Bio-Inspiration through Tree Root Pullout Tests for Innovative Anchorage Design

Burrall, Matthew; DeJong, Jason T.; Martínez, Alejandro; Wilson, Dan; Huang, Li-Chun

doi:10.1061/9780784482834.026

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…Some researchers showed contrasting results for the positive linear relationship between peak pullout force and root diameter on tree roots [17,18]. This difference is most likely due to the species difference because peak pullout force depends heavily on plant species [34][35][36][37]. In this study, because alfalfa roots belong to the taproot type, the effect of root branches was ignored.…”

Section: Frictional Characteristics Between the Roots And Soilmentioning

confidence: 84%

How Does Embedding Angle Affect Root–Soil Mechanical Interactions?

Zhang

Feng

et al. 2023

Sustainability

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Root–soil mechanical interactions are of vital importance in soil reinforcement by plant roots. However, it is unclear how the angles of the roots in the soil affect the root–soil mechanical interactions. To better understand the effect of this factor on root–soil mechanical interactions, pullout tests were conducted on alfalfa (Medicago sativa L.) roots with five root diameter groups (0.10–0.30 mm, 0.31–0.50 mm, 0.51–0.70 mm, 0.71–0.90 mm and 0.91–1.10 mm) and four embedding angles (30°, 45°, 60° and 90°) in sandy loam soil. Root tensile tests were also carried out to understand the process of root failure in the pullout tests. The results showed that the roots had two failure modes, slippage failure and breakage failure. The critical diameter of the two failure modes was 0.35 mm. Peak pullout force and pullout energy were positively related to the root diameter in power functions. Displacement was negatively related to the root diameter and embedding angle in exponential functions. Peak pullout force, root–soil friction coefficient and pullout energy all increased and then decreased with increasing embedding angles. The peak pullout force and root–soil friction coefficient reached their maximum values under an embedding angle of 60°, and pullout energy reached the maximum value under an embedding angle of 45°. Pullout energy was suggested as a preferred index of root–soil mechanical interactions for both thick/fine roots and inclined/upright roots.

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