Discrete element method for clay considering irregular planar shape of clay platelets

SHEN Zhi-fu; ZHANG Xu-yin; GAO Feng; WANG Zhi-hua; GAO Hong-mei

doi:10.11779/CJGE202209010

Volume 44 Issue 9

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Chinese Journal of Geotechnical Engineering > 2022 > 44(9): 1654-1662. > DOI: 10.11779/CJGE202209010

SHEN Zhi-fu, ZHANG Xu-yin, GAO Feng, WANG Zhi-hua, GAO Hong-mei. Discrete element method for clay considering irregular planar shape of clay platelets[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(9): 1654-1662. DOI: 10.11779/CJGE202209010

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Discrete element method for clay considering irregular planar shape of clay platelets

School of Transportation Engineering, Nanjing Tech University, Nanjing 210000, China

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Received Date: July 21, 2021
Available Online: September 22, 2022

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Abstract

Abstract

The discrete element method (DEM) is a powerful tool to study the microscopic mechanics behind the complicated macroscopic mechanical behaviors of clay. In the current DEM simulations of clay, the planar shape of clay platelets is commonly assumed to be regular, such as rectangle and ellipse, which are quite different from the true planar shapes of clay. There is no research report about the effects of shape of clay platelets on the mechanical behaviors of clay. In this study, the methods to calculate the Van der Waals force and the double-layer repulsive force between two convex-shaped clay platelets are proposed, and an inter-clay platelet contact model is developed. Then, the effects of relative alignment of two clay platelets on the interactions are studied, and the approaches to significantly improve the simulation efficiency are summarized accordingly. The DEM simulation for clay based on irregular convex planar shape of clay platelets is thus developed. The simulated results indicate that the developed DEM simulation scheme can well reproduce the mechanical behaviors of clay in oedometer tests. The planar shape and thickness of clay platelets have significant effects on the one-dimensional compressive curves and the evolution of platelet arrangement fabric. It is necessary to incorporate the irregular planar shape of clay platelets in future DEM simulation of clay.
- clay,
- discrete element method,
- Van der Waals force,
- double-layer repulsive force,
- shape of clay platelet

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References

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