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<p>Freeze‒thaw cycles (FTCs) significantly influence the mechanical properties and deformation characteristics of reinforced soil, thereby constraining its engineering applications in seasonally frozen regions. In this study, low liquid limit clay in seasonal permafrost areas is examined through unconfined compressive strength (UCS) tests and unconsolidated undrained shear tests to investigate the mechanical characteristics of reinforced soil with varying numbers of reinforcement layers. The effect of the number of reinforcement layers on the compressive strength, shear strength, cohesion, and internal friction angle of reinforced soil under FTCs is analyzed in the context of strength deterioration patterns. The main stress difference and axial strain were fitted to the Duncan–Chang model and modified Duncan–Chang model. The results show that reinforcement can increase the UCS, shear strength and cohesion of the soil body via the interlocking and restraining effects of the reinforcement. Two-layer reinforcement is the most effective, but the reinforcement does not alter the original friction characteristics of the soil particles. Therefore, the influence of the angle of internal friction, which fluctuates within a range of 10°, does not follow a significant pattern. The peripheral pressure affects the reinforcement, and the effect of reinforcement on the shear strength of the soil body is greatest at a peripheral pressure of 20&#xa0;kPa, as reflected by the maximum value of the coefficient. FTCs caused by the expansion and melting of ice crystals affect soil structure and mechanical properties, resulting in the formation of penetrating cracks in unreinforced soil samples. Laying reinforcement can limit the development of these cracks, which reduces their scope and alleviates the damage caused by freezing and thawing. The Duncan–Chang and modified Duncan–Chang models can be used to predict the principal stress and axial strain of undisturbed and reinforced soils that are used in design and construction. The data fit both the Duncan–Chang model and the modified Duncan–Chang model, as indicated by the correlation coefficients, R², of 0.97, for both models. Changes in the model parameters reveal that freezing and thawing reduces strength and that reinforcement attenuates this decrease.</p>

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Experimental Study on the Mechanical Properties of Reinforced Soil with Small Spacing Under Freeze‒Thaw Cycles

  • 期刊论文

  • 发表日期：

    2025年11月15日

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  • Lina Xu,
  • Peng Zhang,
  • Yuexin Gao,
  • Junjie Zheng,
  • Shuang Sun

摘要

Freeze‒thaw cycles (FTCs) significantly influence the mechanical properties and deformation characteristics of reinforced soil, thereby constraining its engineering applications in seasonally frozen regions. In this study, low liquid limit clay in seasonal permafrost areas is examined through unconfined compressive strength (UCS) tests and unconsolidated undrained shear tests to investigate the mechanical characteristics of reinforced soil with varying numbers of reinforcement layers. The effect of the number of reinforcement layers on the compressive strength, shear strength, cohesion, and internal friction angle of reinforced soil under FTCs is analyzed in the context of strength deterioration patterns. The main stress difference and axial strain were fitted to the Duncan–Chang model and modified Duncan–Chang model. The results show that reinforcement can increase the UCS, shear strength and cohesion of the soil body via the interlocking and restraining effects of the reinforcement. Two-layer reinforcement is the most effective, but the reinforcement does not alter the original friction characteristics of the soil particles. Therefore, the influence of the angle of internal friction, which fluctuates within a range of 10°, does not follow a significant pattern. The peripheral pressure affects the reinforcement, and the effect of reinforcement on the shear strength of the soil body is greatest at a peripheral pressure of 20 kPa, as reflected by the maximum value of the coefficient. FTCs caused by the expansion and melting of ice crystals affect soil structure and mechanical properties, resulting in the formation of penetrating cracks in unreinforced soil samples. Laying reinforcement can limit the development of these cracks, which reduces their scope and alleviates the damage caused by freezing and thawing. The Duncan–Chang and modified Duncan–Chang models can be used to predict the principal stress and axial strain of undisturbed and reinforced soils that are used in design and construction. The data fit both the Duncan–Chang model and the modified Duncan–Chang model, as indicated by the correlation coefficients, R², of 0.97, for both models. Changes in the model parameters reveal that freezing and thawing reduces strength and that reinforcement attenuates this decrease.