%0 Journal Article %A LIU Xin %A XU Wei-neng %A HUANG Guang-jing %A LAN Heng-xing %T Large-scale Indoor Direct Shear Test on Fiber-reinforced Loess in Consideration of Distribution Effect %D 2025 %R 10.11988/ckyyb.20230841 %J Journal of Changjiang River Scientific Research Institute %P 144-151 %V 42 %N 1 %X

To investigate the effects of polypropylene fiber length, content, and distribution on loess reinforcement, a large-scale indoor direct shear test was designed for both uniform and non-uniform reinforcement schemes. In the non-uniform reinforcement, the fiber content was varied on both sides of the shear box and rammed into the soil in three layers. The curves of shear strength versus shear strain and shear strength indices of the reinforced loess were obtained. The results indicate: 1) Incorporating polypropylene fibers significantly enhances loess shear strength, with the reinforcement effect influenced by fiber length, dosage, and normal stress coupling. 2) In the uniform reinforcement scheme, a fiber length of 12 mm and a content of 0.5% achieves the best reinforcement effect. In the non-uniform reinforcement scheme, the influence range of the shear plane is less than 15 mm at normal stress of 50 kPa, slightly greater than 35 mm at 100 kPa, and further increased at 200 kPa. 3) The distribution pattern of fibers significantly impacts the reinforcement effect. Compared to a uniform 0.8% content group, non-uniform reinforcement with 0.5% content on both sides yields better results, as it avoids fiber agglomeration and ensures soil-fiber adhesion. These findings are expected to provide valuable insights for optimizing loess fiber reinforcement.

%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20230841