SEEPAGE FLOW ANALYSIS OF DOUBLE LAYER FOUNDATION AROUND A RIVER LEVEE WITH THE USE OF A SIMPLE MATHEMATICAL MODEL

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  • 簡易なモデルを用いた複層状堤防周辺地盤の浸透流解析

Abstract

<p> Since the seepage flow around river levees is one of the causes of bank breach and an important engineering problem, many studies have been conducted in the field of geotechnical engineering and river engineering since long time ago. As the system of equations of seepage flow is relatively simple, and numerical simulation is not so difficult, most problems can be numerically solved. The present study uses the Dupuit-Forchheimer type simple model to analyze the seepage flow around river levees with double-layer foundation in order to elucidate the basic physical mechanism. With two-layer foundations, the piezometric head in protected lowlands and the risk of piping increases with decreasing the ratio of the permeability of the upper layer to that in the lower layer and the extent of the permeable layer. It is theoretically found that the permeability of river levees increases the piezometric head in protected lowlands.</p>

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