Author(s): Riccardo Martino; Carmine Sabatino; Lucio Taglialatela
Linked Author(s): Lucio Taglialatela
Keywords: Debris flow; Granular system; Rheology; Collisional stress
Abstract: A local rheological analysis has been worked out to check the existence of collisional-dilatant regime as provided by a Bagnold type relationship. The results carried out on a uniform flow in an open channel (located at Hydraulic Laboratory of Civil and Environmental Engineering Department of the University of Trent, ITALY) of solid (PVC) and water mixture, have showed that the collisional regime takes place only when the Bagnold number is bigger than a critical value. This critical value is greater than that proposed from Bagnold. Anyway the analysis confirms the validity of the Bagnold formulas, regarding both normal and shear stresses, even though the experimental parameters are different maybe because of the particular shape (cylindrical) of the particles constituting the solid phase. Finally the importance of the quasi-static stresses is showed.
Year: 2001