在寒区工程建设中，研究含块石冻土的动力学特性是保证重大工程建设安全的前提。为了揭示冻结土石混合体在循环荷载下的力学行为，通过开展不同低温（-5 ℃、-10 ℃、-15 ℃）条件下的单轴循环荷载试验，获取了冻结土石混合体的动应力-应变关系，讨论了温度与含石量对动弹性模量的影响，探究了累积塑性应变的变化规律，并提出了相应的演化模型。结果表明：（1）冻结土石混合体的动应力-应变曲线呈现由松到紧再到松的趋势。另外，总结了不同阶段下滞回环的变化特征，发现随着循环次数的增加，首先呈现不闭合的椭圆形，接着是柳叶形，最后是扁长椭圆形。（2）随着温度的增大，动弹性模量有明显的增大趋势。当温度降至-15 ℃，动弹性模量呈现先增大后减小的趋势。随着含石量的增大，动弹性模量呈现增大的趋势。（3）累积塑性应变与循环次数存在明显的阶段性，可划分为初始变形阶段、稳定变形阶段和快速变形阶段，在此基础上提出了累积塑性应变与循环次数的改进Monismith模型，与Monismith原模型对比，可较好地拟合试验结果。并通过斯皮尔曼相关分析和偏相关分析发现，改进Monismith模型中参数b值与含石量呈显著正相关，参数a与温度呈现显著负相关性。

To ensure the safety of major engineering construction in cold regions， the study of dynamic characteristics of frozen soil containing stone is essential. In order to reveal the mechanical behavior of frozen soil-rock mixtures under cyclic loading， the dynamic stress-strain relationship of frozen soil-rock mixtures was obtained by uniaxial cyclic compression tests at different low temperatures （-5 ℃， -10 ℃， -15 ℃）. The influence of temperature and rock content on dynamic elastic modulus was discussed， and an evolution model was proposed to explain the laws of cumulative plastic strain. The results showed that the dynamic stress-strain curve of frozen soil-rock mixture developed from thinning to dense and then to thinning， and the hysteresis loops of frozen soil-rock mixture presented an unclosed elliptic shape first， then a scalded shape， and finally a flat and long elliptic shape as the number of cycles increased. Additionally， with the increase of gravel content and the decrease of temperature， the dynamic elastic modulus shows an increasing trend. There are obvious stages in the accumulation of plastic strain and the number of cycles， which can be divided into three stages： initial deformation， stable deformation， and rapid deformation， according to the growth rate of cumulative plastic deformation with the number of cycles. On this basis， an improved Monismith model was proposed to describe the cumulative plastic deformation and cycle number. The model was found to fit the experimental results better than the original Monismith model. In order to explore the relationship between parameters and experimental conditions， Spearman correlation analysis and deviation correlation analysis were used. The results showed that parameter “b” in the improved Monismith model had a significant positive correlation with stone content， while parameter “a” had a significant negative correlation with temperature. The findings suggest potential applications for this new model in predicting the behavior of materials under different conditions.