Capillary barrier using geosynthetics for slope disaster prevention at heavy rain

• Project/Area Number: 26420480
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Shinshu University
• Principal Investigator: KAWAMURA Takashi 信州大学, 学術研究院工学系, 准教授 (50324231)
• Co-Investigator(Kenkyū-buntansha): 梅崎 健夫 信州大学, 学術研究院工学系, 教授 (50193933)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 地盤工学 / 斜面防災 / 不飽和土 / サクション / ジオシンセティックス / 保水特性 / 透水性 / 圧密特性 / キャピラリーバリア

Outline of Final Research Achievements

A series of water retention tests were carried out for seven nonwoven geotextiles in different materials and processes of manufacture. The van Genuchten model was applied to the water retention curve obtained from the above-mentioned test and published data. Estimation of the water retention curve using the saturated hydraulic conductivity of nonwoven geotextile was examined. Main conclusions are as follows. The water retention curves in drainage phase of nonwoven geotextiles are S-shaped curve just like that of soil materials. And the curves of nonwoven geotextiles can be estimated by the van Genuchten model. By carrying out only the permeability test of saturated nonwoven geotextiles, it is suggested that the water retention curve in drainage phase can be estimated.

Research Products

• [Journal Article] 不織布の飽和透水係数を用いた排水過程における水分特性曲線の推定 (2017)
  • Author(s): 河村 隆，梅崎健夫，坪山龍太
  • Journal Title: ジオシンセティックス論文集 Volume: 31 Pages: 149-154
  • NAID: 130006894918
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 不織布の排水過程における水分特性曲線に及ぼす拘束圧の影響 (2017)
  • Author(s): 河村 隆，梅崎健夫，坪山龍太
  • Organizer: 第52回地盤工学研究発表会
  • Place of Presentation: 名古屋国際会議場（名古屋市）
  • Year and Date: 2017-07-12
• [Presentation] 各種不織布の水分特性曲線に対するvan Genuchten式の適用（その１） (2016)
  • Author(s): 河村 隆，梅崎健夫，坪山龍太
  • Organizer: 第51回地盤工学研究発表会
  • Place of Presentation: 岡山大学（岡山市）
  • Year and Date: 2016-09-13