软弱夹层特性对地震波强度影响的模拟研究  

MODELLING OF THE EFFECTS OF PROPERTIES OF A BURIED WEAK LAYER ON SEISMIC WAVES

作　　者：黄润秋[1] 余嘉顺[2] 

机构地区：[1]成都理工大学地质灾害防治国家专业实验室,成都610059 [2]新西兰皇家地质与核科学研究所

出　　处：《工程地质学报》2003年第3期312-317,共6页Journal of Engineering Geology

摘　　要：模拟了隐伏软弱夹层的弹塑性参数对其地震波放大效应的影响 ,发现当软弱层波速不大于上下围岩的 30 %时 ,就会在特定的频率上产生相当显著的地震动放大作用。研究结果表明 ,夹层放大作用的强度主要与其波速有关 ,而与密度及品质因素关系不大。研究还发现 ,这种放大作用的强度受软弱层波速与厚度之间的某种关系制约。这种关系的规律尚待通过进一步的理论分析或大量模拟研究去揭示。The effects of the elastic-plastic parameters of a buried weak layer on seismic ground motion amplification are modelled. It is found that significant amplification would occur at certain frequencies when the shear wave velocity in the weak layer is no higher than 30% of that in surrounding layers. It is found that shear wave velocity mainly affects the amplification strength of the buried weak layer, while other elastic parameters, such as density and quality factor, have no significant effects on it. It is also found that the strength is controlled by a certain relationship between the shear wave velocity and the thickness of the weak layer. Further analytical study is yet required to reveal the relationship.

关 键 词：软弱夹层 横波 放大 数值模拟 地震波 

分 类 号：P315.2[天文地球—地震学]