大阪湾洪積粘土の時間依存性挙動の数値解析による評価について

Abstract

過圧密領域においても洪積粘土の時間俵存性挙動が発生すると仮定した新たな圧縮モデルを提案し，長期圧密試験結果と大阪港舞洲洪積粘土地盤の沈下現象を弾粘塑性有限要素法によって解析した。その結果，過圧密領域でも正規圧密粘土と同様，時間の経過とともに圧縮が生じることになり，室内長期圧密試験結果，および従来モデルでは過小評価した大阪港舞洲埋立地下部洪積粘土層の沈下量を，精度良く表現できることがわかった。

The most difficult problem is that a delayed compression of Pleistocene clayscontinues even when the total overburden remains less than pc. A new procedure isintroduced to describe the delayed compression of the Pleistocene clays. A series ofnumerical analyses in terms of the elasto-viscoplastic finite element method is conducted tosimulate those time-dependent behaviors. Furthermore, the procedure is also applied to thelong-term deformation that has been monitored at the Maishima Reclaimed Island in OsakaBay. The calculated results can also well describe the monitored long-term settlement of theeach Pleistocene marine clay layers.