Addition of fibres has been recently studied as an effective method to enhance soil. To investigate the reinforcing effect of fibres on the shear strength of soil, polypropylene fibres are added into clay sample and the shear strength of clay is measured. Four different fibre contents and fibre lengths are used. The experimental results indicate that fibre content of 0.3% and fibre length of 9 mm is the optimum mix ratio. A dispersion coefficient β is proposed based on the statistical analysis on the number of fibres at a fractured interface of a test specimen. Effective fibre content and length are also proposed and further analyzed on the basis of fibres with different contents and lengths. Better fitting results are obtained by combining dispersion coefficient, effective length and fibre content. In addition, the cohesion of fibre-reinforced clay increases with an increase in the dispersion coefficient β and the effective length of fibre.

最近研究了添加纤维作为增强土壤的有效方法。为了研究纤维对土壤剪切强度的增强作用，在粘土样品中加入聚丙烯纤维并测量粘土的剪切强度。使用四种不同的纤维含量和纤维长度。实验结果表明，0.3%的纤维含量和9mm的纤维长度是最佳混合比。色散系数β基于对试样断裂界面处纤维数量的统计分析提出的。在不同含量和长度的纤维的基础上，还提出并进一步分析了有效纤维含量和长度。通过结合色散系数、有效长度和纤维含量获得更好的拟合结果。此外，纤维增强粘土的内聚力随着色散系数β和纤维有效长度的增加而增加。