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The bed protection works around the hydraulic structures like dam and bridge piers are usually collapsed due to disasters of sinking into the sand and transporting of sands around its bed protection works specially during flood flow. Disasters of protection works are declined the function and the stability of important hydraulic structures, and they are the factors of utterly destruction of the hydraulic structures. So, it is very important problem in hydraulic engineering to clarify destruction mechanisms of bed protection works and to propose disaster prevention measure.In this study, we take up the phenomenon of sand removal from bed protection works considered to be a main cause of disasters. To examine such a phenomenon, an experimental flume model was used to conduct a set of experiments subjected to water pressure variation. The experimental results found good to be able to explain the effect of water pressure variation.

EFFECT OF WATER PRESSURE VARIATION ON SAND REMOVAL FROM BED PROTECTION WORKS