STUDY ON FAILURE MECHANISM OF OPEN SABO DAM USING DEM

Abstract

Recently investigation reports of collapse incident concerning of Sabo structure have been reported due to large-scale debris flow. Therefore, it is required the collapse mechanism immediately, and is simultaneously validated the numerical elucidation. This study examines an application of Distinct Element Method for a classification of failure mechanism which was reported in Nagiso sabo dam. First, collapse occurrence condition experimentally investigated by using experimental models. Second, in order to reproduce constitute law of member models, under experiment collapse tests are carried out. Then, those results are modelized to the bilinear elastic-plastic law by breakage. All experimental cases are simulated by DEM, and collapse as well as no-collapse results are reproduced by the proposed DEM. The breaking mechanism of the section is analyzed in detail by examining the connect springs, i.e., axial, bending, or share, in case of structural collapse occurrence results. The analysis results indicated that joint parts of steel under stress concentration had been broken by bending force.