Due to that the roadbed of the high-speed railway does not allow the serious deformation, the design of filling material and its anti-frost ability have become an important technical problem in the seasonally frozen regions. According to the referring and analysis for the frost-sensitive classification and the anti-frost method of roadbed filling material in different industries at home and abroad, the frost classification of filling material of the high-speed railway roadbed which is suitable for the seasonally frozen regions in China is discussed combining the specific engineering case. Harbin-Dalian passenger special line. About 70% frost heave amount of the high-speed railway roadbed is found at the upside of underlying roadbed by measured data and analyzing the distribution of frost heave amount along the frozen depth. The result will be used to estimate the thickness of anti-frost layer. The result calculated by the finite element method shows that the maximum frozen depth using modified materials A and B is less about 20 to 30 cm than that using common materials A and B, additionally the warming in the former is quicker than that in the latter. The results above also indicate that the roadbed using modified filling materials has good effects to heat preservation and temperature rising.%由于高速铁路对变形的高要求,在季节性冻土区修筑高速铁路,路基的防冻胀问题尤为关键.通过借鉴、分析国内外各行业对地基、路基填料的冻胀敏感性分类,以及国内外公路、铁路等行业对防冻层设置的具体技术要求和工程措施,结合哈大客运专线工程具体要求,讨论适应我国季节性冻土地区高速铁路路基填料的冻胀分类的技术指标.通过现场监测数据对比分析冻胀量沿路基冻深的分布状况,发现高速铁路路基冻胀变形量的70％出现在路基基床底层上部,以此来评价防冻层设置厚度.并应用有限元法进行数值计算,结果表明,使用改性A,B组填料的路基最大冻结深度要较使用普通A,B组填料的路基小20～30 cm,同时回暖速度也快于普通路基,说明使用改性填料的路基具有良好的保温效果和升温速率.
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