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Clarification of Reinforcement Effects and Limitations of Vegetation Works in Cold Regions

Research Project

Project/Area Number 19K04591
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 22030:Geotechnical engineering-related
Research InstitutionKitami Institute of Technology

Principal Investigator

NAKAMURA Dai  北見工業大学, 工学部, 准教授 (90301978)

Co-Investigator(Kenkyū-buntansha) 川口 貴之  北見工業大学, 工学部, 教授 (20310964)
川尻 峻三  北見工業大学, 工学部, 准教授 (80621680)
宗岡 寿美  帯広畜産大学, 畜産学部, 教授 (50301974)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords緑化工学 / 植生工 / 植物根系 / 補強効果 / 風化抑制効果 / せん断抵抗 / 侵食抵抗 / 凍結融解 / 豪雨 / 表層崩壊 / 侵食 / 風化 / 降雨浸透 / 地域性種苗 / 豪雨災害 / 寒冷地
Outline of Research at the Start

近年,ゲリラ豪雨や台風に伴う集中豪雨で,のり面崩壊や堤防の決壊といった災害が多発している。降雨から土構造物を保護するため,北海道では自然環境に配慮できる植生工が採用されてきた。しかしながら,現在の植生工は豪雨を想定した設計・施工となっておらず,今後の気候変動に対応できていない。そこで本研究では,植生工に期待される3つの補強効果(①表層崩壊の抑制効果,②雨水による侵食防止効果,③切土のり面の風化抑制効果)について,各種の室内試験や実物大実験,原位置計測で,網羅的に解明することに取り組む。補強効果については植物根系の発達状況との関係で評価し,凍結融解の影響についても検討を行う。

Outline of Final Research Achievements

In this study, we attempted to clarify the three reinforcement effects expected from vegetation works (i.e., prevention of surface failure, prevention of erosion by rainwater, and prevention of weathering of the cut slope).
Constant-pressure one-surface shear tests revealed that the shear resistance increased with a specimen with a well-developed root system. It was also found that the effect of freeze-thaw history on shear strength was small. Furthermore, the erosion resistance tests revealed that the erosion resistance was increased by the root system, stems and leaves of the plants, and that the erosion depth was decreased. However, erosion resistance was found to be reduced by freeze-thaw history. Finally, in-situ measurements indicated that the vegetation works had little effect on the weathering of cut slopes in areas with little snowfall and cold temperatures.

Academic Significance and Societal Importance of the Research Achievements

植生工の効果や機能を定量的に評価する手法は確立されておらず,特に草本植物については,植物の種類や成長の度合いといった要素で評価された調査データや研究成果は極端に少ない。本研究では植生工の補強効果について,植物根系の発達状況との関係から評価することに取り組んだ。加えて,凍結融解履歴が植生工に与える影響についても検討を行った。このような研究事例は国内外に関わらず存在しておらず,他に類を見ない。
また,植生工に期待される3つの補強効果を網羅的に解明した研究事例は皆無であり,本研究で得られた成果は将来的に道路土工指針や河川堤防設計指針に反映され,周辺地域の地盤・河川防災に貢献できると考えられる。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (14 results)

All 2022 2021 2020 2019

All Journal Article (8 results) (of which Peer Reviewed: 8 results,  Open Access: 5 results) Presentation (6 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] INVESTIGATION AND STABILITY ANALYSIS OF SLOPE FAILURE AT EXTREMELY SHALLOW LAYER AFTER SNOWMELT IN SNOWY COLD REGIONS2022

    • Author(s)
      Miura Naoki, Dai Nakamura, Takayuki Kawaguchi, Shunzo Kawajiri
    • Journal Title

      International Journal of GEOMATE

      Volume: 22 Issue: 92 Pages: 109-115

    • DOI

      10.21660/2022.92.gxi371

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A new evaluation method for the erosion control effect of vegetation work against raindrops2021

    • Author(s)
      五郎部 生成, 中村 大 , 川尻 峻三, 川口 貴之, 中陳 実咲希, 宗岡 寿美
    • Journal Title

      Journal of the Japanese Society of Revegetation Technology

      Volume: 47 Issue: 1 Pages: 57-62

    • DOI

      10.7211/jjsrt.47.57

    • NAID

      130008137651

    • ISSN
      0916-7439, 1884-3670
    • Year and Date
      2021-08-31
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effect of degree of saturation on the shear strength properties of soils containing herbaceous plant root systems2021

