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<p>In cold andseasonally frozen regions, soils undergo significant changes due to alternating freeze-thaw cycles (FTCs). In this study, we investigate the dynamic response of low-compressibility silt subjected to FTCs (0, 1, 2, 4) and six stages of step-up strain-controlled dynamic loading, unlike existing studies that primarily focused on sands and clay-dominated soils subjected to single-stage stress-controlled dynamic loading. Maximum degradation of dynamic properties was observed after 2 FTCs, and a small recovery was observed after 4 FTCs. Dynamic shear modulus (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:G\)</EquationSource> </InlineEquation>), damping ratio (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:D\)</EquationSource> </InlineEquation>), degradation index (<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\:\delta\:\)</EquationSource> </InlineEquation>), and energy dissipation (<InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\:W\)</EquationSource> </InlineEquation>) showed reductions of 67.53%, 63.88%, 60.00%, and 63.35%, respectively, up to 2 FTCs under single-stage cyclic loading with a strain amplitude of 0.5&#xa0;mm. Specimens subjected to 2 FTCs and step-up staged cyclic loading, <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(\:G\)</EquationSource> </InlineEquation> reduced by 93.85%, while <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\:D\)</EquationSource> </InlineEquation> decreased by 63.89% at a strain amplitude of 0.5&#xa0;mm, and increased by 41.42% at a 4.0&#xa0;mm strain amplitude. The findings reveal a detrimental effect of repeated FTCs on the dynamic behaviour and structural integrity of the soil, offering new experimental insights into the cyclic response relevant to earthquake and traffic-induced loading in cold regions.</p>

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Effect of Freeze-thaw Cycles and Step-up Staged Loading on Dynamic Properties of Low-compressibility Silt

  • 期刊论文

  • 发表日期：

    2026年6月26日

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  • Abid Ahmad Sofi,
  • Majid Hussain

摘要

In cold andseasonally frozen regions, soils undergo significant changes due to alternating freeze-thaw cycles (FTCs). In this study, we investigate the dynamic response of low-compressibility silt subjected to FTCs (0, 1, 2, 4) and six stages of step-up strain-controlled dynamic loading, unlike existing studies that primarily focused on sands and clay-dominated soils subjected to single-stage stress-controlled dynamic loading. Maximum degradation of dynamic properties was observed after 2 FTCs, and a small recovery was observed after 4 FTCs. Dynamic shear modulus ( \(\:G\) ), damping ratio ( \(\:D\) ), degradation index ( \(\:\delta\:\) ), and energy dissipation ( \(\:W\) ) showed reductions of 67.53%, 63.88%, 60.00%, and 63.35%, respectively, up to 2 FTCs under single-stage cyclic loading with a strain amplitude of 0.5 mm. Specimens subjected to 2 FTCs and step-up staged cyclic loading, \(\:G\) reduced by 93.85%, while \(\:D\) decreased by 63.89% at a strain amplitude of 0.5 mm, and increased by 41.42% at a 4.0 mm strain amplitude. The findings reveal a detrimental effect of repeated FTCs on the dynamic behaviour and structural integrity of the soil, offering new experimental insights into the cyclic response relevant to earthquake and traffic-induced loading in cold regions.