Experimental Study on Behavior of Storage Water of Small Earthfill Dam just below Slope due to Inflow of Sediment

Concern for earth fill dams is particularly high in Japan because many years have passed since they were built. Some of them were constructed over 400 years ago and the number is about 200,000. Also there are the cases of the dam failures which caused by concentrated heavy rain or debris flow In Japan.

This study aims to clarify the effect of a water storage of a small earthfill dam just below a slope due to inflow of sediment. Some model experiments and numerical experiments are conducted on the some conditions. The effect of the flow number and the impounded water is considered.

As the result, the calculation value of fluid force is close to the value subtracted the maximum value on the experiments from the residual value. Inflow of sediment is absorbed due to the impound water. Same volume sediment is flowed down twice. As the result, the maximum load of the first flow is bigger than the one of the second flow. The initial flow effects to the acting load.