STUDY ON ANALYSIS OF DAMAGE FACTORS OF OPEN SABO DAM DUE TO OVERFLOW OF BOULDERS

Abstract

Recent abnormal weather conditions have resulted in large-scale debris flow, causing damage to steel pipe open Sabo dams. Particularly, unprecedented cases have been reported where the downstream components of a steel pipe open Sabo dam were damaged by overflow of boulders. It is necessary to investigate and implement measures regarding the reinforcement of downstream components and the slope of the downstream. This study analyze the factors causing damage to steel pipe open Sabo dams utilizing DEM and referring to cases of damage caused by overflow of boulders. Field boulders exceeding 1.0 m boulder were modeled, and boulder collision was examined. It is revealed that a 5.0 m boulder would accumulate near the top, repeatedly colliding with downstream components due to subsequent boulders flowing from behind, leading to their destruction. Moreover, a 5.0 m boulder would flow towards the diagonal members, causing their rapid collapse. Therefore, even in the event of overflow of boulders, it is necessary to reinforce the overflow components or employ joints capable of withstanding such conditions to prevent damage to the diagonal members.