Skip to Main content Skip to Navigation
Conference papers

Numerical modelling of suffusion by discrete element method: A new internal stability criterion based on mechanical behaviour of eroded soil

Abstract : Non-cohesive soils subjected to a flow may have a behavior in which fine particles migrate through the interstices of the solid skeleton formed by the large particles. This phenomenon is termed internal instability, internal erosion or suffusion, and can occur both in natural soil deposits and also in geotechnical structures such as dams, dikes or barrages. Internal instability of a granular material is its inability to prevent the loss of its fine particles under flow effect. It is geometrically possible if the fine particles can migrate through the pores of the coarse soil matrix and results in a change in its mechanical properties. In this work, we uses the three-dimensional Particle Flow Code (PFC3D/DEM) to study the stability/instability of granular materials and their mechanical behavior. Kenney and Lau criterion sets a safe boundary for engineering design. However, it tends to identify stable soils as unstable ones. The effects of instability and erosion, simulated by clipping fine particles from the grading distribution, on the mechanical behaviour of glass ball samples were analysed. The mechanical properties of eroded samples, in which erosion is simulated and gives a new approach for internal stability. A proposal for a new internal stability criterion is established, it is deduced from the analysis of relations between the mechanical behaviour and internal stability, including material contractance.
Document type :
Conference papers
Complete list of metadatas

https://hal-centralesupelec.archives-ouvertes.fr/hal-02460158
Contributor : Kamilia Abdani <>
Submitted on : Wednesday, January 29, 2020 - 8:26:01 PM
Last modification on : Wednesday, July 8, 2020 - 11:10:22 AM

Links full text

Identifiers

Citation

Nadjibou Abdoulaye Hama, Tariq Ouahbi, S. Taibi, Hanène Souli, J.-M. Fleureau, et al.. Numerical modelling of suffusion by discrete element method: A new internal stability criterion based on mechanical behaviour of eroded soil. 8th International Conference on Micromechanics on Granular Media, Powders and Grains 2017, Jul 2017, Montpellier, France. ⟨10.1051/epjconf/201714010011⟩. ⟨hal-02460158⟩

Share

Metrics

Record views

47