EXPERIMENTAL STUDY ON THE GENERATION OF TURBIDITY ASSOCIATED WITH THE APPLICATION OF CALCIA MODIFIED SOIL TO SEA AREAS

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  • SUTO Akira
    一般財団法人みなと総合研究財団 調査研究部
  • AJIKI Kunihiro
    国土交通省中国地方整備局広島港湾空港技術調査事務所
  • NISHIMOTO Takashi
    国土交通省中国地方整備局広島港湾空港技術調査事務所
  • HAYASHI Ririka
    国土交通省中国地方整備局広島港湾空港技術調査事務所
  • NISHIJIMA Wataru
    広島大学学術院 環境安全センター
  • TERADA Kunio
    一般財団法人みなと総合研究財団 調査研究部
  • OKAWA Ikuo
    （株）東京久栄 環境ソリューション部

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Other Title
  • カルシア改質土の海域投入に伴う濁りの発生に関する実験的研究

Abstract

<p> The applicability of the modified calcia soil to the environmental restoration of a former sea gravel extraction site was investigated. However, there is no quantitative evaluation of the turbidity of the modified soil, and conventional construction methods are difficult because the target area is deep and has high velocity currents.</p><p> The strength characteristics of the modified soil were analyzed based on the results of mixing tests, and the effective free lime rate, Le, was used to evaluate the early onset of strength based on the 24-hour curing data. The turbidity generation intensity was calculated based on hydraulic model experiments, and a vane shear force of 2 kN/m2 was set as the strength that can suppress turbidity. Furthermore, we analyzed the results for an arbitrary curing time and proposed a method of preparing the modified soil according to the conditions at the time of on-site construction. These results indicate that the modified soil can be applied by bottom-opening barges.</p>

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