A simplified analytical model for the design of flexible barriers against debris flows

A debris flow is usually represented by a mixture of solid particles of various sizes and water, flowing along a laterally confined inclined channel-shaped region; debris flow protection barriers are the focus of this research. In particular the paper presents a simplified structural model of cable-like retention barriers based upon the equation of equilibrium of wires under large displacements condition. Inputting the debris flow features, the model returns restraining forces and cable stresses that can then be used for an appropriate barrier design. Some parametrical tests were performed to analyze how the impact velocity and the mass density of the debris influence the maximum tensile force and the acting load in the cables: also the assessment of the energy associated to debris flow is performed. Results are here presented and discussed.