聚丙烯酰胺-剑麻纤维强化EICP对黏性紫色土体抗剪性能的影响

doi:10.11896/cldb.25040055

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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.

Key words： polyacrylamide (PAM) sisal fiber enzyme induced carbonate precipitation (EICP) soil consolidation microscopic characteristic

Published: 10 March 2026 Online: 2026-03-10

CLC number:

TU411.7

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	Articles by authors
	XIAO Hai
	ZHU Jiankang
	ZHANG Lun
	DONG Xinhui
	DING Yu
	XIA Zhenyao

Cite this article:

XIAO Hai,ZHU Jiankang,ZHANG Lun, et al. Effect of Polyacrylamide-Sisal Fiber Reinforced EICP on the Shear Strength of Cohesive Purple Soil[J]. Materials Reports, 2026, 40(5): 25040055-7.

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https://www.mater-rep.com/EN/10.11896/cldb.25040055 OR https://www.mater-rep.com/EN/Y2026/V40/I5/25040055

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