为研究粉砂在不同冻融循环下的应力-应变关系特性，进行了粉砂土的不固结不排水三轴剪切试验，试验结果表明：在围压较低时，未冻融及经历较少次冻融循环的粉砂表现出一定的软化性，但软化程度较弱；而经历一定次数的冻融循环后，其逐渐由弱软化型转化成硬化型；在围压较高时，未冻融及冻融以后的粉砂都表现出应变硬化的特征，其应力-应变关系曲线为典型的双曲线。基于Konder双曲线模型，概述了土体应力-应变关系中常见的几种归一化因子及相应的归一化条件。提出了针对冻融循环下粉砂土的应力-应变关系的归一化因子，并给出了相应的归一化条件。基于新的归一化因子，建立了粉砂土在不同围压、不同冻融循环次数下的应力-应变特性的归一化方程，并对应力-应变曲线进行预测，其试验值与拟合值较为接近，预测效果较好。

The unconsolidated undrained triaxial shear tests are carried out to explore the stress-strain relationship behaviors of unfrozen silty sand under different freeze-thaw cycles. Based on the test results, when the confining pressure is low, both the unfrozen silty sand or the silty sand experiencing fewer freeze-thaw cycles exhibits weak strain softening phenomenon; And stain of silty sand will change from weak stain softening to stain hardening after experiencing a certain number of freeze-thaw cycles. No matter the unfrozen silty or the frozen silty shows strain hardening under a higher confining pressure level, their stress-strain curves are both the typical hyperbola. and the normalization of the stress-strain relationship is vital to study the stress-strain properties. In this paper, four kinds of common normalization factors, which are widely adopted for unfrozen soil to study stress-strain characteristics as well as the corresponding normalized conditions, are introduced. Based on the normalization factors above, a new normalized factor is proposed to analyze the stress-strain relation of soils under freeze-thaw cycles and the normalized conditions are defined. A new normalized stress-strain equation is established to predict the stress-strain curve of silty sand under freeze-thaw cycles and confining pressures. Comparison of the prediction and test results shows that the established predict model can consider the influences of freeze-thaw cycles and has better fitting and prediction accuracy.