. The results indicate that the presented method is more edvantagous than analyhcal method. It can be used to discuss the chacteristics of Love wave in homogeneous or nonhomogeneous soils. The propagation and dispersion charactoristics of Love wave in the layered soils in which shear wave velocity increases with depth and the interealary soils are discussed. Love wave is of dispersion characteristics in stalfied soils, in which shear wave velocity and Anchess of layer have considerable influence on dispersion curve, while mass density has minor one. In the soil system with a softer layer trapped between two stiffer layers, the first mode boe wave dominates in low frequency range. The wave velocity obtained in the field is tha of the first mode wave. Several mode waves exist in soil on high frequency range. The propagation wave through soil is the superimposition of waves which shows some fluchation as the location of the transducers changes during field measuremnts.