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地盤の間隙構造の評価手法とその利用に関する研究

土壤孔隙结构评价方法及其利用研究

基本信息

批准号：
12750445
负责人：
神谷浩二
金额：
$ 1.41万
依托单位：
Gifu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Encouragement of Young Scientists (A)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

本研究は,土(特にシルト質土)や風化岩の間隙構造の評価・表現法を究明して,一方で,間隙構造の観点から粒度などの土質物性と不飽和土の浸透特性値との関係を検討したものである.本研究で得られた成果は次のようである.1.シルト質土や風化岩の間隙径分布計測筆者らの従来研究による砂質土の間隙構造評価に対比して,微細な間隙径をもつシルト質土や風化岩の評価を検討した.主に,間隙部分を毛管モデルで近似したときの間隙径分布を,筆者らが開発した「空気圧入法」による計測を試みた結果,(1)0.003〜0.3mmの範囲の間隙径を計測できることが確認され,その値は顕微鏡観察による間隙径と比較しても遜色ないものであった.しかしながら,(2)分布表現に関係する間隙体積量は毛管モデルに基づくと大きめに評価される傾向が認められたため,平行板モデルなどの適用を試みたが今後の検討事項とした.2.土質物性による水分特性曲線の推定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.具体的には,従来のAryaやHaverkampの手法を参照しながら,粒度と間隙径分布の関係,間隙径分布と水分特性曲線の関係をそれぞれ検討した.その結果,(1)水分特性曲線は,飽和体積含水率,空気侵入値,中間的飽和度の直線勾配λの3要因で決定されることが判明した.(2)飽和体積含水率の値は福田らの粒度評価径によって大略を推算でき,空気侵入値の値は筆者らのβ_γ値と85%粒径を用いて求めることができる.また,(3)直線勾配λは粒度の均等係数によって表現できることを見出した.即ち,水分特性曲線は粒径と均等係数を用いて推定できることが得られた.

In this study, soil (special soil), chemical rock gap, surface method, grain size, particle size, soil physical properties and soil permeability were studied. In this study, we have obtained the results of this study. 1. In order to study the gap distribution of sand and sand, the distribution of clearance diameter is measured, and the micro-gap is used to study the gap distribution of sand and sandy soil. In the main part of the gap, the gap is similar to the distribution of the clearance diameter, and the results of the calculation of the air clearance method are as follows: (1) the calculation of the clearance diameter in the range of 0.003~0.3mm is confirmed, and the measurement of the clearance diameter is more accurate than that of the air gap. (2) the distribution shows that there is an active gap between the capillary and the body, and the parallel plate is used in the future. 2. Soil physical properties, water characteristic curve, presumption, sand, soil, grain size, water property curve, water characteristic curve, grain size, water property curve, water characteristic curve, grain size, water property curve, moisture characteristic curve, grain size, moisture characteristic curve, grain size, moisture characteristic curve, moisture characteristic curve, grain size, moisture characteristic curve, moisture characteristic curve, grain size, moisture characteristic curve, moisture characteristic curve, grain size, moisture characteristic curve, moisture characteristic curve, grain size, moisture characteristic curve, moisture characteristic curve, grain size, moisture characteristic curve, moisture characteristic curve, For specific information, the Arya Haverkamp method refers to the size distribution of clearance diameter, the distribution of clearance diameter and the curve of water characteristics. The results of the test are as follows: (1) the water characteristic curve, the moisture content of the body, the air invasion, and the vertical alignment of the temperature in the middle λ should be determined by the determination of the temperature. (2) the temperature and the water content of the Foton particle size are determined by the general calculation of the particle size, and the particle size of the air intrusion is 85% of the total particle size. Straight-line alignment, (3) straight-line matching, the granularity is equal, the number of data is equal, and the performance is very high. That is to say, the water characteristic curve "equal number of particle size" is used to deduce that the particle size of the water characteristic curve is equal.