Although the dynamic properties of subgrade soils in seasonally frozen areas have already been studied, few researchers have considered the influence of shallow groundwater during the freeze-thaw (F-T) cycles. So a multifunctional F-T cycle system was developed to imitate the groundwater recharge in the subgrade during the freezing process and a large number of dynamic triaxial experiments were conducted after the F-T cycles. Some significant factors including the F-T cycle number, compaction degree, confining pressure, cyclic deviator stress, loading frequency, and water content were investigated for the resilient modulus of soils. The experimental results indicated that the dynamic resilient modulus of the subgrade was negatively correlated with the cyclic deviator stress, F-T cycle number, and initial water content, whereas the degree of compaction, confining pressure, and loading frequency could enhance the resilient modulus. Furthermore, a modified model considering the F-T cycle number and stress state was established to predict the dynamic resilient modulus. The calculated results of this modified model were very close to the experimental results. Consequently, calculation of the resilient modulus for F-T cycles considering the dynamic load was appropriate. This study provides reference for research focusing on F-T cycles with groundwater supply and the dynamic resilient moduli of subgrade soils in seasonally frozen areas.

尽管已经研究了季节性冻融区路基土壤的动态特性，但很少有研究人员考虑过浅层地下水在冻融（FT）循环中的影响。因此，开发了一种多功能的FT循环系统来模拟路基冻结过程中的地下水补给，并在FT循环后进行了大量的动态三轴试验。研究了土壤的弹性模量，包括FT循环次数，压实度，围压，循环偏应力，加载频率和含水量等一些重要因素。实验结果表明，路基的动态弹性模量与循环偏应力，FT循环次数和初始含水量呈负相关，而压实度，围压和加载频率可以提高弹性模量。此外，建立了一个考虑FT循环次数和应力状态的改进模型来预测动态弹性模量。该修改后的模型的计算结果与实验结果非常接近。因此，考虑动态载荷计算FT循环的弹性模量是适当的。这项研究为研究集中在具有地下水供应的FT循环和季节性冻结地区路基土壤的动态弹性模量提供了参考。该修改后的模型的计算结果与实验结果非常接近。因此，考虑动态载荷计算FT循环的弹性模量是适当的。这项研究为研究集中在具有地下水供应的FT循环和季节性冻结地区路基土壤的动态弹性模量提供了参考。该修改后的模型的计算结果与实验结果非常接近。因此，考虑动态载荷计算FT循环的弹性模量是适当的。这项研究为研究集中在具有地下水供应的FT循环和季节性冻结地区路基土壤的动态弹性模量提供了参考。