Análise dos esforços de impacto de debris flows

Abstract

Debris flows are the most difficult landslide to be predicted and they can cause catastrophic lost. The use of protection structures, in most of the areas that are susceptible to the occurrence of debris flows, is the most appropriate intervention for the safety of human lives and infrastructures. Projects of protection structures require knowledge of basic parameters of debris flows. The COPPE-UFRJ / PUC-RIO DEBRIS FLOW group has developed researches of this phenomenon in Brazil, obtaining representative results of retro-analyzes, consistent correlations with final volumes, potential impact areas and runout distance. However, parameters such as velocity, flow height, energy and impact force are very difficult to measure and obtain. The objective of this research is to study deeply these parameters in order to obtain more knowledge for the design of impact barriers. Simulations were performed in numerical programs such as DANW and Rocfall, using friction rheology parameters. Simulation results such as flow velocity, flow height, final volume, potential impact area, runout distance, and energy were compared with the results of previous researches of debris flows at Morro Duas Pedras in January 2011. The results achieve recommendations to estimate impact efforts to design the protection structures against debris flows in Brazil.