Effect of Polypropylene Fibers on Rheological and Mechanical Properties of Fluid-consolidated Soil
JU Peng1,2, LEI Baofeng1,2, JI Yuyang1,2, FAN Henghui1,2,*
1 College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China 2 Institute of Geotechnical Engineering/Museum of Problematic Rock and Soil, Northwest A&F University, Yangling 712100, Shaanxi, China
Abstract: Fluid-consolidated soil is increasingly valued because of its simple preparation process and equipment, the possibility of utilising engineering spoils in the vicinity, the low cost of secondary excavation, and the high mobility and homogeneity of the soil. In this work, engineering soil, polypropylene fiber and MBER soil curing agent were used as materials to prepare fluid-consolidated soil. The effects of different fiber dosage and fiber length on the rheological and strength properties of fluid-consolidated soil and their mechanisms were investigated through the flow test, rheological test, unconfined compressive strength test and SEM-EDS test. The results show that: (1) With the increase of fiber amount and fiber length, the slurry fluidity decreases, while viscosity, plastic viscosity and yield stress increase;the correlation between fluidity, plastic viscosity and yield stress is greater than 0.65, which is strongly correlated. (2) The 7 d unconfined compressive strength of cured soil increases with the increase of fiber amount when the fiber length is 3 mm and 6 mm, and then decreases with the increase of amount when the fiber length is 9 mm, 12 mm and 15 mm;it increases with the increase of fiber length when the fiber dosage is 0.2% and 0.4%, and then decreases with the increase of fiber length when the fiber dosage is 0.6% and 0.8%. (3) The action mechanism of polypropylene fiber on fluid-consolidated soil has two main aspects:during the mixing stage, the fibers entangle with the slurry, creating friction that hinders flow; the fibers form a three-dimensional network structure that wraps around the slurry, further preventing shear deformation of the slurry. In the maintenance and shaping stage,the fibers are bonded with hydration products, which restricts the relative sliding of the fiber and the soil; the fibers form a three-dimensional mesh structure inside the soil, which restrains the deformation and displacement of the soil; the fiber round tubes are filled with hydration products, which further enhances the toughening effect of the fiber.
鞠鹏, 雷宝锋, 姬语洋, 樊恒辉. 聚丙烯纤维对流态固化土流变及力学性能的影响[J]. 材料导报, 2025, 39(20): 24080171-8.
JU Peng, LEI Baofeng, JI Yuyang, FAN Henghui. Effect of Polypropylene Fibers on Rheological and Mechanical Properties of Fluid-consolidated Soil. Materials Reports, 2025, 39(20): 24080171-8.
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2025, Vol. 39 
