塩類溶脱が有明粘土の圧密特性に及ぼす影響

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This paper describes the effects of salt leaching on the change in pore water salinity, physical properties and consolidation characteristics for undisturbed and remolded Ariake marine clay. The undisturbed clay specimens placed in consolidation rings were subjected to salt leaching with distilled water. The pore water salinity, pH and hydraulic conductivity during leaching were recorded, and Atterberg limits, shear strength and consolidation parameters for undisturbed and remolded specimens were determined before and after leaching. Due to reduction in pore water salinity from 10.8 to 0.01mg/L through the permeation of distilled water equivalent to 12 pore-volumes, the strength of remolded specimen exhibited marked decrease while the strength of undisturbed specimen slightly increased. This led to a dramatic increase in the sensitivity of the specimen from 10 to 594. The main clay mineral of Ariake clay is smectite, and the behaviors of the specimens mentioned above were explained in terms of the low swelling nature of the smectite. Salt leaching reduced both the consolidation yield stress and compression index of the undisturbed specimen. The hydraulic conductivity of undisturbed specimen was decreased by 60% by salt leaching, which led to a reduction in the consolidation coefficient of the specimen by about 50%. Decreases in the consolidation yield stress, compression index and hydraulic conductivity due to salt leaching was attributed to the change in particle orientation from flocculated to orientated structure under a given consolidation pressure.
日本粘土学会の論文
2008-08-12

塩類溶脱が有明粘土の圧密特性に及ぼす影響

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