季节冻土地区路基冷阻层温度场效应

为研究季节冻土地区冷阻层的路基温度场效应，基于ANSYS软件热分析原理，以粉煤灰土、橡胶颗粒改良粉煤灰土和聚丙烯纤维改良粉煤灰土3种冷阻层材料为研究对象，模拟季节冻土地区道路路基温度场，研究其阻止热量交换的效果。结果表明：采用粉煤灰土为冷阻层的道路的最大冻深为1.32 m，温度梯度最低值为-17.606℃/m；采用橡胶颗粒改良粉煤灰土为冷阻层的道路的最大冻深为0.94 m，温度梯度最低值为-23.563℃/m；聚丙烯纤维改良粉煤灰土为冷阻层的道路的最大冻深为1.20 m，温度梯度最低值为-19.557℃/m。橡胶颗粒改良粉煤灰土冷阻效果最佳，其确保路基土处于零上温度不冻结状态的最小摊铺厚度为0.33 m，适宜作为季节冻土地区的冷阻材料。

Effect on Temperature Field of Subgrade Cold Resistive Layer in Seasonal Frost Region

In order to study the temperature field effect on the cold resistance layer of road subgrade in a seasonal frozen region, based on the ANSYS software thermal analysis principle, three kinds of cold resistance layer materials (fly ash soil, fly ash soil mixed with rubber particles, and fly ash soil mixed with polypropylene fibrer) were studied through simulating a seasonal frozen soil subgrade temperature field. The biggest frozen depth of the road subgrade cold resistance layer built by fly ash soil mixed with rubber particles was 0.94 m, and its lowest temperature gradient was -23.563℃/m; The biggest frozen depth of the subgrade cold resistance layer by fly ash soil was 1.32 m,and its lowest temperature gradient was -17.606℃/m; While the biggest frozen depth of the subgrade cold resistance layer by the fly ash soil mixed with polypropylene fibrer was 1.20 m,and its lowest temperature gradient was -19.557℃/m. The cold resistance effect of the ash soil mixed with rubber particles is the best. To keep roadbed soil unfrozen, the minimum paving thickness was 0.33 m. The fly ash soil modified by rubber particle is suitable as a cold resistance material in seasonal frozen area.