DEVELOPMENT OF AN ANALYSIS METHOD FOR OVERTOPPIG EROSION OF RIVER LEVEES USING ELASTO-PLASTIC MPM OF SOIL

Abstract

 In recent years, Japan has experienced a series of river floods caused by levee failures. For disaster mitigation, it is necessary to precisely reproduce the progressive behavior of levees, such as seepage, overflow, and erosion by numerical analysis. In this study, the 3D flow model that can simultaneously simulate overtopping flow and seepage flow was coupled with a soil deformation model discretized by the GIMP method to establish an analytical method that can reproduce the erosion failure of the back slope due to overflow water flowing on the embankment surface. An algorithm was developed to pass the pressure in the overtopping and seepage flows and the shear force in the overtopping flow to the soil deformation model. It is shown that the algorithm can qualitatively reproduce the progression of erosion and embankment failure from the back side.