109 / 2025-04-24 12:56:08

Quantification of the Seepage-Induced Internal Erosion

Internal erosion, the migration of fine particles within a soil matrix due to seepage flow, is a critical process that can compromise the stability of geotechnical structures such as dams, levees, and embankments. This study investigates the effects of confining pressure, initial fines content, and flow velocity on the erosion process and the resulting changes in soil properties. Through a series of laboratory seepage tests, the evolution of fines content, void ratio, and volumetric strain under different conditions is analyzed. A predictive equation for fines content is proposed, incorporating the influence of initial fines content, normalized flow velocity, and normalized confining pressure. Additionally, the relationship between cumulative fines loss and erosion-induced volumetric strain is quantified using a hyperbolic tangent function, providing a robust model for predicting volumetric changes. The post-erosion void ratio is estimated by considering both cumulative fines loss and volumetric strain, offering a comprehensive framework for understanding the mechanical behavior of internally eroded soils. The results highlight the significant role of confining pressure in controlling fines loss and the heterogeneity of eroded soils along the flow direction. This study provides valuable insights for assessing and mitigating internal erosion in geotechnical structures, contributing to the development of more resilient infrastructure.