覆盖层、双凹陷地形和入射角对SV波的影响  

Effects of Cover, Two Canyons and Incidence Angle on SV Wave

作　　者：方浩 FANG Hao(College of Civil Engineering/Suzhou University of Science and Technology,Suzhou 215011,China)

机构地区：[1]苏州科技大学土木工程学院

出　　处：《山东农业大学学报（自然科学版）》2019年第6期1010-1013,共4页Journal of Shandong Agricultural University：Natural Science Edition

摘　　要：基于有覆盖层双凹陷模型,本文利用有限元法,通过对比不同模型下观测点的放大系数,探究了覆盖层厚度,双凹陷间距以及入射角对SV波的影响。结果表明:(1)覆盖层的存在对地震动有很强的放大作用;(2)入射波入射角度越大,两凹陷之间地表点位移放大效果越平缓;(3)凹陷间距的变化仅对两凹陷之间的地表点的放大系数有影响,凹陷间距越小,两凹陷之间的地表点的放大系数越大,节点的位移幅值越大;(4)当入射波从模型左下方斜入射时,凹陷间距越大,凹陷之间地表的左侧角点的水平放大系数越小,右侧角点的水平放大系数越大,但是对竖向放大系数的大小没有影响。Based on the double-depression model with layers,the influence of the thickness of layers,the distance between two depressions and the incident angle on the seismic response is studied by comparing the magnification coefficients of observation points under different models with the finite element method.The results show that:(1)The existence of the cover layer has an amplification effect on the movement of all points on the site;(2)The larger the incident angle of the pulse wave is,the smoother the displacement effects of the surface point displacement are;(3)The variation of the groove spacing has a great influence on the magnification factor of the ground point between the two depressions.The smaller the gap spacing is,the larger the magnification factor of the ground point between the two depressions is;(4)When the SV wave is obliquely incident from the lower left of the model,the larger the concave spacing is,the smaller the horizontal magnification factor of the left corner of the surface between the depressions is,and the larger the horizontal magnification factor of the right corner is,but the spacing of the depressions Size has no effect on the vertical magnification factor.

关 键 词：覆盖层 双凹陷地形 入射角 SV波 

分 类 号：P315.9[天文地球—地震学]