海底表層堆積物を対象とした酵素触媒法による底泥の巻き上がり抑制技術の適用性評価  [in Japanese] EVALUATION OF APPLICABILITY OF BOTTOM MUD CURLING SUPPRESSION TECHNOLOGY BY ENZYME CATALYTIC METHOD FOR SEAFLOOR SEDIMENT  [in Japanese]

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Abstract

これまでに,チュニジア国のイシュケウル湖を対象とした試験結果から,原位置微生物由来の酵素と天然由来の固化試薬を用いた表層固化から表層堆積物の再懸濁抑制効果が明らかとなっている.本研究では,この技術の適用範囲拡大を目的に,酵素そのものを用いることで施工期間の短縮効果を期待することとした.対象として国内表層堆積物を選定し,提案技術の有効性検証を目的として短期・長期で固化効果を得ることを目的とした2種類の室内試験を実施した.試験の結果より,国内表層堆積物と酵素製剤を用いた場合においても濁度抑制効果が期待できることが明らかとなった.また,底泥表層に析出したカルサイトの膜厚と強度に正の相関があることと,X線CT撮影の結果から析出したカルサイト膜と底泥の間に隙間が生成されることなどが明らかとなった.

 It is a problem that sediment flows out by rolling up the bottom mud. Based on the results of previous studies, the effectiveness of superficial solidification technology using enzymes derived from microbial functions has been clarified from the study of Lake Ichkeul in Tunisia. Therefore, in this research, for the purpose of evaluating the applicability of this technology to domestic and shortening the construction period, we examined the effectiveness of the proposed technology by the enzyme catalytic method for domestic surface sediments. In the test, two cases of specimens for long-term construction and short-term construction were prepared. According to the results of the test, it became clear that turbidity suppression by enzyme catalytic method for domestic sediments is possible. In addition, CT imaging revealed that as the thickness of the calcite membrane deposited on the surface layer of the sediment became thicker, the surface strength increased and gaps were formed between the calcite and the bottom mud.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 74(2), I_270-I_275, 2018

    Japan Society of Civil Engineers

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