MECANISMS OF PIPING PROGRESS IN RIVER LEVEE FOCUS ON THE DEFORMATION IN THE FOUNDATION GROUND AND THE LOCALIZATION OF SEEPAGE FLOW BY SHEET-PILE INSTALLATION

Abstract

 In this research, model experiment and seepage flow analysis were carried out to clarify the mechanisms of piping by sheet-pile installation. As a result, from the model experiment, sheet-pile installation had the effect of delaying piping hole penetration by suppressing the deformation of the foundation ground, although it was difficult to prevent the occurrence of sand volcano. From the seepage flow analysis, it was found that the rapid increase of seepage flow velocity to the tip of piping hole was one of the triggers of the levee breach due to piping hole penetration, and the sheet-pile installation prevented this effect.