Ariake bay quick clays: a comparison with the general model.

ABSTRACT The factors essential to the development of quick clay in the soft marine sediments of Ariake Bay are the same as those for the Scandinavian and Canadian quick clays. These similarities are: sedimentation in marine or brackish water, with resultant development of a flocculated microstructure; domination of the soil material by low-activity minerals; and the decrease of the liquid limit of the Na-saturated soil material as the salinity of the pore water decreases. The above factors are essential for quick clay development in both materials. Differences include: the origin of the material—glacial rock flour in Scandinavia and Canada, eroded soil containing some volcanic ash at Ariake; the mineralogy—primary minerals, illite and chlorite in Scandinavia and Canada, a low-swelling, high-iron, beidellitic smectite at Ariake. The difference in origin of minerals is unimportant as long as the dominant minerals are of low activity, and the environment of deposition assured a flocculated structure in the sediment. The upper limit of activity which allows quick clay development upon salt removal, is on the order of 1 for the low-salinity, Na-saturated soil material.

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