P,SV波斜入射下凹陷地形地震动分布特征

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摘要本文采用数值模拟方法，探讨了凹陷地形在P波和SV波斜入射下，入射角度θ和凹陷深宽比H/L等参数的变化对地表地震动峰值放大系数β的影响，得到如下结论：（1）峰值放大系数的影响程度和范围受不同地震波的影响较大。（2）凹陷两侧的放大系数比底部大，凹陷两侧顶点的放大系数比两侧地表的大。（3）凹陷深宽比一定，SV波从左边斜入射，放大系数随入射角的增大而增大，x分量的放大系数大于z分量，左顶点放大系数大于右顶点。对于P波，x分量的放大系数小于2，放大系数随着入射角的增大而增大；凹陷两侧顶点的z分量放大系数大于2，放大系数随着入射角的增大而减小。（4）入射角θ不变，无论是SV波还是P波，左右两侧的放大系数随凹陷深宽比H/L的增大而增大。当SV波从左边斜入射时，x分量左顶点的放大系数大于右顶点，z分量放大系数小于x分量。当P波从左边斜入射时，左顶点x分量放大系数大于右顶点，所有放大系数均小于2，z分量放大系数大于x分量。

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	丁海平
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	朱重洋1
	于彦彦2

关键词 ：凹陷地形；P, SV波斜入射；地面运动；放大系数

Abstract：Seismic ground motion of a canyon topography under left inclined incident P and SV waves is analyzed using numerical simulation method, and effects of the incident angleθ and the aspect ratio (ratio of the canyon depth and width) on the ground motion amplification factor β of the surface are also discussed. It is showed that: (1) The influence degree and range of theβare strongly related to the incident waves. (2) βof the canyon's side are generally larger than the bottom, andβof the side corner is larger than the top surface. (3) For fixed aspect ratio and SV wave incidence, the amplification factor increases with the increase of incident angle, and β of the x component is greater than the z component. Besides, β of left side corner is larger than the right. For P wave incidence, βof the x component is less than 2, and β is also increases with the incident angle. The z component amplification factors at the two side corners of the canyon exceed 2, and β decreases with the increase of θ. (4) For fixed θ, no matter of SV and P wave incidence, β of the canyon's two sides increases with the increase of aspect ratio. For SV wave incidence, β of the x component at the left side corner is greater than the right ones, and β of the z component is less than the x. For P wave incidence, β of the x component at the left side corner is also greater than the right ones, withβ at any positions less than 2, andβ of the z component is larger than the x component.

Key words： canyon topography inclined P and SV wave ground motion amplification factor

收稿日期: 2016-02-24 出版日期: 2017-06-15

引用本文:

丁海平,2，朱重洋1，于彦彦2. P,SV波斜入射下凹陷地形地震动分布特征[J]. 振动与冲击, 2017, 36(12): 88-92.
DING Hai-ping 1,2, ZHU Chong-yang 1, YU Yan-yan 2, . Characteristic of ground motions of canyon topography under inclined P and SV waves. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(12): 88-92.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2017/V36/I12/88

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