Finite Element Simulation of the Sand Internal Erosion Considering Erosion-Mechanical Coupling
Based on the basic internal erosion control equation and the soil mechanical constitutive model,a coupled internal ero-sion and mechanics model is proposed in this paper.The model can reflect the dynamic changes of the soil physical and mechani-cal properties such as the fine grain particle content,the porosity and the pore water pressure during the internal erosion.The model is simulated by finite element method to reveal the mechanism of internal erosion,describe the characteristics of internal erosion in the process of occurrence,development and stability,and explore the change law of physical and mechanical proper-ties in the process of sand internal erosion.The erosion process can be divided into three stages:the initial erosion stage,the e-rosion process just began to develop slowly;the steady erosion stage and the erosion rapid development stage;In the erosion e-quilibrium stage,the sedimentation rate and the loss rate of fine grain particles gradually reached the same,and finally the ero-sion stopped.The internal erosion changes the physical and mechanical properties of the soil and redistributes the soil pressure,which leads to the surface settlement.The magnitude of settlement is positively correlated with the degree of erosion,and it has a great influence over the drain hole.
Internal ErosionFinite Element MethodThree-phase couplinginternal erosion mechanism
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