Attending a debriefing meeting of Prof Zhang's laboratory
I participated in the interim presentation of the thesis of the Graduate School of Nagoya Institute of Technology's Geotechnical Engineering Group in the Zhang Laboratory.It was the first time in a long time that I had a stimulating time listening to the presentations of other laboratories. I may have made a little bit of an […]
New laboratory members!!
Three undergraduate students have been assigned to our lab. They are the opening members!We believe that there is some kind of fate in being assigned to a laboratory. We hope to learn and absorb a lot of things and enjoy our research activities together.The first hybrid seminar was held today. Unfortunately, due to poor arrangements […]
Workshop on "Bentonite"at Waseda Univ. & Experiment at UTokyo
On October 13, I attended a bentonite study group at Waseda University. Young researchers? The discussion among young researchers is heated and stimulating! I would like to do my research well and provide good information. The next day, October 14, I will be conducting experiments at the Soils and Geotechnical Laboratory of the University of […]
Constitutive modeling of expansive soils considering the surface phenomena of mineral crystals
Swelling clays are widely found throughout the world, and are also widely distributed in Japan, mainly in strata from the Neogene period onward. On the other hand, bentonite, a typical swelling clay, is a candidate buffer material for radioactive waste disposal facilities. However, swelling clays are considered as special soils for which no design method […]
Ice-water-soil coupled mixture theory and Isogeometric FEM
When water in the ground transforms into ice, force equilibrium, conservation of mass, and conservation of energy with consideration of latent heat exist for the three phases of soil, water, and ice, and there are interactions among them. In this study, the governing equations for such a soil-water-ice three-phase mixture are formulated. The above mixture […]
Elastoplastic constitutive model for unsaturated soils
Surface tension acts at the interface between water and air. The surface tension attracts soil particles in unsaturated soil, making the soil stronger and stiffer.In order to consider the effect of surface tension (suction) on deformation strength characteristics, this study proposes an elastoplastic model in which the normal consolidation line, which defines the soil existence […]
Modified stress considering the fabric of soil particles and the elastoplastic constitutive model
As an aggregate of particles, soil changes its particle structure as a result of stress history. Even if the stress state and density are the same, the soil exhibits various behaviors depending on the differences in particle structure. The fabric tensor, which represents the directional distribution of the particle contact normal, is known as an […]
What is constitutive modeling?
In the physical phenomena we witness, conservation laws of physical quantities (governing equations) such as momentum, mass, and energy are satisfied.In order to predict a phenomenon, the governing equations must be solved, which requires an equation (model) that represents the properties of the material.To solve the equation of equilibrium of an object, a constitutive model […]
Graduation ceremony and farewell party at UTokyo
A few days ago, there was a graduation ceremony (fall) at the University of Tokyo, my former affiliation, and a student I was working with graduated successfully. Congratulations!We also had a get-together with all the lab members and had a good time. Although I have moved to a new position, I plan to continue my […]
Establishment of a laboratory!!
Kyokawa Laboratory at Nagoya Institute of Technology (NITech) has been launched on 1st September 2022.Still, the faculty member (with some students in UTokyo) is alone. Mainly focusing on the establishment of theory predicting a ground deformation, we would like to develop counter measurements and new geotechnical material. We will engage in technological development, social contribution, […]