    • Author(s)
      中村 大 , 宗岡 寿美, 川口 貴之, 川尻 峻三, 山口 滉平, 米村 和城
    • Journal Title

      Journal of the Japanese Society of Revegetation Technology

      Volume: 47 Issue: 1 Pages: 45-50

    • DOI

      10.7211/jjsrt.47.45

    • NAID

      130008137647

    • ISSN
      0916-7439, 1884-3670
    • Year and Date
      2021-08-31
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Rainfall infiltration characteristics of a model embankment slope composed of sandy soil simulating vegetation works2021

    • Author(s)
      中村 大 , 川口 貴之, 川尻 峻三, 乾 勇二, 宗岡 寿美
    • Journal Title

      Journal of the Japanese Society of Revegetation Technology

      Volume: 47 Issue: 1 Pages: 51-56

    • DOI

      10.7211/jjsrt.47.51

    • NAID

      130008137650

    • ISSN
      0916-7439, 1884-3670
    • Year and Date
      2021-08-31
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] An Example of Damage to Slope Stabilization Work Caused by The Frost Heaving of Mudstone and Its Countermeasure2021

    • Author(s)
      Dagvadorj Otgonjargal , 中村大, 川口貴之, 渡邊達也, 川尻峻三, 宗岡寿美
    • Journal Title

      Journal of MMIJ

      Volume: 137 Issue: 7 Pages: 69-78

    • DOI

      10.2473/journalofmmij.137.69

    • NAID

      130008069962

    • ISSN
      1881-6118, 1884-0450
    • Year and Date
      2021-07-31
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 凍結融解履歴が植物根系を含む土の侵食抵抗に及ぼす影響に関する基礎的研究2020

    • Author(s)
      中陳実咲希,中村大,川口貴之,川尻峻三,山下聡,宗岡寿美
    • Journal Title

      河川技術論文集

      Volume: 26 Pages: 455-460

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Influence of differences in soil properties on the reinforcement effect of root systems of herbaceous plants2019

    • Author(s)
      山口滉平,中村 大,川口貴之,川尻峻三,山下 聡,中陳実咲希
    • Journal Title

      Journal of the Japanese Society of Revegetation Technology

      Volume: 45 Issue: 1 Pages: 9-14

    • DOI

      10.7211/jjsrt.45.9

    • NAID

      130007776452

    • ISSN
      0916-7439, 1884-3670
    • Year and Date
      2019-08-31
    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] X線CTスキャンを活用した土の侵食抵抗試験に関する基礎的研究2019

    • Author(s)
      中陳実咲希,中村 大,川口貴之,川尻峻三,山下 聡,山口滉平
    • Journal Title

      河川技術論文集

      Volume: 55 Pages: 505-511

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Deformation Caused by Frost Heave on a Rock Slope of Mudstone2021

    • Author(s)
      Otgonjargal Dagvadorgi, Dai Nakamura, Takayuki Kawaguchi, Sunzo Kawajiri
    • Organizer
      2021 Regional Conference on Permafrost & 19th International Conference on Cold Region Engineering
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 凍結融解履歴を与えた土の侵食抵抗試験2021

    • Author(s)
      中陳 実咲希,中村 大,川口 貴之,川尻峻三,宗岡 寿美
    • Organizer
      地盤工学会北海道支部 第61回地盤工学会北海道支部年次技術報告会
    • Related Report
      2020 Research-status Report
  • [Presentation] X線CTスキャンを活用した植物根系を含む土供試体の侵食抵抗試験に関する基礎的研究2020

    • Author(s)
      中陳実咲希, 中村大, 川口貴之, 川尻峻三, 山口滉平, 宗岡寿美
    • Organizer
      地盤工学会 第55回地盤工学研究発表会
    • Related Report
      2020 Research-status Report
  • [Presentation] X線CTスキャンを活用した土の侵食抵抗試験方法の開発2020

    • Author(s)
      中陳実咲希, 中村大, 川口貴之, 川尻峻三, 山口滉平, 宗岡寿美
    • Organizer
      地盤工学会北海道支部
    • Related Report
      2019 Research-status Report
  • [Presentation] 泥岩からなる岩盤斜面の凍上による変状事例2020

    • Author(s)
      Dagvadorj Otgonjargal, 中村大, 川口貴之, 川尻峻三, 宗岡寿美, 山下聡
    • Organizer
      地盤工学会北海道支部
    • Related Report
      2019 Research-status Report
  • [Presentation] 浸水条件の違いが植物根系を含む細粒土のせん断強度特性に及ぼす影響2020

    • Author(s)
      山口滉平, 中村大, 川口貴之, 川尻峻三, 中陳実咲希, 宗岡寿美
    • Organizer
      地盤工学会北海道支部
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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