讲座摘要：Suffusion, as a manifestation of internal erosion, refers to the migration and detachment of fines within the void spaces amidst coarse particles under the action of seepage. The coexistence of solid-fluid multiphases, hydraulic-mechanical multifield, and macro-micro multiscale in suffusion poses a significant challenge in conducting comprehensive analyses for granular soils affected by erosion. In this study, a thorough examination is undertaken to review the fundamental principles and numerical solutions for hydromechanical modelling of suffusion, focusing on a continuous medium perspective. Firstly, granular soils are considered as a combination of three phases and five components, and the mathematical governing equations for each component, including mass balance and pore fluid flow, are presented based on mixture theory. Subsequently, a constitutive model representing the behaviour of gap-graded granular soils is introduced. Modifications are made to incorporate the effect of suffusion on the mechanical behaviour, including non-linear elasticity and adjustments to the critical state line (CSL) based on the fine content. Finally, different numerical methods used for hydromechanical coupling, including finite difference method (FDM), finite element method (FEM), smoothed particle hydrodynamics (SPH), and material point method (MPM), are summarized. Their implementation in erosion-related boundary value problems is also illustrated. This study provides a basic understanding of the theory of hydromechanical modelling considering suffusion and the fundamental theory for the main approaches to realizing continuous simulations of erosion.