A coupled MPM-FDM for seepage failure analysis of saturated ground

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  • 飽和地盤の浸透破壊問題のためのMPM－FDM連成解析

Abstract

<p>Seepage failure caused by water flow under high hydraulic gradients of soil structures and natural ground is a mechanical phenomenon that can lead to serious geo-disasters. In this study, a numerical method is proposed to analyze the seepage failure phenomenon in saturated soils. Material Point Method (MPM) is used to simulate large deformation of saturated soil, and Finite Difference Method (FDM) with the Darcy-Brinkman equation is used for incompressible fluid flow incorporating seepage flow in soil. In the FDM framework, advection terms are dealt with the Rational Constrained Interpolation Profile (RCIP) scheme, and a coupled method is developed considering the interaction forces between the MPM and FDM. The developed method was first validated through a one-dimensional seepage and boiling analysis comparing with the theoretical result. Then, a seepage failure analysis around a sheet pile was performed, and the boiling phenomenon could be represented.</p>

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