Student written Research Laboratory Guidebook 2023Nagaoka University of Technology


Geotechnical Engineering Laboratory

Professor / TOYOTA Hirofumi  Technical Staff / TAKADA Susumu

ProfessorTOYOTA Hirofumi

profiles and activiities profiles and activiities at nagaoka university of technology

Technical StaffTAKADA Susumu

profiles and activiities profiles and activiities at nagaoka university of technology
  • Fundamental research on the ground which supports infrastructure
  • Investigator of the ground
  • Inquire the ground motion in millimeters


TOYOTA Hirofumi
Professor Toyota excels in fundamental research on the ground mechanics and has published papers in international academic journals. Furthermore, as the leading person on the laboratory soil tests, the professor has chaired the committee to establish many JIS standards. Dr. Takada is a reliable person who solves the experimental troubles. The professor is always looking after his students not only for studying but also for everyday life.

Research Content

We are conducting research regarding the ground that supports our living infrastructure. Japan has limited narrow national land and has been suffered by many natural disasters. Therefore, it is necessary to use effectively the underground space and to form the resilient ground against natural disasters. In the response to these needs, we have contributed to provide the results based on fundamental study with taking advantage of University’s strengths. In particular, we are conducting laboratory soil element tests on sand and clay, and model tests on liquefaction and ground vibration. We are striving to study hard to provide safe and secure in our everyday life.

Failure plane of unsaturated soil on three principal stress space

A Day in the Lab

Students in the laboratory are conducting experimental works to obtain new findings. Therefore, we use our time to prepare the samples for experiments, to check data, and to establish experimental programs. It sometimes takes long time to get the data from experiments. However, it is possible to use time effectively by making plan considering work-life balance. Consequently, we can also acquire a schedule management ability. Besides research, there are some events such as ball games, conference presentations, and watching fireworks. In these events, all students in the laboratory are working together and enjoying themselves with full power!

Prepared triaxial apparatus for soil testing

Thesis Subjects

  • (M)Effects of stepwise changed strain rate on stress-strain relationships of soils
  • (M)Change of sand particle orientation induced by liquefaction using triaxial tests
  • (M)Strain range dependence on shear modulus of anisotropically consolidated sand

The number of
PhD Graduates


Major employers of Graduates

  • Ministry of Land, Infrastructure, Transport and Tourism
  • Niigata Prefecture
  • Japan Railway Construction, Transport and Technology Agency
  • East Japan Railway Company
  • Central Japan Railway Company
  • Central Nippon Expressway Company Limited
  • Kajima Co., Ltd.
  • Shimizu Co., Ltd.
  • Obayashi Co., Ltd.
  • Nippon Koei Co., Ltd.
Writer : TSUKADA Chihiro, Civil and Environmental Engineering
(Niigata Prefectural Niitsu High School)