不飽和土の透水特性に及ぼす間隙空気の挙動

孔隙空气对非饱和土渗透性能的影响

• 批准号: 14750411
• 负责人: 神谷 浩二
• 金额: $ 2.5万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14750411/
• 关键词: 透気係数; サクション制御型透気試験法; 透水係数; 間隙径分布; 不飽和土; 透気試験方法; 水分特性曲線; 空気圧入法; 水分法

河川堤防などの土構造物が降雨・洪水時に浸水を受ける現象の機構解明では,不飽和土中における間隙空気の挙動(透気特性)と透水性の相互関係を把握することは重要である.本研究は,主に砂質土やシルト質土を対象として,土の間隙構造の視点で,不飽和土中における間隙空気の挙動が透水性に及ぼす影響を究明したものである.一方で,透気・透水係数や水分特性曲線の浸透特性値データを蓄積して,粒度などの土質物性から浸透特性値が容易に得られる推定手法を検討した.本研究で得られた成果の概要は以下のようである.先ず,不飽和土の透気試験装置・手法について検討した結果,(1)試作した装置では,従来のものに較べると,同一試料層に対して飽和度を制御しながら連続的に透気試験ができる.また,(2)この試験によって,筆者らが提案した空気圧入法や従来の水分法による間隙径分布を推定できることが判明した.次に,不飽和土の浸水時における透気係数の変化について検討して,(3)そのときの透気係数と飽和度・サクションのそれぞれとの関係は,土の初期の飽和度・サクションによって異なり影響を受けることなどが得られた.一方,砂質土やシルト質土を対象として,粒度から水分特性曲線を推定する手法を究明した.従来から提案されている手法についてそれぞれ整理するとともに,それらの推定精度を検証した.そして,(1)体積含水率を粒径の頻度分布から算出し,サクションを筆者らのβr値と粒径から算出することによって,水分特性曲線が精度良く推定できることを見出した.

In the event of rainfall and flood, the flooding of river embankments and soil structures is subject to the interpretation of the mechanism, and the water permeability of water permeability is related to each other in terms of water permeability and water permeability. In this study, the main purpose of this study is to analyze the effects of soil temperature, soil gap, water permeability and water permeability in soil. On the one hand, the number of permeable water, the curve of water characteristics, the characteristics of infiltration, and the particle size, the physical properties of soil, the properties of infiltration, the characteristics of permeability, the number of permeability, the number of water characteristics, the curve of water characteristics, the characteristics of permeability, the number of permeability, the curve of water characteristics, the curve of water characteristics, the characteristics of infiltration, the physical properties of soil, the properties of infiltration, the method of presumption. The results of this study are summarized below. In the first place, the results are as follows: (1) the device is used as a device, and the results are as follows: (1) the device is used as a device, and the same material is used to control the connection. In this paper, the author proposes that the water method should be used to determine the presumption of gap diameter distribution. In the second time, when the soil was immersed in water, it was used to reduce the temperature and temperature of the soil, (3) the temperature and temperature of the soil, the initial temperature and temperature of the soil, the temperature of the soil, the temperature, the temperature and the temperature. On the one hand, the sand and soil are similar to each other, and the grain size, the water characteristic curve, the presumption method, and the method are discussed. In this paper, the proposal is proposed, and the method is used in order to determine the accuracy of the presumption. Water content, (1) bulk moisture content, particle size distribution, particle size distribution, water content curve, water characteristic curve, water content curve, moisture characteristic curve, water content curve, moisture characteristic curve, water content curve, moisture characteristic curve, moisture characteristic curve, water content curve, moisture characteristic curve, water content curve, moisture characteristic curve, water content curve, moisture characteristic curve, water content curve, moisture characteristic curve, water content curve, water characteristic curve, moisture characteristic curve, water content curve, moisture characteristic curve, moisture characteristic