| 講演要旨(和文) | | 本報では、3次元的な地形・地盤構造が波動伝播に与える影響を検討した。本検討では2次元的な斜面地盤に直交する小谷を有するモデルに対し、表面波(レイリー波およびラブ波)および実体波(S波)を入射する。解析方法は3次元有限要素法、2.5次元有限要素法および2.5次元薄層要素法の結合解析を採用した。解析の結果、3次元的な地形・地盤構造により、波動場は複雑となることがわかった。また、不整形性の存在により、H/Vスペクトル、推定位相速度およびS波の増幅特性が影響を受けることがわかった。 |
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| | 講演要旨(英文) | | The objective of this study is to investigate the effect of 3-D configuration of the ground from the viewpoint of elastic wave propagation. In the study, analysis model is 2-D slope ground with a small canyon that penetrates perpendicularly into the upper part of the ground subject to incident surface waves (Rayleigh and Love) and S-wave. The analysis method is a combination of 3-D finite element and 2.5-D thin layered and finite element methods in conjunction with substructure technique. It was found from the result that the wave field becomes very complex when there is a small canyon that penetrates into the upland through the slope. It has also revealed that the frequency characteristics such as H/V spectra, estimated phase velocities and amplification factors are significantly influenced by the irregularity. |
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