TAKASHI SAKAMOTO

Experiments on reinforcement method of resilient bank for overflowing water

SATORU OHTSUKA

The purpose of this research is to aim for a tenacious embankment against overflow as it is reported that there are many breakthroughs due to overflow in recent years due to torrential rain. Although the river bank is a fundamental social infrastructure established for flood control, the current situation is that it is not taken into consideration for the overflow which is considered to be the most cause of the bankruptcy. It is also known that the floods that exceed the planned high water level exceeding the empirically set plan are out of the scope, moreover the embankment, which is a soil structure, often breaks down when this occurs. From the economic point of view, it is estimated that the financial ability to invest in river banks will decline in Japan in the future. Based on the current situation like these, a model experiment was conducted to propose a reinforcement method of embankment tenacious against overflow using semipermanent and low cost natural materials. From the results, it was found that by merely protecting the pavement and back side of the top end with crushed stone, it becomes tenacious against overflow. Usually, the cut-off body reaches the breakage wall due to the erosion of the legal surface due to external erosion, but by disposing the crushed stone with a large gap ratio on the decoration surface, this can be prevented by causing the over- Furthermore, it is possible to prevent landslides, landslides by soil covering. In the future, I would like to verify whether the embankment can maintain tenacity against overflow by changing overflowing water depth and flow velocity at overflow.