2023 Volume 79 Issue 17 Article ID: 23-17134
In recent years, the efficiency of work accompanying work style reform has become an issue, and dead-weight-type riprap leveling has been adopted for riprap leveling. However, there is a concern that the flow on the rubble mound caused by the falling dead-weight will scatter small rubble stones on the top surface, reducing work efficiency. As a countermeasure, we focused on reducing the generated flow velocity by providing holes in the weight. The purpose of this study is to clarify the phenomenon of the flow velocity generated by the dead-weight riprap leveling with the improved weight by examining model experiments, numerical calculations, and field demonstrations. From the measurement of the generated flow velocity in model experiments and the results of numerical calculations, it was found that by dispersing the flow into the upward flow, the horizontal flow, the flow that permeates the permeable structure, and the generated flow velocity could be reduced. The field demonstration tests of the implemented construction also confirmed that the generated flow velocity was reduced.
