本文使用显式有限元法分析了三个二维不规则地形对地震波的放大效应,提出在城市小区划工作中,用在一维分析得到的设计谱上乘以二维放大系数(1+α_L)的方法考虑二维场地局部放大影响。为工程使用方便,文中建议对不同超越概率水准的入射波得到的α_L值取平均,并分等级给出简单适用的二维修正系数α_L。 This paper uses the explicit finite element method to analyze the amplification effect of three-dimensional irregular terrain on seismic waves. It is proposed that in the urban community planning work, the design spectrum obtained by one-dimensional analysis is multiplied by the two-dimensional magnification factor (1+α_L). The method considers the effect of local magnification on a two-dimensional site. For the convenience of the project, it is proposed to average the α_L values ​​obtained from different incident wave levels beyond the probabilistic level and to give a simple and applicable two-dimensional correction factor α_L.