Sensitivity of Salt-leached Clay Sediments in the Ariake Bay Area, Japan

Phanny He, Masami Ohtsubo, Takahiro Higashi, Motohei Kanayama

研究成果: ジャーナルへの寄稿学術誌査読

6 被引用数 (Scopus)


This study aims to determine whether the principle that “divalent cation predominance in the pore water precludes quick clay development” applies to the Ariake Bay sediments. The chemical and geotechnical properties of an Ariake clay sediment are presented, and sensitivity is discussed with a focus on pore-water salinity and cation composition. In recent years, reduction of pore-water salinity has occurred due to permeation of river water through the sediments because of overpumping of groundwater. Sodium remains the dominant pore-water cation in an upper zone, whereas divalent cations are dominant in the deeper zone. Divalent cation domination in the deeper zone is ascribed to Ca release from nearby cement-stabilized sediments and to Mg increase in response to a change in river water quality. The upper zone's sensitivity ranged from 15 to 77, and the remolded strength was mostly <0.5 kPa, such that quick clay was present over much of its depth. In contrast, the deeper zone's sensitivity was <40, and its remolded strength exceeded 0.5 kPa; quick clay was not present despite the <2 g/L salinity. The absence of quick clay is ascribed to the high remolded strength caused by the pore-water divalent to monovalent cation ratio being greater than 0.25.

ジャーナルMarine Georesources and Geotechnology
出版ステータス出版済み - 9月 3 2015

!!!All Science Journal Classification (ASJC) codes

  • 海洋学
  • 地盤工学および土木地質学
  • 海洋工学


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