植物根系分布形态及含根复合土强度特性试验

根系空间分布形态对含根复合土体抗剪强度影响显著。近年来快速发展的透明土试验技术为非嵌入式可视化观测植物根系分布形态提供了技术支撑。基于Carbopol Ultrez 10制配成透明黏土材料，开展高羊茅、香根草两种植物根系生长过程中的分布形态观测研究；并与植物在天然砂土与天然黏土中的根系生长长度进行对比分析。继而，开展高羊茅植物根系分别在水平、竖直、倾斜、相交及混合等分布形态下含根复合土体的十字板剪切试验，探讨最优含根量、根系增强效应系数以及表层加筋效应等问题。试验结果表明，透明黏土材料中最优含根量约为0.35%，混合分布形态下根系增强效应最明显，根系增强效应系数约为1.4～1.5。

Strength properties of root compound soil and morphological observation of plant root

The spatial distribution of the root system has a significant effect on the shear strength of the composite soil. In recent years, the rapid development of the transparent soil test technology provides suitable technical support for visual observation of plant root distribution. Based on the transparent clay manufactured by Carbopol Ultrez 10, the distribution patterns of two plant root systems (tall fescue and vetiver) were visually observed in the growing processes. The growth of rhizomes in natural sand and natural clay was also carried out for comparative analysis. Based on the vane shear test method, the strengths of tall fescue root reinforced composite soil with different spatial distributions (such as vertical, inclined, intersect and mixed) were measured in detail. The optimum root content, root enhancement effect coefficient, and surface reinforcement effect were also discussed. The results show that the optimal root content in the transparent clay material is about 0.35%, and the root enhancement effect coefficient of the mixed root system is the largest, about 1.4-1.5 under this experimental condition.