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EFFECTS OF CARBONATE ON SEABED FORMATION

Research Project

Project/Area Number 04452230
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 基礎・土質工学
Research InstitutionTOKAI UNIVERSITY

Principal Investigator

FUKUE Masaharu  TOKAI UNIVERSITY,MARINE SCIENCE AND TECHNOLOGY,PROFESSOR., 海洋学部, 教授 (40119699)

Co-Investigator(Kenkyū-buntansha) KATO Yoshihisa  TOKAI UNIVERSITY,MARINE SCIENCE AND TECHNOLOGY,ASSOCIATE PROFESSOR, 海洋学部, 助教授 (00152752)
NAKAMURA Takaaki  TOKAI UNIVERSITY,MARINE SCIENCE AND TECHNOLOGY,ASSOCIATE PROFESSOR, 海洋学部, 助教授 (50056214)
Project Period (FY) 1992 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 1994: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1993: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1992: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsSeabed / Calcium carbonate / Unconfined compressive strength / Vane shear strength / Sedimentary environment / Submarine topography / Sedimentation rate / Cementation / 重金属 / 層序学 / 海底土 / サンプリング / 炭酸塩 / セメンテーション / 凝縮効果 / せん断強さ
Research Abstract

The mechanism of cementation in soils has not been well understood. The lack of information on the cementation prevents from the further progress of geotechnical engineering and better understandings of diagenesis process in geology and sedimentology. In this study, effects of carbonate on the formation of seabed, in relation to strength development, is mainly investigated. In order to find carbonate-cementation development of seabed, carbonate content, shear strength and physical properties such as water content, specific gravity, water content, void ratio, grain size distribution, etc., were measured on the samples obtained from various sites, such as Tokyo bay, Sagami bay, Suruga bay, Osaka bay, Kagoshima bay and seto inland sea. The correlations between these factors show that the cementation of seabed is mainly due to the contained carbonate. It is found that the deviation of strength with depth is mainly dependent on the variation of calcium carbonate content. Furthermore, it is found that the calcium carbonate can promote consolidation of seabed by the aggregation effects.
From the geochemical and geological points of view, the sedimentation rate of soil particles can be predicted from the calcium carbonate content. This prediction method needs an assumption that calcium carbonate precipitates on the sea bottom with a constant rate. In this study, the precipitation rate of calcium carbonate obtained is 0.95 g/cm^2/1000y. In the comparison using various methods, the prediction of sedimentation rate obtained from the carbonate method accords with those obtained from ^<14>C and key bed methods, but not from ^<210>Pb method.

Report

(4 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] 福江正治 他: "炭酸塩カルシウム含有量を考慮した土性評価" 第29回土質工学研究発表会平成6年度講演集. 209-212 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 中村隆昭 他: "炭酸含有量からみた海底堆積物の2,3の特性について" 海底地盤に関するシンポジウム'94発表論文集. 51-56 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 中村隆昭 他: "炭酸カルシウムが海底土のせん断強度に及ぼす影響(第三報)" 第30回土質工学研究発表会平成7年度講演集. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Fukue et al: "Inter-Penetration in Clay-Gravel contact" Proc.of 1995 Canadian Society for Civil Engineering Annual Conference. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Fukue: "Approach to compression law of soil" Proc.Int.Symposium on Compression and Consolidation of clayey soils,IS-Hiroshima'95. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Fukue,T.Nakamura: "Effects of Carbonate on Cementation of Marine Soils" Marine Georesources & Technology. 13. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 福江正治、加藤義久、中村隆明: "A simple method for determinig accumulation rate of marine sediments in relation to sediments pollution." Proc.Joint CSLE-ASCE National Conf,Env,Engrg.2. 1537-1544 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 中村隆昭、福江正治、直江和之: "Effects of calcium carbonate on geotechnical properties of sedinents in Tokyo Bay" Proc.3rd Int.Offshore and Polar Engineering Conf.1. 647-651 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 中村隆昭、福江正治、直江和之: "炭酸カルシウムが海底土のせん断強度に及ぼす影響" 第28回土質工学研究発表会平成5年度発表講演集. 2-1. 713-714 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 小林孝成、福江正治: "炭酸塩含有量からみた地盤のCO_2固定" 第29回土質工学研究発表会平成5年度発表講演集. 2-1. 181-182 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 福江正治、中村隆昭他: "炭酸塩含有量からみた地盤のCO_2固定" 第一回環境地盤工学シンポジウム発表論文集. (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 福江正治、中村隆昭他: "炭酸カルシウム含有量を考慮した土性評価" 第29回土質工学研究発表会平成6年度発表講演集. (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Fukue,M.,Nakamura,T.,Nagata,K.,Cheung,S.C.H.: "Cementation of marine soils due to calcium carbonate" Proceeding of Annual Conference for Canadian Society for Civil Engineering. III. 145-152 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Nakamura,T.,Fukue,M.,Naoe,K.: "Effects of calcium carbonate on geotechnical properties of sediments in Tokyo bay" Proceeding of the third International Off shore and Polar Engineering Conference. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Fukue,M.,Kato,Y.,Nakamura,T.,Naoe,K.: "A Simple method for determining accumulation rate of marine sediments in relation to sediment pollution" Proceedings of Joint CSCE-ASCE National Conference on Environmental Engineering. (1993)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2018-02-02  

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