Ryunosuke Kido
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View article: Microscopic investigation into density dependence of water retention characteristics of sand during drying-wetting process
Microscopic investigation into density dependence of water retention characteristics of sand during drying-wetting process Open
The density dependence of the water retention characteristics of sand during the drying-wetting process was microscopically investigated. Water retention tests on both loose sand and dense sand were conducted with X-ray micro computed tomo…
View article: Infiltration characteristics of bentonite-based stabilizing fluid into pore spaces of sand investigated by X-ray micro-CT analysis
Infiltration characteristics of bentonite-based stabilizing fluid into pore spaces of sand investigated by X-ray micro-CT analysis Open
The purpose of this study is to experimentally investigate the infiltration characteristics of bentonite-based stabilizing fluid at the microscale to interpret the mud film formation mechanism. An infiltration testing apparatus combined wi…
View article: Effect of the degree of soil structure formed in sand with fines on liquefaction properties
Effect of the degree of soil structure formed in sand with fines on liquefaction properties Open
View article: Microscopic Distribution of Bentonite in Pore Spaces of Sand after Infiltration of Stabilizing Solution with Different Concentrations
Microscopic Distribution of Bentonite in Pore Spaces of Sand after Infiltration of Stabilizing Solution with Different Concentrations Open
In the earth drilling method, ground excavation is performed using stabilizing solution made of bentonite. The solution infiltrates into the excavated ground and forms a mud film on the trench wall, contributing to the stability of the tre…
View article: Sustainable stabilization of sandy soils using steel slag and biopolymer cellulose
Sustainable stabilization of sandy soils using steel slag and biopolymer cellulose Open
View article: Mechanical characteristics and long-term stability of treated soil using finely shredded paper
Mechanical characteristics and long-term stability of treated soil using finely shredded paper Open
View article: Sustainable Stabilization of Sandy Soils Using Steel Slag and Biopolymer Cellulose
Sustainable Stabilization of Sandy Soils Using Steel Slag and Biopolymer Cellulose Open
View article: A microscopic interpretation of hysteresis in the water retention curve of sand
A microscopic interpretation of hysteresis in the water retention curve of sand Open
The hysteresis observed in a water retention curve was experimentally studied through the use of X-ray micro-computed tomography (μCT). The CT images were acquired during the main drying and wetting processes of a water retention test for …
View article: Progressive formation of concentrated seepage path in gap-graded sand due to suffusion and its influence on permeability change
Progressive formation of concentrated seepage path in gap-graded sand due to suffusion and its influence on permeability change Open
Suffusion, which is classified as one of internal erosion, causes change in physical and hydraulic properties of soils during permeation, while the mechanism of permeability change for sands due to suffusion is not sufficiently clear. In t…
View article: Construction and field observation of chain reinforced soil walls in wind power generation projects
Construction and field observation of chain reinforced soil walls in wind power generation projects Open
チェーンを補強材として用いた補強土壁工法として，鋼管を主体とした壁面及び円筒型金網の壁面の 2 種類の補強土壁を開発し，様々な現場で施工を行ってきた。風力発電現場に設置された補強土壁は，仮設の運搬道路においてブレードやタワーなどの重量物を運搬するために重車両が頻繁に往復すること，風車ヤードおいて大型クレーンで風車を組み立てることから，仮設ではあるが重要な位置付けの構造物である。 その施工時の大きな荷重により，補強土壁の変形が懸念されたため，運搬道路と風車ヤードに施工されたチ…
