Frequency-Dependent Amplification of Unsaturated Surface Soil Layer
Frequency-Dependent Amplification of Unsaturated Surface Soil Layer
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DOI：
10.1061/(asce)1090-0241(2006)132:4(526
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发表时间：
2006-04
影响因子：
3.9
通讯作者：
Jun Yang
中科院分区：
文献类型：
--
作者：
Jun Yang
本文介绍了倾斜入射到岩层上的表土层上的 SV 波放大的研究。特别关注土层和基岩的饱和状态对水平和垂直方向放大以及地表两个方向之间的振幅比的影响，其中垂直和水平放大以及振幅比表示为入射波频率的函数。分析表明，虽然基岩饱和状态的影响不大，但土层饱和状态的变化可能对垂直放大产生显着影响。对于典型的地震频率，非饱和土层可以比饱和土层产生更大的垂直放大；它还会导致表面垂直和水平分量之间的振幅比更大。该分析进一步证实了近地表土壤饱和条件在场地响应分析中的潜在重要性。
This paper presents a study of the amplification of SV waves obliquely incident on a surface soil layer overlying rock formation. Special attention is placed on the influence of the saturation states of the soil layer and the bedrock on the amplification in both horizontal and vertical directions as well as on the amplitude ratios between the two directions at the surface, where the vertical and horizontal amplification and the amplitude ratios are expressed as functions of the frequency of incident waves. The analysis indicates that while the influence of the saturation state of the bedrock is insignificant, a change of the saturation state of the soil layer may have a marked impact on the vertical amplification. For typical seismic frequencies, an unsaturated soil layer can generate greater vertical amplification than a saturated layer; it can also cause larger amplitude ratios between vertical and horizontal components at the surface. The analysis further confirms the potential importance of the saturation condition of near-surface soils in site response analysis.