为减少寒区渠道衬砌混凝土开裂，探究水泥固化土换填原位黏土对渠道冻融变形的影响，在试件尺度和1∶1模型尺度研究了宁夏黏土和水泥固化土冻融过程的温度、变形规律。试件冻融试验表明：黏土试件冻融变形为冻胀融沉，累积膨胀量随着冻融次数增加呈线性增加的趋势，固化土冻融变形表现为热胀冷缩，且变形幅度较小，多次冻融后累积变形基本为零。1∶1渠道模型试验表明，固化土渠道的冻胀变形为黏土渠道的40% ~ 63%，冻融变形幅度为后者的28% ~ 47%，变形稳定性更优；渠底部位累积膨胀量随着冻融次数增加呈增加的趋势，与试件试验规律一致。采用固化土部分换填黏土，可以大幅降低渠道的冻胀变形和冻融变形幅度，有利于结构的变形稳定，但应注意渠坡位置的施工压实度对沉降变形的影响。

To mitigate the cracking of concrete lining in cold regions, the impact of replacing in-situ clay with cement-stabilized soil on the frost-heave deformation of channel foundations was investigated. The temperature and deformation patterns during the freeze-thaw process of Ningxia clay and cement-stabilized soil were examined in a self-made soil specimen freeze-thaw apparatus and a channel freeze-thaw model device. It is found that the freeze-thaw deformation of the clay specimens is driven by expansion upon freezing and settlement upon thawing, with the cumulative expansion demonstrating a linearly increasing trend with the number of freeze-thaw cycles. In contrast, the freeze-thaw deformation of the cement-stabilized soil specimens exhibits a pattern of contraction upon freezing and expansion upon thawing, with low deformation magnitudes and negligible cumulative deformation observed after multiple cycles. An 1∶1 scale model experiment of the channel revealed that the use of cement-stabilized soil in channel construction could reduce the amplitude of freeze-thaw deformation by more than half compared to the use of clay, thereby enhancing the resistance to frost-heave deformation. It can be concluded that partially replacing clay with cement-stabilized soil could reduce the amplitude of channel freeze-thaw deformation and thereby relieve the risk of cracking in channel concrete lining.