Abstract
Aims
This study aims to comprehensively examine the shear behavior of rooted soil mixtures at both macroscopic and microscopic levels.
Method
The research utilizes the discrete element method (DEM) to investigate the shear behavior of rooted soil mixtures through two-dimensional biaxial tests conducted under the membrane boundary condition. The samples were meticulously prepared, with variations in both the volume fraction of roots and soils. The roots were modeled as multiple bonded rigid blocks, enabling them to undergo deformation when subjected to external forces.
Results
From a macroscopic perspective, the rooted samples display deviatoric stress and volumetric strain curves that illustraY. Huangte the stress-strain relationship during shearing. On a microscopic level, the coordination number (representing the contact number per particle) of the rooted soil samples, along with the anisotropy of contact force orientations, serves as valuable descriptors of the evolving microstructures during shearing. Furthermore, the formation of shear bands exhibits variations depending on the content of roots within the samples.
Conclusions
The study findings demonstrate that the macroscopic behavior of rooted soils is influenced by multiple factors, including the volume fraction of the mixtures, stiffness, and aspect ratio of soil particles and roots. These findings highlight the intricate and interdependent nature of the mechanical properties within the root-soil mixture. Additionally, it is observed that a higher volume fraction of roots results in a more complex formation of shear bands, further indicating that the mechanical response of the root-soil mixture is significantly influenced by the presence of roots.
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Data availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
We gratefully acknowledge the financial support provided by the National Natural Science Foundation of China NO. 51978159, NO. 51608112, and the Fundamental Research’Funds for the Central Universities NO.2242023K40018.
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Huang, Y., Ding, J., Sun, W. et al. Evaluating the shear behavior of rooted soil by discrete element method simulations in two dimensions. Plant Soil 493, 355–373 (2023). https://doi.org/10.1007/s11104-023-06234-w
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DOI: https://doi.org/10.1007/s11104-023-06234-w