せん断を受ける地盤の局所的変形の3次元的発達

3-dimensional propagation of localized deformation in foundation under shear

西原 照雅 (Terumasa NISHIHARA)

When a strike-slip occurs, the base rock itself slides uniformly, but on the ground surface so-called echelon faults, which are periodical oblique faults, emerge. In order to examine such characteristics of propagation of faults in foudation, 3D-FEM analysis is carried out. Damage in foundation is expressed by void damage theory. Various models are analyzed in order to investigate change of the echelon pattern in uenced by intervals of such faults and the thickness and damage of the foundation

本研究ではボイド損傷理論を用いて雁行断層を数値シュミレーションしたが,既存の実験や数値解析と同様の傾向が得られ,ボイド損傷理論の地震断層への適用性を示した.また,解析領域を変えたモデルをいくつか解析することにより変形が広がる領域や堆積層の厚さによる雁行パターンの変化,雁行パターンの周期に関して定量的な結果を得た.



back