Mechanisms and Constitutive Modeling of Unstable flow of Granular Materials

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There are many flow phenomena in geotechnical engineerlng ; e.g.mudflow during and after strong rainfall, flow slide owing to the liquefaction after strong earthquake motion, flow slide in the seabed. These phenomena have not been investigated in the engineering to a sufficient level, which had nothing to do with the design of structures. The flow problem of geo-materials have been studied with the hydraulic-mechanics approach, the initiation and cease condition of flow, requiring the solid mechanics approach, have not been discussed to a sufficient level. The study presented in this paper have shown the importance of internal fabrics and the creation of fabric called force chains on the initiation and cease conditions of flow phenomena.