| 講演要旨(和文) | | 地表面に鉛直方向の調和振動荷重を作用させ、地表面の振動振幅特性と波動の位相速度の計測から、埋設管等のように周辺地盤よりも硬い埋設物の深さを推定する方法を確立することを目的とし、数値計算により地盤振動振幅特性と波動の位相特性、硬い層の深さの間の相関関係を調べた。数値計算には、剛性マトリックスによる水平成層地盤の波動場解析法を用いた。その結果、水平成層地盤内に周辺地盤よりも硬い層が存在する場合と存在しない場合の比較から、地表面の振動振幅特性と波動の位相特性には違いが現れ、これらの情報から埋設物の深さの推定が可能であることを示した。 |
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| | 講演要旨(英文) | | In order to establish a harmonic wave method to estimate the depth of the buried long extended structures such as embedded pipelines, this paper has examined some of the basic relationships between the depth of the relatively harder soil thin layer and the characteristics of the P-SV wave propagation in layered media and their dynamic response due to the vertical harmonic point load applied on the ground surface. In this examination, the P-SV wave field has been simulated by the stiffness matrix method of wave motions in soil layered media. It has been found from this numerical investigation that the depth of the relatively harder soil thin layer can be estimated from the information of the change of the phase velocity on ground surface at the resonant frequency of the soil layer. |
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