Grain size dependent rheology on the mobility of debris flows

When dealing with natural geo hazards It is important to understand the influence of flow characteristics on the submarine landslides, because the flow characteristics of fine-grained soils are most likely governed by the theological properties It may further relate to the mobility analysis of debris flow Geotechnical and theological Investigation on the clay rich materials were compared with those of silt rich materials For the examined fine-grained sods the flow behavior depends on the volumetric concentration of solid and surface phenomenon particularly for non swelling materials Assuming that the debris flow materials behave as the Bingham fluid a possible relationship between geotechnical and theological properties are proposed From an empirical relation ship between yield stress and plastic viscosity, a comparison emphasizes the gram sue effect on the theology of geomaterials encountered in various environments The larger the particle size involved in the matrix the lower the value of viscosity which is m the order of 10 times Debris flow mobility with respect to theology concerning the large particle size is emphasized