ANALYSIS OF DAMAGE CASE CONCERNING STEEL PIPE OPEN SABO DAM USING DEM

Abstract

Recently investigation reports of collapse incident concerning steel pipe open sabo dam have been reported due to large-scale debris flow. These were disaster incident caused by the impact of debris flow that exceeds the design load. It is required to estimate the design load of structures that can withstand large scale debris flow, in order to study the limit states and failure mechanism of steel pipe open sabo dam. The study validated the failure mechanism to analyze the reproduction of the damage case in distinct element method. Then, the constitutive law of the steel pipe is determined by the section division method. In addition, analysis is conducted using the modified flow velocity distribution model that applied the infiltration flowrate between the sediment gravel. This result show that the top of a steel pipe open sabo dam is affected by the steel pipe connections and especially the compressed deformation steel pipes are the main cause.