Effect of sampling conditions on the mechanical properties and water stability and cracking resistance of fiber reinforced soil
CHU Feng1*, CHEN Ting1, XU Chuanzhao2, LUO Jingbo2, LI Zhe1
(1. College of Urban Planning and Municipal Engineering, Xian Polytechnic University, Xian, Shaanxi 710048, China;
2. China Jikan Research Institute of Engineering Investigations and Design Co., Ltd., Xian, Shaanxi 710043, China)
Abstract：To address the issue of uneven fiber dispersion during the preparation of fiber-reinforced soils, a fluid sedimentation method was proposed. Fiber-reinforced soil specimens were prepared using both the fluid sedimentation method (referred to as the “fluid method”) and the traditional compaction method (referred to as the “traditional method”), with variations in fiber types (polypropylene, PP/polylactic acid, PLA), fiber lengths (5 mm and 10 mm), and fiber contents (0.2% to 1.0%). Unconfined compressive strength tests, slaking tests, cracking tests, and scanning electron microscopy (SEM) analyses were conducted to investigate the effects of the sample preparation method and fiber parameters on the mechanical and water stability properties of fiber-reinforced soils. The test results indicate that the fluid method disperses fibers uniformly in a three-dimensional isotropic manner through slurry adsorption. The unconfined compressive strength of the fiber-reinforced soil prepared using the fluid method is significantly higher than that of the soil prepared by the traditional method. Additionally, the PLA fiber-reinforced soil produced by the fluid method demonstrates a markedly enhanced capacity for plastic deformation. In the slaking test, the specimens prepared using the fluid method exhibit a significantly lower disintegration rate, attributed to the strong bonding of soil particles and the network confinement provided by the fibers. Notably, the PLA fiber specimens prepared by the fluid method display a “disintegration without dispersion” phenomenon. The cracking test results reveal that the PLA fiber-reinforced soil prepared by the fluid method exhibits excellent crack inhibition performance, with optimal results observed at a fiber length of 5 mm and a fiber content of 1.0%. Microscopic analysis shows that the fluid method results in finer soil particles and smaller pore volumes, with both PP and PLA fibers evenly distributed within the soil matrix. Through comparative analysis, it is confirmed that the fluid sedimentation method offers significant advantages in terms of fiber dispersion and performance enhancement. These findings provide a novel and effective solution for the preparation and engineering application of fiber-reinforced soils.
褚 峰1*，陈 挺1，徐传召2，罗静波2，李 者1. 制样条件对纤维加筋土力学特性及水稳抗裂性能影响试验研究[J]. 岩石力学与工程学报, 2026, 45(4): 1250-1265.
CHU Feng1*, CHEN Ting1, XU Chuanzhao2, LUO Jingbo2, LI Zhe1. Effect of sampling conditions on the mechanical properties and water stability and cracking resistance of fiber reinforced soil. , 2026, 45(4): 1250-1265.
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2026, Vol. 45 
