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不飽和土のミクロ構造変化の解明とマクロな強度評価方法の確立

非饱和土微观结构变化的阐明及宏观强度评价方法的建立

基本信息

批准号：
17J06250
负责人：
木戸隆之祐
金额：
$ 1.09万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2017
资助国家：
日本
起止时间：
2017-04-26 至 2019-03-31
项目状态：
已结题

项目摘要

本研究では，排気-排水，排気-非排水条件の不飽和砂三軸圧縮試験を実施し，初期飽和度の異なる供試体を作製し各条件下での変形・破壊挙動の違いを調べた．また， X線CTとCT画像解析を適用し，特にせん断帯を含む局所領域における間隙水の微視的特性を調べることで，砂のマクロな挙動とミクロ構造変化との関係の解明を試みた．CT画像解析を行った結果，排水条件によらず，限界状態における局所的な間隙比は同じになること，初期飽和度が同じであれば局所的な飽和度もほぼ同じになること，液架橋の数はせん断中に減少傾向を示すこと，液架橋の数が減ることが明らかとなった．一方，非排水条件では，液架橋の数が排水条件よりも多く減少する傾向にあり，間隙水の曲率も減少することが明らかとなった．初期飽和度が低い場合，サクションは不飽和砂のせん断剛性とせん断強度を効果的に高めると考えられる．非排水条件でせん断すると，排水条件に比べてより多くの液架橋が減少し，間隙水の曲率も減少するため，サクションの効果が発揮されず，結果としてピーク応力と残留応力は排水条件よりも低くなる．初期飽和度が高い場合，間隙水の連続性が低い状態に比べせん断剛性やせん断強度に対するサクションの効果が小さいため，ピーク応力まではサクションが巨視的応答へ及ぼす影響は排水条件と非排水条件で差がなく，両条件におけるピーク応力に差が生じない．一方，非排水条件では液架橋の数も間隙水の曲率も排水条件に比べて減少するため，サクションがせん断剛性やせん断強度へ及ぼす影響が小さくなり，残留応力の低下につながる．このように，間隙水のミクロな特性が不飽和土のマクロな応答へ影響を与えることが本研究により明らかとなった．

In this study, drainage-drainage, drainage-non-drainage conditions and sand conditions are applied. In the initial stage, the system is used for the purpose of monitoring the shape of the body under various conditions. the X-ray CT CT portrait is used for the analysis of the image, especially the characteristics of the micro-TV in the field of the machine. The results of CT image analysis show that the drainage conditions are different, the gap ratio of the limited state station is the same as that of the station, the initial temperature and temperature are the same as those of the station, and the temperature of the rack is the same as that of the station, and the temperature of the rack is the same as that of the station. One side, the non-drainage condition, the drain condition, the drainage condition, the more, the less, the curvature of the gap water, the curvature of the gap water, The non-drainage condition is broken, the drainage condition is less than that of the liquid rack, the curvature of the gap water is less, the curvature of the gap water is less than that of the non-drainage condition. Results the results showed that the residual force was affected by the residual force and the drainage condition was lower than that in the early stage. in the early stage, the connection of crevice water is lower than that of high temperature, and the connection of crevice water is lower than that of interstitial water. On the one hand, the non-drainage condition, the number of liquid rack, the curvature of gap water, the curvature of drainage, the strength of fracture, the strength of fracture, the strength of fracture and the residual force are lower than those in non-drainage condition. In this study, the relationship between the characteristics of the gap water and the characteristics of the gap water, the characteristics and the characteristics of the gap water, the characteristics, the characteristics and the characteristics of the study.