Basic Research

1. Introduction
1-1. PPT for granular mechanics
1-2. PPT for slope failure

2. Visualization exp.
2-1. LAT
2-2. Micro X-ray CT

3. Numerical simulation
3-1. DEM
3-2. SPH


4. Lunar Soil Mechanics

5. Slope Failure and Flow



Publication List

Google scholar


Geotech. Group

We study the mechanics of GRANULAR MATERIALS including geomaterials, engineering powders, and others. We are developping new experimental and simulation techniques to understand and describe the complicated bulk behavior of such materials from grain scale behavior. Applications to various fields such as planetary science and environmental engineering are also our great concern.

WHAT'S NEW (Last update: 2016.06.08)
  A presentation entitled "Micromechanics of Lunar Soil" was given in IMS-Chubu 2016 "New concepts and new developments in soil mechanics and geotechnical engineering" The abstract is HERE
(2016/05/26-27 in Nagoya University, Nagoya)

  An invited talk was made in the international workshop: MTiG4 "Modern Trends in Geomechanics". The title is "MICROMECHANICAL ASPECTS OF NATURAL FORMATION PROCESS OF GEOLOGICAL GRAINS". The abstract is HERE
The workshop website is HERE (2016/05/16-18 in Assisi, Italy)

After the workshope, I was invited to University of Cassino by Prof. Giuseppe Modoni and gave a one-hour talk. The poster is HERE

  A short visit to NUDT (National University of Defense Technology, Changsha, China) was made with Prof. Rafi Blumenfeld to give two lectures.

  A presentation entitled "Grain crushing and structural evolution of geomaterials under high pressure" was given in the international Workshop "Avalanches, plasticity, and nonlinear response in nonequilibrium solids (organized by Prof. Hisao Hayakawa of Kyoto University)" held in Yukawa memorial Hall of YITP (Yukawa Institute of Theoretical Physics), Kyoto University.
Conference website is HERE
(2016/03/7-9 in YITP, Kyoto University)

  An invited presentation was given in IWACOM-III(3rd International Wrokshop on Advances in Computational Mechanics). The abstract is HERE (2015/10/12-14, Tokyo)

  I co-organized with Prof. Matthew Kuhn MS02: Dr. Masao Satake Memorial Symposium on Granular Mechanics in EMI(Engineering Mechanics Institute) conference, ASCE.
Conference website is HERE (2015/06/16〜19)

  We invited Prof. Itai Einav of University of Sydney to have a collaborative research work. (2015/04/12〜28)

  I visited NUDT (National University of Defense Technology, Changsha, China) with Prof. Rafi Blumenfeld, and gave two invited lectures. (2015/03/29〜04/01)

  We had Prof. Rafi Blumenfeld of Cavendish Lab. in Tsukuba as a short-term invited researcher of JSPS to perform a collaborative research on granular physics. (2015/03/14〜29)

  We had Prof. Jacques Desrues, Prof. Simon Salager and Ms. Ghonwa Khaddour of Laboratoire 3SR, Grenoble, France and Prof. Yosuke Higo of Kyoto University in Tsukuba, and organized a seminar on Geotechnical Engineering. (2015/03/12)

  I visited JKUAT (Jomo Kenyatta University of Agriculture and Technology) in Kenya with Prof. Yamada, Prof. Takewaka, Prof. Yamamoto and Prof. Morio. (2015/3/5)

  A presentation entitled "Particle Grading Effect on Mechanical Properties of Lunar Soil Simulant FJS-1" was given in Earth and Space 2014 (organized by ASCE Aerospace division). The conference paper is HERE。 Conference web site is HERE。 (2014/10/27, St. Louis, Missouri, USA)

  I co-organized a Mini-symposium MS6 Micro-geomechanics in 14IACMAG held in Kyoto. Ms. Ni Zhang and Ms. Alessandra M. Nakata of our lab gave talks. (2014/9/23)

  A key-note lecture entitled "Meso-scale structural characteristics of clay deposit studied by 2D Discrete Element Method" was given in IS-Cambridge. Conference web site isHERE
Photo with Prof. Schofield (2014/9/2)

  We won 2013 best paper award of applied mechanics committee, JSCE(Japan Society of Civil Eengineers). The paper title is "High speed projectile impact to sand deposit: Soil mechanics interpretation of Hugoniot equation of state (in Japanese)".

  A presentation entitled "Plastic compression of sands due to grain crushing under high pressure" was given in COMPSAFE 2014 conference in Sendai, Japan (2014/4/16). Conference website).

  I spent three weeks in Laboratoire 3SR, Universite Joseph Fourier to work with Prof. Cino Viggiani (2014/3/10-4/4).

  Our article entitled "Universal structural characteristics of granular packs" was published in Physical Review Letters (2014/3/24). In details).

