2022 Volume 78 Issue 2 Pages I_169-I_174
In recent years, the efficiency of rubble trimming work and the manpower shortage of divers have become problems, and the dead-weight rubble trimming method has been adopted as one of the countermeasures. However, the flow generated by falling dead-weight causes relatively small rubble to be scattered, which reduces the efficiency of the work. Since it is important to evaluate the velocity generated by falling dead-weight, this study examines the applicability of DualSPHysics to the flow generated on the rubble mound when dead-weight is dropped. The time series of the free-fall of the dead-weight was reproduced well. Reproducibility of the flow generated by falling dead-weight was good for particle size dp = 3 mm. It was also found that almost no flow occurred just below the center of the dead-weight, and that the maximum velocity occurred near the sides of the bottom plate of the deadweight. Furthermore, the maximum velocity generated at hc = 50 mm was reduced by approximately 50% compared to a drop height of hc = 300 mm.
