Application of a SPH depth-integrated model to landslide run-out analysis

作者：Pastor M^*; Blanc T; Haddad B; Petrone S; Sanchez Morles M; Drempetic V; Issler D; Crosta G B; Cascini L; Sorbino G; Cuomo S

来源：Landslides, 2014, 11(5): 793-812.

DOI：10.1007/s10346-014-0484-y

• Rock-debris avalanches
• Run-out
• Numerical modelling
• Rheological modelling
• Depth-integrated models

Hazard and risk assessment of landslides with potentially long run-out is becoming more and more important. Numerical tools exploiting different constitutive models, initial data and numerical solution techniques are important for making the expert%26apos;s assessment more objective, even though they cannot substitute for the expert%26apos;s understanding of the site-specific conditions and the involved processes. This paper presents a depth-integrated model accounting for pore water pressure dissipation and applications both to real events and problems for which analytical solutions exist. The main ingredients are: (i) The mathematical model, which includes pore pressure dissipation as an additional equation. This makes possible to model flowslide problems with a high mobility at the beginning, the landslide mass coming to rest once pore water pressures dissipate. (ii) The rheological models describing basal friction: Bingham, frictional, Voellmy and cohesive-frictional viscous models. (iii) We have implemented simple erosion laws, providing a comparison between the approaches of Egashira, Hungr and Blanc. (iv) We propose a Lagrangian SPH model to discretize the equations, including pore water pressure information associated to the moving SPH nodes.

• 出版日期2014-10