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: To further improve the challenges of brittle failure and stress concentration caused by uneven fiber dispersion existing in enzyme induced carbonate precipitation (EICP) technology, the synergistic effects of polyacrylamide (PAM)-sisal fiber reinforced EICP on the shear perfor-mance of cohesive purple soil were investigated. Cohesive purple soil from the Three Gorges Reservoir area (TGRA) was selected as the research subject. Experimental parameters included sisal fiber content (0%, 0.2%, in mass percentage), PAM concentration (0.0 g/L, 0.5 g/L, 1.0 g/L, and 1.5 g/L), and cementation solution concentration (0.0 mol/L, 0.5 mol/L, 1.0 mol/L, and 1.5 mol/L), and unreinforced soil samples (CK) were taken as control check. Direct shear tests were conducted; the stress-strain curves, cohesion, internal friction angle, and calcium carbonate content under different treatments were systematically analyzed to evaluate the impact of PAM-fiber integration on the shear performance of EICP-reinforced soil. Microstructural characterization was further performed to elucidate the reinforcement mechanisms. Results demonstrated that, compared to CK, fiber-EICP, PAM-EICP, and PAM-fiber-EICP treatments increased cohesion by 29.89%—94.19%, 35.82%—144.93%, and 37.89%—149.66%, respectively, and improved internal friction angle by 9.83%—18.99%, 5.04%—15.06%, and 5.49%—17.24%, respectively. The maximum cohesion (38.22 kPa) was achieved at 1.5 g/L PAM, 0.2% fiber, and 1.5 mol/L cementation solution, while the highest internal friction angle (21.53°) occurred at 0.0 g/L PAM, 0.2% fiber, and 0.5 mol/L cementation solution. Additio-nally, a statistically significant exponential relationship (P＜0.05) was observed between cohesion and calcium carbonate content, indicating that carbonate cementation was the primary contributor to the enhancement of cohesion. Microstructural analysis revealed that PAM formed a cohesive network encapsulating soil particles, carbonate precipitates, and fibers while filling interparticle pores. This dual mechanism not only enhanced soil strength but also mitigated brittle failure by improving ductility. These findings demonstrate that the integration of PAM and sisal fiber effectively optimizes the shear resistance of EICP-treated cohesive purple soil, providing a theoretical foundation for eco-friendly soil stabilization and ecological protection strategies in the TGRA.
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2026, Vol. 40 
