为了研究冻融循环对石灰改良黄土边坡的稳定性影响，通过直剪试验和土水特征试验获得了石灰改良黄土在不同冻融循环次数下的抗剪强度和土水特征变化规律，并利用MIDAS GTS NX软件采用强度折减法分析高填方黄土边坡的稳定性。结果表明：土样的内摩擦角和黏聚力都随着养护龄期的增加而增加，随着冻融循环次数的增加，土样的内摩擦角会先增加后逐渐趋于平稳，而黏聚力会先下降后逐渐趋于平稳；石灰改良黄土在第一次冻融循的最低温度时其基质吸力最大，第二次冻融循环时，其基质吸力最小，其后土体的基质吸力有所提高。冻融循环会造成边坡渗透流速的增大；冻融边坡模型的孔隙水压力变化趋势与未冻融边坡相同，孔隙水压力在边坡模型底部为正值，靠近边坡顶部逐渐减小，至坡顶为最小值。冻融循环会造成边坡在降雨工况下的应变增大，影响边坡的安全稳定性；浅层冻融对于高填方改良黄土边坡安全性影响很小。

In order to study the effect of freeze-thaw cycle on the stability of lime-amended loess slope, the change rule of shear strength and soil-water characteristics of lime-amended loess under different numbers of freeze-thaw cycles was obtained by straight shear test and soil-water characteristics test, and the stability of high-fill loess slope was analysed by using the strength discount method with MIDAS GTS NX software. The results show that: the internal friction angle and cohesion of the soil samples both increase with the increase of the age of maintenance, and with the increase of the number of freeze-thaw cycles, the internal friction angle of the soil samples will first increase and then gradually tend to be stable, and the cohesion will first decrease and then gradually tend to be stable; the lime-amended loess has its matrix suction maximum at the lowest temperature of the first freeze-thaw cycle, and its matrix suction is minimum at the second freeze-thaw cycle, and after that the matrix suction of the soil body increased. Freezing and thawing cycles will cause the slope infiltration flow rate to increase; the trend of pore water pressure changes in the freezing and thawing slope model is the same as that of the unfrozen slope, and the pore water pressure is positive at the bottom of the slope model, and then decreases gradually near the top of the slope, and then reaches the minimum at the top of the slope. The freeze-thaw cycle will cause the strain of the slope to increase under rainfall conditions, which affects the safety and stability of the slope; the shallow freeze-thaw has little effect on the safety of high-fill improved loess slopes.