基于一种实用的Bo it模型,利用层状饱和土层的精确动力刚度矩阵,给出了层状饱和场地中线性分布荷载作用于与水平向有夹角的倾斜直线时的动力G reen函数,解决了利用间接边界元法分析局部地形对地震波散射及土-结构动力相互作用等研究中的关键问题。本文解答可以退化为W o lf弹性情况结果,最后进行了算例分析。
An analytical solution for surface motion of a semi-cylindrical hill for incident plane SV waves was derived by using the wave function expansion method and the auxiliary function technique, and convergence of the solution and accuracy of truncation were verified. The effect of incident frequency and angle as well as hill width on the surface motion of the hill was discussed by numerical examples. It was shown that, a hill greatly amplifies incident plane SV waves, and the maximal amplification may reach 4 times of that for free-field response; and for incident waves of low frequency, the maximal displacement amplitudes emerge mostly at the half-space, however, for inci-dent waves of high frequency, the maximal displacement amplitudes appear mostly at the hill.
A series solution for surface motion amplification due to underground group cavities for incident plane P waves isderived by Fourier-Bessel series expansion method. It is shown that underground group cavities significantly am-plify the surface ground motion nearby. It is suggested that the effect of subways on ground motion should be con-sidered when the subways are planned and designed.
