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首页> 外文期刊>Plant and Soil >Influence of biopolymer gel-coated fibres on sand reinforcement as a model of plant root behaviour
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Influence of biopolymer gel-coated fibres on sand reinforcement as a model of plant root behaviour

机译：生物多聚合物凝胶涂层纤维对砂加强型植物根行为模型的影响

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AimsThe contribution of plant mucilage and microbial biofilms in the rhizosphere to the physical behaviour of roots, and therefore on geotechnical performance, is not fully understood. We explore the impact of biopolymers on the ability of fibrous inclusions in soil to resist shear loading, to test the hypothesis that biopolymer-enhanced cohesion will be most significant at shallow depths where frictional effects are less, whilst exploring the response of biopolymer to changes in the moisture regime.MethodsArtificial root/biopolymer systems comprising 3D-printed fibres and xanthan gum biopolymer in sand have been tested under direct shear at low vertical normal stress (1-30kPa). The impact of drying and wetting on the ability of the reinforced sand to resist shear was assessed.ResultsFibres combined with fresh biopolymer caused an increase in mobilisable shear stress, which is proportionally more significant at lower normal stress and so shallower depth (up to 30% increase at 1kPa). Increased shear resistance and sand aggregation were observed with progressive drying. A cyclic shear response was observed over wetting and drying cycles with considerable strengthening after drying, which was enhanced by preceding wetting increasing the biopolymer zone of influence around the fibre.ConclusionsThe behaviour of this idealised system attests that root-associated biopolymers contribute significantly to the stabilisation of shallow soil by creating bonds between the root and soil grains, but the response is dependent on the soil moisture regime.
机译：植物粘液和微生物生物膜在根际到根部物理行为的旨在贡献，因此对岩土性能，尚未完全理解。我们探讨了生物聚合物对土壤纤维夹杂物能力的影响，以抗剪切载荷，测试生物聚合物增强的内聚力在较浅的深度较少的浅层中，探讨生物聚合物的反应变化湿度制度。在低垂直正常应力（1-30kPa）下直接剪切，在直接剪切下测试包括3D印刷纤维和砂岩胶生物聚合物的方法。评估干燥和润湿对抗抗剪切抗剪切的能力的影响。结果与新鲜的生物聚合物结合导致可动性的剪切应力的增加，这在较低的正常应力下比例更显着，深度较浅（高达30％增加1kPa）。观察到渐进式抗剪切抗性和砂聚集。在润湿和干燥循环中观察到循环剪切反应，干燥后具有相当大的强化，通过前面的润湿性增加了诸如纤维周围的生物聚合物的生物聚合物区域而增强。该理想系统的特征性行为证明根系相关的生物聚合物对稳定性有显着贡献通过在根和土壤之间产生粘合来造成浅土，但响应取决于土壤湿度制度。

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