Consolidation characteristics and permeabilities of sediments from the Japan Sea@en

The results of laboratory consolidation tests and undrained shear strength determinations of sediments from the Oki Ridge and the Kita Yamato Trough show that the sediments are overconsolidated to normally consolidated to a depth of about 20 m below the seafloor. Below that depth, the sediments are highly underconsolidated, implying high excess pore-water pressures. The most probable mechanism for the generation of the excess pore-water pressure is gas in sediments.针对取自隐岐海脊(Oki Ridge)与北大和海槽(Kita Yamato Trough)的沉积物开展的实验室固结试验与不排水抗剪强度测定结果显示：在海底以下约20米的深度范围内，沉积物呈现从超固结到正常固结的状态；该深度以下的沉积物则处于严重欠固结状态，这表明其存在较高的超孔隙水压力。引发此类超孔隙水压力的最可能机制为沉积物内部赋存气体。