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<p>This paper studies the effect of freezing–thawing cycles on the mechanical behavior of the loess sampled from Xi'an province. The undisturbed soils, the remolded soils and 7- or 28-day lime-treated soils were respectively subjected to the freezing–thawing cycles, and the small-strain shear modulus was measured by the bender element test. Additionally, the mercury intrusion porosimetry test was conducted to analyze the change of soil microstructure before and after different freezing–thawing cycles. Results showed that the small-strain shear modulus of undisturbed soil decreased 61% after freezing–thawing cycles, but it had a significant increase after the lime improvement, and increased 115–130% as the curing ages was extended to 28&#xa0;days. The freezing–thawing cycles increased the proportion of macropores in soil samples, resulting a corresponding decrease in small-strain shear modulus of soil samples, particularly in the first three cycles; however, lime treatment decreased the soil macropores and the small-strain shear modulus of soils increased further with the curing periods extend.</p>

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The Change of Maximum Shear Modulus of Lime-Improved Soil and Its Micro-mechanism with Freezing–Thawing Cycles

  • 期刊论文

  • 发表日期：

    2025年3月6日

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  • Zheng Zhang,
  • Yejiao Wang,
  • Yuyou Yang,
  • Youwei Wang

摘要

This paper studies the effect of freezing–thawing cycles on the mechanical behavior of the loess sampled from Xi'an province. The undisturbed soils, the remolded soils and 7- or 28-day lime-treated soils were respectively subjected to the freezing–thawing cycles, and the small-strain shear modulus was measured by the bender element test. Additionally, the mercury intrusion porosimetry test was conducted to analyze the change of soil microstructure before and after different freezing–thawing cycles. Results showed that the small-strain shear modulus of undisturbed soil decreased 61% after freezing–thawing cycles, but it had a significant increase after the lime improvement, and increased 115–130% as the curing ages was extended to 28 days. The freezing–thawing cycles increased the proportion of macropores in soil samples, resulting a corresponding decrease in small-strain shear modulus of soil samples, particularly in the first three cycles; however, lime treatment decreased the soil macropores and the small-strain shear modulus of soils increased further with the curing periods extend.