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Influences of root concentration and suction on Chrysopogon zizanioides reinforcement of soil

机译：根系浓度和吸力对金鸡油菜土壤加固的影响

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摘要

The influences of root concentration and suction were investigated on Chrysopogon zizanioides (vetiver grass) root-reinforcement of clayey sand, using suction-monitored direct shear tests at four different suctions ranging from zero to 50 kPa. The vetiver grass specimens were grown in containers for about a year until they showed various root concentrations prior to testing. Of all suctions, soil samples with greater root concentrations had a higher peak strength and were more ductile than those without roots. Unsaturated root-reinforced soils contracted while the non-reinforced soils dilated during shearing. The rate of increase in root cohesion with root concentrations were highest at the suctions around 20 kPa. The rates of increase in shear strength with suction were similar for non-reinforced soils and reinforced soils up to a threshold in root concentration beyond which the rate became slightly smaller. The obtained relationships between root area ratio and strength were used in the infinite slope stability calculation of an instrumented slope based on field pore-water pressure and mini-rhizotron measurements. The analysis showed that in unsaturated condition, the stabilizing effect of suction was greater than that of roots, while in saturated condition, the stabilizing effect of root reinforcement was more important especially for shallower depth. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：在从零到50 kPa的四个不同吸力下，采用负压监测的直接剪切试验，研究了根系浓度和吸力对黏土沙金草（Chrysopogon zizanioides）根系增强的影响。香根草标本在容器中生长大约一年，直到它们在测试前显示出不同的根浓度。在所有吸力中，具有较高根部浓度的土壤样品具有比没有根部的样品更高的峰值强度，并且更具延展性。在剪切过程中，不饱和根增强土收缩，而非增强根膨胀。在20 kPa左右的吸力下，根系凝聚力随根系浓度的增加速率最高。对于非增强土壤和高达根部浓度阈值的增强土壤，吸力引起的剪切强度随吸力增加的速率相似，超过此阈值时，该速率会略微减小。根面积比与强度之间的关系被用于基于现场孔隙水压力和微型根管测量的仪器化边坡的无限边坡稳定性计算中。分析表明，在非饱和条件下，吸力的稳定作用要大于根部，而在饱和条件下，根部加固的稳定作用尤为重要，尤其是对于较浅的深度。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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