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Study on Geotechnical Properties of Local Soils and Economical Land Reclamation

Research Project

Project/Area Number 03302055
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field 農業土木
Research InstitutionKagoshima University

Principal Investigator

NANBA Naohiko  Kagoshima University, Agriculture, Professor, 農学部, 教授 (60041612)

Co-Investigator(Kenkyū-buntansha) SINJO Toshiya  University of Ryuku, Agriculture, Professor, 農学部, 教授 (40045109)
KUNITAKE Masato  Miyazaki University, Agriculture, Professor, 農学部, 教授 (10039323)
KOUMOTO Tatsuya  Saga University, Agriculture, Professor, 農学部, 教授 (60038304)
TAKAYAMA Masateru  Kyusyu University, Agriculture, Professor, 農学部, 教授 (60038312)
MIWA Koichi  Kagoshima University, Agriculture, Professor, 農学部, 教授 (40032099)
翁長 謙良  琉球大学, 農学部, 教授 (60045101)
藤本 昌宜 (藤本 昌宣)  佐賀大学, 農学部, 教授 (00038241)
大坪 政美  九州大学, 農学部, 助教授 (80112316)
Project Period (FY) 1991 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥11,100,000 (Direct Cost: ¥11,100,000)
Fiscal Year 1993: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1992: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1991: ¥5,200,000 (Direct Cost: ¥5,200,000)
KeywordsAriake Clay / Shirasu / Calcareous Coral Sand / Reddish Soil / Slope Stability / Cement hardening Agent / Prevention of Soil loss / Membrain of Chemical Stabilization / 浸食防止 / オンジャク / クロボク / マージ / セメント安定処理 / 土質改良 / 地盤安定 / マ-ジ
Research Abstract

Various local soils exist in Kyusyu and Okinawa, and both technical and enviromental problems occur during the land reclamation. The purpose of this project is to make the fill and dike safety, and to preserve the soil erosion under the construction. The results are summarized as follws.
1. In order to evaluate the stress and pore water pressure acting on the circular cylindrical failure surface of slope with respect to sliding, the new finite element method that complements the classical slice method was proposed, and applied for practical analysis successfuly.
2. The cement stabilization through mixing was one of the possible use for improving weak calcareous sediments in coral reef areas. The effect of cement mixing on strength and deformation behavior was significant in sand with fine passing 0.075mm sieves than those with no fine. Void cement ratio law for design of concrete mix proportion could be applied to the evaluation of strength of artifically cemented calcareous sand deposits.
3. A stabilized box foundation method for reinforcing soft ground was proposed. This new procedure was a method to make box-shaped vertical walls by overlapping cement colums in the ground on which structures were to be constructed. The loading test results of the model fondation on clay were found to agree well with the theoretical values of bearing capacity of the foundation.
4. The prevention of reddish soil loss in Kunigami Maaji area is very important in the light of enviromental conservarion of the coral reef region in Okinawa. The surface covering with a membrain made from a chemical stabilizer was a useful method to control the soil loss in a cutting surface of ground during reclamation.

Report

(4 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • 1991 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] 国武昌人: "有限要素法によるモデル斜面滑り面上の応力と安全率" 農業土木学会論文集. 153. 11-21 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 甲本達也: "軟弱地盤における箱型基礎の支持力機構" 農業土木学会論文集. 159. 53-56 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 三輪晃一: "シラス混入によるクロボク土の圧縮性の改良" 農業土木学会論文集. 161. 11-17 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 高山昌照: "セメント系固定剤による改良地盤の掘削" 農業土木学会論文集. 162. 123-129 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 新城俊也: "セメント安定処理したさんご石灰質砂の強度変形特性" 農業土木学会論文集. 166. 15-23 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 新城俊也: "高分子系被膜剤による国頭マージ地帯における赤土流出防止" 農業土木学会論文集. 166. 98-104 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Kunitake Masato: "Stress on Sliding Surface and Safety Factor of an Assumed Model Slope by the Finite Element Method" Jpn.Soc.Irri.Drai.Recla.Engi.153. 11-21 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Koumoto Tatsuya: "Bearing Capacity Mechanism of a Stabilized Box Foundation on Soft Clay" Jpn.Soc.Irri.Drai.Recla.Engi.159. 53-56 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Miwa Koichi: "Improvement of Compressibility of Kuroboku Soil by Mixing Sandy Material" Jpn.Soc.Irri.Drai.Recla.Engi.161. 11-17 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Takayama Masateru: "Excavation of Soft Ground Fortified with a Cement Hrdening Agent" Jpn.Soc.Irri.Drai.Recla.Engi.162. 123-129 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Shinjo Toshiya: "Strength and Deformation Characteristics of Artificially Cemented Calcareous Coral Sand" Jpn.Soc.Irri.Drai. Recla.Engi.166. 15-23 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Sinjo Toshiya: "Prevention of Reddish Soil Loss in the Kumigami Maaji Area by Membrane of Chemical Stabilization" Jpn.Soc.Irri.Drai.Recla.Engi.166. 98-104 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 国武,昌人: "有限要素法によるモデル斜面滑り面上の応力と安全率" 農業土木学会論文集. 153. 11-21 (1991)

    • Related Report
      1993 Annual Research Report
  • [Publications] 甲本,達也: "軟弱地盤における箱型基礎の支持力機構" 農業土木学会論文集. 159. 53-56 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] 三輪,晃一: "シラス混入によるクロボク土の圧縮性の改良" 農業土木学会論文集. 161. 11-17 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] 高山,昌照: "セメント系固定剤による改良地盤の掘削" 農業土木学会論文集. 162. 123-129 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] 新城,俊也: "セメント安定処理したさんご石灰質砂の強度変形特性" 農業土木学会論文集. 166. 15-23 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 新城,俊也: "高分子系被膜剤による国頭マージ地帯における赤土流出防止" 農業土木学会論文集. 166. 98-104 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 国武 昌人: "有限要素法によるモデル斜面滑り面上の応力と安全率" 農業土木学会論文集. 153. 11-21 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] 宮城 調勝: "石灰質砂材料による溶解の実態について" 農業土木学会論文集. 158. 1-7 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 甲本 達也: "軟曜地盤における箱型基礎の支持力機構" 農業土木学会論文集. 159. 53-56 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 三輪 晃一: "シラス混入によるクロボク土の圧縮性の改良" 農業土木学会論文集. 161. 11-17 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 宜保 清一: "沖縄島尻泥層群岩試料の残留強度と粘土粒子配向の関係" 農業土木学会論文集. 161. 19-24 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 高山 昌照: "セメント系固化剤による改良地盤の掘削" 農業土木学会論文集. 162. 123-129 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 國武 昌人: "有限要素法によるモデル斜面滑り面上の応力と安全率" 農業土木学会論文集. 153. 11-21 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 新城 俊也,宮城 調勝,小宮 康明,島袋 進: "さんご石灰質砂の力学特性" 農業土木学会誌. 58(10). 41-46 (1991)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2018-02-02  

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