为研究根土相互作用,量化草本植物根系对土体抗剪强度的增强作用,以Wu和Waldron提出的根系固土模型为基础,考虑根系分布剪切方向、锚固作用长度和有效根数量3个因素,提出了改进模型,对草本植物加筋模型进行改进优化,并利用该模型研究根系与剪切面初始夹角、根系直径等对固土能力的影响。结果表明:改进模型能够很好地拟合试验结果;随着根系与剪切面夹角的增大,逆斜交根系对土体的加筋贡献值先增大后减小,顺斜交根系对土体的加筋贡献值先为0后增大最后减小;随着根系直径的增大,不同分布角度的根系对土体的加筋贡献值均增大,且大致呈正比例关系。

To investigate root-soil interaction and quantify the enhancement of soil shear strength by herb roots, an improved root-soil reinforcement model based on Wu and Waldron’s model was proposed by integrating three key factors: root distribution shear direction, anchorage length, and effective root number. The enhanced model was employed to examine the impact of the initial angle between the root and the shear surface, as well as root diameter, on soil reinforcement capacity. Results indicate that the improved model accurately fits the experimental data. Specifically, with the increase of the angle between root and shear plane, the reinforcement contribution of inversely oblique roots increases first and then decreases, while that of forward oblique roots increases first from zero and then decreases. Furthermore, with the increase of root diameter, the contribution of roots with varying distribution angles to soil reinforcement increases, roughly exhibiting a proportional relationship.