SH波斜入射下河谷场地非一致地震动特性及影响因素分析

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (23) : 109-118.

论文

赵磊超1，宋志强1,王飞1，刘云贺1，张存慧2

作者信息 +

Non-uniform ground motion characteristics and influencing factors of valley site under oblique incidence of SH wave

ZHAO Leichao1, SONG Zhiqiang1, WANG Fei1, LIU Yunhe1, ZHANG Cunhui2

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文章历史 +

摘要

基于间接边界积分方程法（IBIEM），分析了SH波入射下梯形河谷表面地震动特性和分布规律，研究了地震波斜入射角度、斜坡坡度、底宽以及场地剪切波速对场地地震动特性及非一致分布规律的影响机制，深入分析了不同剪切波速下河谷散射效应对地基截断边界地震动场的影响规律。结果表明，随着左侧斜入射角的增大，左侧斜坡放大效应逐渐增强，两岸地震动非一致分布特性越趋明显。左侧斜入射地震波，随着斜坡变缓，地形散射效应引起的放大区域逐渐向右扩展，两岸坡顶及坡脚地震动非一致性增强；随着底宽的增大，地形散射效应引起的放大区域逐渐由右扩展，坡脚相对位移对底宽变化敏感，两岸坡脚地震动非一致性增强；波速较小情况下，河谷散射效应显著，左侧坡顶位移峰值最大为右侧坡顶的1.45倍，两岸地震动非一致性明显。在截断边界输入地震动时，应充分考虑河谷地形散射效应，将自由场和散射场组成的总场作为输入，以获得合理准确的地震动输入。
关键词：IBIEM；河谷地形；SH波；非一致特性；散射效应；

Abstract

Based on the indirect boundary integral equation method (IBIEM), the characteristics and distribution of ground motion on the surface of trapezoidal canyon under SH wave incidence were analyzed, and the influence mechanism of seismic wave oblique incidence Angle, slope slope, base width and site shear wave velocity on ground motion characteristics and non-uniform distribution was studied.The effect of canyon scattering on ground motion field at the truncated boundary of foundation under different shear wave velocities is deeply analyzed. The results show that with the increase of the angle of incidence, the amplification effect of the left slope increases gradually, and the more obvious the non-uniform distribution of ground motion on both sides of the bank. As the slope slows down, the amplification area caused by terrain scattering effect gradually expands to the right, and the seismic non-uniformity at the top and toe of the slope on both banks increases; With the increase of bottom width, the amplification area caused by terrain scattering effect gradually expands from right to side, the relative displacement of slope toe is sensitive to the change of bottom width, and the non-uniform characteristics of ground motion at both sides of slope toe are enhanced; When the wave velocity is small, the scattering effect of canyon is significant, and the maximum displacement of the left slope top is 1.45 times that of the right slope top, and the non-uniform characteristics of ground motion between the two banks is obvious. When truncating boundary input ground motion, the scattering effect of canyon topography should be fully considered, and the total field composed of free field and scattered field should be taken as the input to obtain reasonable and accurate ground motion input. •••••••
Key words: IBIEM; canyon topography; SH wave; non-uniform characteristic; Scattering effect

导出引用

赵磊超1，宋志强1,王飞1，刘云贺1，张存慧2. SH波斜入射下河谷场地非一致地震动特性及影响因素分析[J]. 振动与冲击, 2022, 41(23): 109-118

ZHAO Leichao1, SONG Zhiqiang1, WANG Fei1, LIU Yunhe1, ZHANG Cunhui2. Non-uniform ground motion characteristics and influencing factors of valley site under oblique incidence of SH wave[J]. Journal of Vibration and Shock, 2022, 41(23): 109-118

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