Experimental Research on the Improvement Effect of Palm Fiber on the Shear Resistance of Cohesive Purple Soil Reinforced by EICP in Three Gorges Reservoir Area
1 Key Laboratory of Geological Hazards on the Three Gorges Reservoir Area, Ministry of Education, Yichang 443002, Hubei, China 2 College of Civil Engineering & Architecture, China Three Gorges University, Yichang 443002, Hubei, China 3 Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, Yichang 443002, Hubei, China
Abstract: In order to investigate the effect of palm fiber on the shear resistance of cohesive soil reinforced by enzyme induced carbonate precipitation (EICP), taking the cohesive purple soil in Three Gorges Reservoir Area as the research object, and 5 palm fiber dosages (0%, 0.1%, 0.2%, 0.4%, and 0.8%, in mass) combined with 5 cementing liquid concentrations (0 mol/L, 0.5 mol/L, 1.0 mol/L, 1.5 mol/L, and 2.0 mol/L) were set to carry out the direct shear test in this research. The purple soil sample without fiber and cementing fluid was used as control check (CK), and the changes in stress-strain curves, cohesion, internal friction angle and calcium carbonate content of purple soil under each experimental condition were analyzed, and the microscopic reinforcement mechanism was revealed by scanning electron microscopy. The results indicated that the cohesion and internal friction angle of the cohesive purple soil treated with fiber addition, EICP and fiber-EICP were increased by 1.63—7.54, 3.39—8.75, 0.61—18.61 times, and by 0.13—0.27, 0.12—0.20, 0.17—0.35 times, respectively, when compared with the CK treatment. Generally, the cohesion and internal friction angle had an increasing trend followed by a reduction with the increase of the fiber dosage and the cementing liquid concentrations, and the largest shear strength was observed at 0.1%—0.2% fiber dosages combined with a cementing liquid concentration of 1.5 mol/L. Compared with the CK treatment, the calcium carbonate content of EICP and fiber-EICP treated purple soil samples were increased by 11.92—21.36 and 6.77—27.39 times, respectively, and the appropriate amount of fiber incorporation promoted the generation of calcium carbonate. The microanalysis indicated that the fiber incorporated in the EICP-treated specimens formed a ‘fiber-soil particles-CaCO3’ crystal mesh structure, which could not only increase the shear strength of the specimens, but also change the damage morphology from brittle failure to plasticity failure. The results show that palm fiber can improve the shear resistance of cohesive purple soil reinforced by EICP, which can provide theoretical basis for environment-friendly biological cohesive purple soil reinforcement and ecological barrier construction in Three Gorges Reservoir Area.
肖海, 王光辉, 张伦, 张文琪, 丁瑜, 夏振尧. 棕榈纤维强化EICP加固三峡库区黏性紫色土抗剪性能试验研究[J]. 材料导报, 2025, 39(11): 24040113-6.
XIAO Hai, WANG Guanghui, ZHANG Lun, ZHANG Wenqi, DING Yu, XIA Zhenyao. Experimental Research on the Improvement Effect of Palm Fiber on the Shear Resistance of Cohesive Purple Soil Reinforced by EICP in Three Gorges Reservoir Area. Materials Reports, 2025, 39(11): 24040113-6.
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2025, Vol. 39 