  A presentation entitled "Granular mechanics in planetary science and engineering" was given in 18th ISSMGE conference in Paris (2013/9/5). Conference website).

check.gif A presentation entitled "Simulation of long-term erosion-sedimentation process using particle method" was given in the international workshop "Stratodynamics" in Nagasaki University (2013/8/30). In details).

check.gif A presentation entitled "Microstructural characteristics of planar granular solids" was given in Powders and Grains 2013 in Sydney (2013/7/19). Conference website).

check.gif A presentation entitled "Elementary volumes distribution in 2D granular solids" was given in the international workshop on Physics of Granular flows (Organizer: Prof. Hisao Hayakawa) at YITP, Kyoto University (2013/6/26). Workshop program).

check.gif Several lectures on granular mechanics were given in an advance school "Multiscale Mechanics fo Granular Materials" in Udine, Italy (2012/9/03-07). Flyer).

check.gif A research on structural characteristics of granular pack was presented in 8th European Solid Mechanics Conference held in Graz, Austria (2012/7/9-13). Conference site).

check.gif A research on structural characteristics of granular pack was presented at the international symposium on Discrete Element Modelling of Particulate Media held in University of Birmingham (2012/3/30-31). Conference program).

check.gif I stay in Cambridge, UK. from Aug. 2011 to Aug. 2012 as a visiting researcher in Cavendish Laboratory, University of Cambridge. I work on Granular physics with Dr. Rafi Blumenfeld.

  A paper on the surface regolith of asteroid Itokawa was published in Science. The first author is Prof. Akira Tsuchiyama of Osaka University. In details).

check.gif We organize a special lecture entitled "Recent activity on landslide disaster mitigation" on Dec. 13th in University of Tsukuba. (Click HERE in details (in Japanese))

check.gif We won a 2009 BEST PAPER AWARD of Journal of Aerospace Engineering, ASCE. (Click HERE in details.)

check.gif A simple micromechanics model for estimating shear strength of Mathane Hydrate (MH) sediment was presented in the 2nd Symposium on Methane Hydrate Resources in Japan organized by MH21 Research Consortium. (2010/12/2)

check.gif A micromechanical research on liquefied soil was presented in the international workshope entitled "Recent Progress in Physics of Dissipative Particles " held in Yukawa Institute for Theoretical Physics ( YITP ), Kyoto University (2010/11/24-26).

check.gif A granular mechanics study using micro X-ray CT at SPring-8 was presented at The 1st international Workshop on X-ray CT Visualization for Socio-Cultural, Engineering, & Environmental Materials. (2010/11/18-19)

check.gif A research on the Image-based Dicrete Element simulation of real sand was presented in an internalational synposium IS-Shanghai 2010. (2010/10/10-12)

check.gif An invited presentation was made at a workshop PMEE(Particulate Mechanics in Extreme Environment) held in LLNL (Lawrence Livermore National Laboratory. (2010/9/20-24)

check.gif A micromechanical constitutive model was presented at anual conference of EMI(Engineering Mechanics Institute) held in USC (University of Southern California). (2010/8/9-13)

check.gif A micromechanical research on shear band width in granular assembly was presented in WCCM(World Conference on Computational Mechanics)2010 held in Sydney, Australia. (2010/7/19-23)

check.gif Our paper entitled "Grain properties and bulk mechanical behavior of Lunar surface soil" was published in the Bulletin of the Japanese Society for Planetary Sciences, Vol. 19, No.2, 2010.
Click HERE to see the article (in Japanese) (2010/06)

check.gif Our laboratory had a new Brasilian research intern of Japanese extraction via JICA (Japanese International Cooperation Agency. (2010/4/19-2011/1/28)。

check.gif Our lab had a research seminar with Prof. Richard J. Bathurst of Royal Military College of Canada and Prof. Yoshihisa Miyata of National Defense Academy of Japan (2010/4/8)。

check.gif Our proposal entitled "Study on sedimentation process of Lunar surface soil based on grain characteristics" was accepted as the Grant-in-Aid for Scientific Research (B) (No. 22340158), JSPS. (2010.4)

check.gif A joint workshop on Landslide Disaster Mitigation between University of Tsukuba and Southwest Jiaotong University (2010/3/23)
We also went to the field survey on 2008 Wenchuan Earthquake.

check.gif An invited presentation was made in Earth & Space 2010(Hawaii). (2010/3/15)

check.gif We had a special lecture on "Statistical Physics on Dissipative Particles" by Prof. Hisao Hayakawa of Yukawa Institute of Theoretical Physics, Kyoto University.
We also held a free discussion seminalr entitled "Physics of complicated fluid and its application on the next day. (2010/3/3-4)

check.gif We had a visiting professor Raphael Blumenfeld of Cavendish Laboratory, Cambridge University as an international collaboration project of University of Tsukuba (2010/2/6-3/6)

check.gif Our geotechnical engineering group has been funded by Ministry of Land, Ingrastructure, Transport and Tourism, Japan, for the research project on construction technology entitled " Development of an integrated system for estimating slope failure and resultant damage to housings and roads caused by earthquake or heavy rain" (Project leader: Prof. Yasuo Yamada) during 2009-2010.

check.gif Our geotechnical engineering group has been funded by JSPS as the Grants-in-Aid for Scientific Research, type A (No.21246075) (Project leader: Prof. Yasuo Yamada, Univ. of Tsukuba) during 2009-2012.

check.gif Micro X-ray CT image of Lunar soil was used in a NHK TV program "Science ZERO". (2009/1/11)