日本語フィールド
著者：Ong, C. Y., 柴 錦春、日野剛徳 読み: Ong, C. Y.,チャイ ジンチュン、ヒノ タケノリ題名：
不貫通バーチカルドレーンによる改良した軟弱地盤の圧密度発表情報：ジオテキスタイルとジオメンブレー 巻: 34 ページ: 19-27キーワード：
地盤改良、ドレーン、圧密度概要：抄録：A simple approximate method for calculating the average degrees of consolidation of subsoil with partially penetrated prefabricated vertical drains (PVDs) under instantaneous load has been developed. The basic ideas adopted are: for the layer with PVDs, the average degree of consolidation (U1) can be calculated by the combination of the unit cell consolidation theory for radial drainage due to PVD and the Terzaghi’s one-dimensional (1D) consolidation theory for vertical drainage of natural soil, and for the unimproved layer, the average degree of consolidation (U2) can be calculated by Terzaghi’s 1D consolidation theory and multiplied by an empirical factor (2). 2 is a function of U1, spacing of PVDs and the ratio of the horizontal hydraulic conductivities of natural soil (kh) and smear zone (ks). The empirical equations for calculating 2 are proposed based on the results of finite element analyses with an axisymmetric unit cell model. The validity of the proposed method has been confirmed by comparing the calculated results with the results of finite element analyses as well as other existing solutions.英語フィールド
Author：Ong, C. Y., Chai, J.-C., Hino, T.Title：
Degree of consolidation of clayey deposits with partially penetrated vertical drainsAnnouncement information:Geotextiles and Geomemberanes Vol: 34 Page: 19-27Keyword：
Ground Improvement, drain, degree of consolidationAn abstract：A simple approximate method for calculating the average degrees of consolidation of subsoil with partially penetrated prefabricated vertical drains (PVDs) under instantaneous load has been developed. The basic ideas adopted are: for the layer with PVDs, the average degree of consolidation (U1) can be calculated by the combination of the unit cell consolidation theory for radial drainage due to PVD and the Terzaghi’s one-dimensional (1D) consolidation theory for vertical drainage of natural soil, and for the unimproved layer, the average degree of consolidation (U2) can be calculated by Terzaghi’s 1D consolidation theory and multiplied by an empirical factor (2). 2 is a function of U1, spacing of PVDs and the ratio of the horizontal hydraulic conductivities of natural soil (kh) and smear zone (ks). The empirical equations for calculating 2 are proposed based on the results of finite element analyses with an axisymmetric unit cell model. The validity of the proposed method has been confirmed by comparing the calculated results with the results of finite element analyses as well as other existing solutions.