To embrace sustainable and environmentally friendly practices, sisal fibers have emerged as a green and low-carbon alternative, offering a viable approach for enhancing the physical characteristics of frost-vulnerable soils. In this study, the unconfined compressive strength and freeze-thaw cycle (FTC) tests for soils stabilized with sisal fiber were conducted, and the enhancement mechanism of sisal fibers on soils in cold regions was analyzed. The results showed that as the sisal fiber content raised, the unconfined compressive strength of the soil samples initially increased and then decreased, which reached a peak at 0.9% sisal fiber content. The heat flux in the sisal fiber-reinforced soil samples exhibited a more dramatic variation than that in the soils without adding fibers during the water-ice phase transition stage. The unfrozen water hysteresis in the fiber-reinforced soil samples initially decreased and then increased as the soil temperature decreased. With an increase in the FTCs, the frost heave for sisal fiber-reinforced soil samples occurred, whereas settlement appeared in the soils without adding fibers. The cumulative deformation of sisal fiber-reinforced soil samples was lower than that of the soils without adding fibers. Additionally, the thaw settlement rate was lower than that of frost heave rate for sisal fiber-reinforced soil samples, while the reverse results were occurred for the soils without adding fibers. The addition of sisal fibers established a more robust structural integrity to the soils.

中文翻译：

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减轻用剑麻纤维加固的土壤的冻胀


为了采用可持续和环保的做法，剑麻纤维已成为一种绿色和低碳的替代品，为增强易受霜冻土壤的物理特性提供了一种可行的方法。本研究对剑麻纤维稳定土壤进行了无侧限抗压强度和冻融循环 （FTC） 试验，分析了剑麻纤维在寒冷地区土壤上的增强机理。结果表明：随着剑麻纤维掺量的增加，土样的无侧限抗压强度先增加后降低，在剑麻纤维掺量0.9%时达到峰值。在水-冰相变阶段，剑麻纤维增强土样品中的热通量比未添加纤维的土壤中的热通量表现出更剧烈的变化。随着土温的降低，纤维增强土样品中的未冻结水滞后先减小后增加。随着 FTC 的增加，剑麻纤维增强土样品发生了冻胀，而土壤中出现了沉降，而没有添加纤维。剑麻纤维增强土样的累积变形低于未添加纤维的土样。此外，剑麻纤维增强土样的融化沉降速率低于冻胀速率，而未添加纤维的土壤则相反。剑麻纤维的添加为土壤建立了更坚固的结构完整性。