Methodology to generate root analogues based on root tensile behaviour

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Root mechanical properties and geometry are crucial for predicting root-soil mechanical reinforcement. However, in terms of natural roots, the high variability challenges the repeatability of root-soil experiments for determining the key factors influencing root reinforcement. This work aims to understand the tensile behaviour of individual roots, and develop root analogues based on the tension properties for parametric studies of soil-root interactions. The experimental results indicated that under uniaxial tension loading, three typical stress-strain curves can be identified, corresponding to different tension behaviours. This variability in response can be attributed primarily to the mechanical properties of the root stele, as well as to the integrity of the bonding between the stele and cortex. Additionally, the reproducible root analogues were developed using 3D printing techniques based on the tension properties of willow (Salix purpurea L.) roots. Our preliminary tests demonstrated that resin-based prints fabricated with Stereolithography Apparatus (SLA) technology exhibited a great potential to simulate real willow roots. The development of such analogues is expected to yield useful insights for optimizing engineered plant root systems in slope stabilization.

2025 International Conference on Bio-mediated and Bio-inspired Geotechnics (ICBBG2025)

General session: Fundamental research on biogeotechnics