IMPACT LOAD OF WOODY DEBRIS ACTED A STEEL PIPE OPEN SABO DAM

Abstract

This paper elucidates the reduction mechanism of an impulsive load of debris flow with driftwood utilizing the proposed distinct element method. In addition, the efforts were visualized contact force transmission mechanism inside the woody debris of analysis results by using con-tact force distribution illustration and velocity vector one. In the results, driftwood concentrated at the front part of woody debris is entrapped by an open sabo dam, and the proposed method was able to reproduce the load time relation obtained in the experiment. In addition, the driftwood functions as cushioning material, and the function reduced impulsive load of debris flow received from the subsequent flow of debris flow. It was found that the impulsive load of debris flow including driftwoods was smaller than that of bouldery debris flow.