考虑高阶模态时SASW法的反演

成层地基中的Ｒａｙｌｅｉｇｈ波存在多个模态．通常假定实测Ｒａｙｌｅｉ吵波弥散曲线为基模态［２，３］，然而对一般成层地基来说有时高阶模态的作用占主导地位．因此在利用表面波频谱分析法（即ＳＡＳＷ法）反演地基参数时，有必要考虑高阶模态的影响．本文通过轴对称情况下成层地基表面竖向位移解的Ｒａｙｌｅｉ沙波项，分析ＴＲａｒｌｅｉｇｈ波各模态所占能量的相对大小，并提出用Ｒａｖｌｅｉｓｈ复合波的复合弥散曲线来模拟实测弥散曲线，从而给出了考虑高阶模态作用时ＳＡＳＷ法的反演方法．

Inversion technique for SASW method considering effects of higher Rayleigh wave modes

here are multipl Rayleigh wave modes in a layered soil. In the inversion processes ofSASW method,it was assumed that the observed dispersion curve was that of the fundatmental Rayleih mode previously. But in some case,the second mode (or higher mode) dominatesin a inversely dispersion soil. Thus,we have to consider the effects of higher mode in the inversion of soil parameters using observed dispersion curves.The writers have discussed the relative amount of energy of each Rayleigh mode by using the contribution of Rayleigh waves in the vertical displacement of ground surface. Basedon a apparent calculation of superposed dispersion curves of multipl Rayleigh wave modes,ainversion method considering the effects of higher modes is presented in this paper.