日本語フィールド
著者：柴 錦春・三浦哲彦・Bergado D. T. 読み: チャイジンチュン ミウラノリヒコ ベルガート題名：キャンプドレーンを用いる粘性土地盤の真空圧密について、解析と実際の挙動発表情報：ジオテキスタイルとジオメンブレン 巻: 26 号: 3 ページ: 220-230キーワード：真空圧密、バーチカルドレーン、地盤変形、埋立地概要：A method of improving soft clayey deposit by combining Cap-drain (CPVD) with vacuum pressure is described. The method uses a surface or subsurface soil layer as a sealing layer and no need to place an air-tightening sheet on ground surface. It is explained that the method has advantages for situations of (a) a higher air/water permeability layer existed at ground surface, and (b) combing vacuum pressure with embankment load. A case history of consolidating a reclaimed clayey deposit by combining CPVD with vacuum pressure is analyzed and discussed. The site was in an under-consolidated state before starting the project. It is shown that the method is effective, and the method proposed by Chai et al. (2005b) for calculating the vacuum pressure induced ground deformation is useful for design vacuum consolidation project. The back-calculation shows that for this under-consolidated deposit, vacuum pressure caused plane strain type isotropic deformation at near the ground surface.抄録：A method of improving soft clayey deposit by combining Cap-drain (CPVD) with vacuum pressure is described. The method uses a surface or subsurface soil layer as a sealing layer and no need to place an air-tightening sheet on ground surface. It is explained that the method has advantages for situations of (a) a higher air/water permeability layer existed at ground surface, and (b) combing vacuum pressure with embankment load. A case history of consolidating a reclaimed clayey deposit by combining CPVD with vacuum pressure is analyzed and discussed. The site was in an under-consolidated state before starting the project. It is shown that the method is effective, and the method proposed by Chai et al. (2005b) for calculating the vacuum pressure induced ground deformation is useful for design vacuum consolidation project. The back-calculation shows that for this under-consolidated deposit, vacuum pressure caused plane strain type isotropic deformation at near the ground surface.英語フィールド
Author：Chai, J.-C., Miura, N. and Bergado, D. T. (2008).Title：Preloading clayey deposit by vacuum pressure with cap-drain: Analyses versus performanceAnnouncement information:Geotextiles and Geomembranes Vol: 26 Issue: 3 Page: 220-230Keyword：Vacuum consolidation, vertical drain, ground deformation, reclaimed landAn abstract：A method of improving soft clayey deposit by combining Cap-drain (CPVD) with vacuum pressure is described. The method uses a surface or subsurface soil layer as a sealing layer and no need to place an air-tightening sheet on ground surface. It is explained that the method has advantages for situations of (a) a higher air/water permeability layer existed at ground surface, and (b) combing vacuum pressure with embankment load. A case history of consolidating a reclaimed clayey deposit by combining CPVD with vacuum pressure is analyzed and discussed. The site was in an under-consolidated state before starting the project. It is shown that the method is effective, and the method proposed by Chai et al. (2005b) for calculating the vacuum pressure induced ground deformation is useful for design vacuum consolidation project. The back-calculation shows that for this under-consolidated deposit, vacuum pressure caused plane strain type isotropic deformation at near the ground surface.An abstract：A method of improving soft clayey deposit by combining Cap-drain (CPVD) with vacuum pressure is described. The method uses a surface or subsurface soil layer as a sealing layer and no need to place an air-tightening sheet on ground surface. It is explained that the method has advantages for situations of (a) a higher air/water permeability layer existed at ground surface, and (b) combing vacuum pressure with embankment load. A case history of consolidating a reclaimed clayey deposit by combining CPVD with vacuum pressure is analyzed and discussed. The site was in an under-consolidated state before starting the project. It is shown that the method is effective, and the method proposed by Chai et al. (2005b) for calculating the vacuum pressure induced ground deformation is useful for design vacuum consolidation project. The back-calculation shows that for this under-consolidated deposit, vacuum pressure caused plane strain type isotropic deformation at near the ground surface.