View article: Experimental data of 3D printed granular material for verification of discrete element modeling simulation
Experimental data of 3D printed granular material for verification of discrete element modeling simulation Open
View article: Experimental investigation of bearing mechanism of closed- and open-ended piles supported by thin bearing layer using X-ray micro CT
Experimental investigation of bearing mechanism of closed- and open-ended piles supported by thin bearing layer using X-ray micro CT Open
View article: Investigation of soil deformation characteristics during pullout of a ribbed reinforcement using X-ray micro CT
Investigation of soil deformation characteristics during pullout of a ribbed reinforcement using X-ray micro CT Open
View article: Quantification of pore volume and degree of saturation in partially saturated sands with different bulk density
Quantification of pore volume and degree of saturation in partially saturated sands with different bulk density Open
In the present study, water retention tests on Toyoura sand with high bulk density and low bulk density are conducted. Three-phase microstructures in sand specimens are visualized using an x-ray micro tomography at the different water rete…
View article: INFLUENCE OF BEARING LAYER THICKNESS ON VERTICAL BEARING CAPACITY OF PILE AND SOIL DEFORMATION BEHAVIOR
INFLUENCE OF BEARING LAYER THICKNESS ON VERTICAL BEARING CAPACITY OF PILE AND SOIL DEFORMATION BEHAVIOR Open
杭先端以深の支持層厚が杭先端径に対して薄い支持層（薄層）に杭が支持された場合，支持層下部の軟弱層が杭の鉛直支持力に影響を及ぼすと考えられる．薄層に支持された杭の支持力メカニズムを解明するためには，支持層厚が杭の鉛直支持力特性および地盤の変形挙動に与える影響を把握することが重要である．本研究では，層厚の異なる支持層厚を含む模型地盤を作製し，等方拘束圧条件下で模型杭の押込み試験とX線CT撮影を行った．さらに画像相関法により地盤の変位やひずみ分布を調べ，支持層厚が地盤の変形挙動に…
View article: Distribution changes of grain contacts and menisci in shear band during triaxial compression test for unsaturated sand
Distribution changes of grain contacts and menisci in shear band during triaxial compression test for unsaturated sand Open
It is known that unsaturated soil shows more brittle modes of failure with clearer shear band than fully saturated soil. Investigation of three-phase microstructural changes in shear band of unsaturated soil is important to clarify its mec…
View article: Evaluation of distribution of void ratio and degree of saturation in partially saturated triaxial sand specimen using micro x-ray tomography
Evaluation of distribution of void ratio and degree of saturation in partially saturated triaxial sand specimen using micro x-ray tomography Open
Partially saturated soils are composed of three phases: soil particle, pore water and pore air. The pore water forms menisci among soil particles at which suction works. Suction is higher at the upper part of partially saturated soils due …
View article: MICROSCOPIC CHARACTERISTICS OF PORE WATER DURING PROGRESSIVE DEVELOPMENT OF SHEAR BANDS OF PARTIALLY SATURATED SAND UNDER TRIAXIAL COMPRESSION
MICROSCOPIC CHARACTERISTICS OF PORE WATER DURING PROGRESSIVE DEVELOPMENT OF SHEAR BANDS OF PARTIALLY SATURATED SAND UNDER TRIAXIAL COMPRESSION Open
不飽和土はメニスカス水に働くサクションにより高い強度・剛性を示すが，ピーク強度後は完全飽和土や乾燥土に比べて明瞭なせん断帯と顕著なひずみ軟化を伴い脆性的な破壊モードを示す．不飽和土の破壊メカニズムの解明には，せん断帯発達に伴うサクションの進行的な変化や，メニスカス水の分布が巨視的な力学挙動に及ぼす影響を把握することが重要である．本研究では，不飽和砂の三軸圧縮過程で生じるせん断帯をX線CTで可視化し，間隙水の曲率，存在形態を調べる画像解析を行った．その結果，せん断帯の発達過程…
View article: Local water-retention behaviour of sand during drying and wetting process observed by micro x-ray tomography with trinarisation
Local water-retention behaviour of sand during drying and wetting process observed by micro x-ray tomography with trinarisation Open
In the present study, water-retention behaviour of sand during drying and wetting process has been observed microscopically using micro x-ray computed tomography (CT). CT images taken at different water-retention states during drying and w…