FLOW OUT LIMIT OF BACK-FILLING SAND BEHIND REVETMENT UNDER CYCLIC LOADING OF WATER PRESSURE

摘要

Many hydraulic structures collapse due to flow out of the back-filling sand behind a revetment under attack of flood and stormy waves. This type of destruction caused by the cavity behind the revetment is closely related to the cyclic loading of water pressure acting on the sand surface around the structure. In this study, we investigated the basic characteristics on the flow out of back-filling sand under the cyclic loading of water pressure by using two experimental apparatuses. It is shown that the cyclic seepage force which occurs around the revetment plays an important role to the flow out of back-filling sand. Furthermore, an analysis of the sand bed stability potential against the flow out of back-filling sand is presented, in which alinost the experimental cases tested in this study are verified.