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Simulating lifetime of embankments : from construction process to deformation and failure due to heavy rain / earthquake

Research Project

Project/Area Number 16H06099
Research Category

Grant-in-Aid for Young Scientists (A)

Allocation TypeSingle-year Grants
Research Field Geotechnical engineering
Research InstitutionYokohama National University

Principal Investigator

KIKUMOTO MAMORU  横浜国立大学, 大学院都市イノベーション研究院, 准教授 (90508342)

Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥24,570,000 (Direct Cost: ¥18,900,000、Indirect Cost: ¥5,670,000)
Fiscal Year 2018: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2017: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
Fiscal Year 2016: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Keywords土構造物 / 締固め / 浸水崩壊 / 液状化 / 構成則 / 限界状態 / 状態境界面 / シミュレーション / 不飽和土 / 締固め土 / 繰り返しせん断 / 浸水 / 変形・破壊 / 数値計算 / 要素試験 / 盛土 / 地震 / 降雨 / 浸水コラプス / 三軸圧縮試験 / 構成モデル / 水分特性曲線 / 応答曲面 / 数値解析 / 繰返しせん断 / 破壊 / 弾塑性構成則 / 多相連成解析 / 非排気非排水繰返しせん断 / ボイルの法則 / 動的挙動 / 有限変形論
Outline of Final Research Achievements

The conventional deformation and failure analysis of the embankment require the compacted soil's physical properties after the construction. However, the embankment parameters are set arbitrary, and the mechanical stability of the embankment could not be adequately evaluated. Thus, this research project aimed to develop a rational simulation method which incorporates the embankment's whole life from the construction (compaction) process to the deformation and failure due to rainfall or earthquake. The model is based on a critical state model and extended for unsaturated soils using Bishop's effective stress, rational soil-water characteristic curve, and extended state boundary surface. It is shown that the proposed model could reproduce the mechanism of the compaction, including upper-convex compaction curve and its transition due to the increase in the compaction energy. The model could also predict the behavior of compacted soils such as wetting-induced deformation.

Academic Significance and Societal Importance of the Research Achievements

土構造物の力学的安定性は、含水比や締固めエネルギーといった締固め品質に大きく影響を受ける。しかし、従来は築造後の土構造物に対して恣意的にパラメータを設定して安定性評価が行われてきた。本研究では、土構造物の締固め築造過程から、降雨による浸水崩壊や地震時の液状化まで一貫してシミュレートできる手法が実現された。この手法を用いれば、築造過程から変形・破壊まで土構造物の一生をシミュレートする地盤解析技術が確立された。ここで開発された解析技術をさらに地盤材料の風化・侵食現象に拡張することで、長期供用期間を経た土構造物の安定性をより精緻に予測できるものと考えられる。

Report

(4 results)
  • 2019 Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (20 results)

All 2019 2017 2016 Other

All Int'l Joint Research (10 results) Journal Article (3 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 5 results) Remarks (2 results)

  • [Int'l Joint Research] University of New South Wales(オーストリア)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] University of Dundee(英国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] University of Lampung(インドネシア)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Chulalongkorn University(タイ)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Chulalongkorn university(Thailand)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] University of Dundee(United Kingdom)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] University of New South Wales(Australia)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] Chulalongkorn University(Thailand)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] Dundee University(United Kingdom)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research]

    • Related Report
      2016 Annual Research Report
  • [Journal Article] Simulation of liquefaction of unsaturated soil using critical state soil model2017

    • Author(s)
      Komolvilas, V. and Kikumoto, M.
    • Journal Title

      International Journal for Numerical and Analytical Methods in Geomechanics

      Volume: 41(10) Issue: 10 Pages: 1217-1246

    • DOI

      10.1002/nag.2669

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Fully undrained cyclic loading simulation on unsaturated soils using an elastoplastic model for unsaturated soils2016

    • Author(s)
      Komolvilas, V. and Kikumoto, M.
    • Journal Title

      Proc. of the 3rd European Conf. on unsaturated soils (E-UNSAT 2016)

      Volume: 9 Pages: 17008-17008

    • DOI

      10.1051/e3sconf/20160917008

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A finite strain elastoplastic constitutive model for unsaturated soils incorporating mechanisms of compaction and hydraulic collapse2016

    • Author(s)
      Nakamura, K. and Kikumoto, M.
    • Journal Title

      Proc. of the 3rd European Conf. on unsaturated soils (E-UNSAT 2016)

      Volume: 9 Pages: 17001-17001

    • DOI

      10.1051/e3sconf/20160917001

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Simulation on liquefaction of unsaturated compacted soils -effect of compaction degree-2019

    • Author(s)
      Chortham, S., Kikumoto, M. and Komolvilas, V.
    • Organizer
      7th lnt. Conf. on Earthquake Geotech. Engrg.
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Theory of loosening earth pressure on a shallow tunnel in unsaturated ground2019

    • Author(s)
      Fang, X., Kikumoto, M. and Cui, Y.
    • Organizer
      3rd ATC6 Sym.
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Weathering-induced deformation of crushed weak rocks and its countermeasure2019

    • Author(s)
      Putra, A. D., Takahashi, M. and Kikumoto, M.
    • Organizer
      7th Int. Sym. on Deformation Characteristics of Geomaterials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Simulation of Soaking-Induced Collapse of Unsaturated Soil2017

    • Author(s)
      Komolvilas, V. and Kikumoto, M.
    • Organizer
      30th KKHTCNN Symposium on Civil Engineering
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A series of fully undrained cyclic loading simulation on unsaturated soils using an elastoplastic model for unsaturated soils2017

    • Author(s)
      Komolvilas, V. and Kikumoto, M.
    • Organizer
      19th International Conf. on Soil Mechanics and Geotechnical Engineering
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Remarks] Geomechanics laboratory at YNU

    • URL

      http://www.cvg.ynu.ac.jp/G3/MamoruKikumoto/index.html

    • Related Report
      2017 Annual Research Report
  • [Remarks] Geomechanics group at YNU

    • URL

      http://www.cvg.ynu.ac.jp/G3/MamoruKikumoto/index.html

    • Related Report
      2016 Annual Research Report

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Published: 2016-04-21   Modified: 2021-02-19  

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