遠心力場における動的実験システムの開発

Abstract

Centrifuge model test is one of the most remarkable topics in recentgeotechnical engineering. The same stress field can be achieved in the modelground under centrifugal condition as that in real ground or soil structure athomologous points. Therefore, the performance of model test in centrifuge has greatadvantage because the deformation or failure characteristics of soil much depends onthe confining pressure. In the field of soil dynamics, it is also becoming popular tomake use of centrifuge to investigate the dynamic property of soil or response ofground and structures during earthquake.In this paper, first of all, the similarity law of centrifuge model test based onthe theory of continuum for 2-phase mixture is reviewed, secondly, the schematicaldescription about the medium size of centrifuge (radius of 2.5 m, max centrifugalacceleration of 200 g, capacity of 24 g-ton) and shaking test apparatus are presented.From the dynamic test with the laminar box, it is found that the electro-hydraulic actuator makes it possible to produce well-controlled sinusoidal motionwith maximum shaking acceleration more than 10 g, under centrifugal acceleration of50g.