冻害作用对公路构造物特别是对路基、路面的强度和稳定性影响很大 ,结合季节性重冰冻地区的气候特点 ,对利用粉煤灰填筑高等级公路路基的冻稳定性的影响因素进行了分析研究 ,通过室内试验及试验路观测 ,总结了粉煤灰路基冻稳定性的变化规律 ,为季节性重冰冻地区利用粉煤灰填筑高等级公路路基 ,减少环境污染 ,节省农田 ,交通建设及环境的可持续发展 ,提供了依据 The effect of frost damage has great influence on road structure, especially the strength and stability of roadbed and pavement. Combining with the climatic characteristics of seasonal heavy frozen area, the influencing factors of the frozen stability of high-grade highway subgrade filled with fly ash Analyzed and studied through the indoor experiment and experimental observation, summarized the change rule of the frozen stability of the fly ash subgrade, filled fly high-grade highway subgrade with fly ash in the seasonal heavy frozen area, reduced the environmental pollution, saved farmland, Construction and environmental sustainable development, provided the basis