Author(s): Riccardo Martino; Carmine Sabatino; Lucio Taglialatela
Linked Author(s): Lucio Taglialatela
Keywords: Debris flow; Granular system; Rheology; Quasi static stress; Plasticstress; Static friction angle
Abstract: A rheological analysis concerning experiments carried out in the Hydraulics Laboratory of the University of Trent (ITALY) is presented. A free surface flow has been studied and velocity and concentration distributions have been obtained. Starting from the collisional rheological model, verified in a previous work, the quasi static component of the stress has been singled out. The analysis showed a clear dependence between the extension of the static friction angle to the dynamic case, used modelling the shear quasi static stresses, and the local value of the solid concentration. The extension of the friction angle rises when the solid concentration increases according to that happens with the static friction angle in the earth science. Finally, for the material examined, the concentration at fluidity that many Authors use in their constitutive equations has been valuated
Year: 2001