A centrifuge machine increases stress and water pressure in a model ground with a centrifugal acceleration and produces the same behaviours as that in a prototype-scale structure. This machine is one of the most frequently used experiment tools in the geotechnical engineering field for examining the movement of prototype-scale structures. The research themes range from static problems to seismic ones, including earthquake and ocean waves. In ocean and coastal areas, there are needs to elucidate ground behaviours under a large earthquake, tsunami, and high tide and waves for ensuring the stability of civil engineering structures. Therefore, our research institute decided to introduce new systems and equipment which can reproduce large earthquakes and generate waves and flows in a centrifuge by renovating the second machine owned by our institute for more than 20 years. A secondary purpose of the renovation is to update old parts used for a long time. The renovation work was carried out over two years between 2016 and 2018. This paper introduces updated and newly installed devices, and it also includes the history of our centrifuge machines and some parts that were reused from the second machine to aid the readers to easily understand the machine in its entirety.

Key Words: centrifuge machine, shaking table, wave generator, water supply tank, image analysis