To prevent from damages of frost heaving on highway subugrade in the Seasonal Frozen Zone,the law of frost heaving values distributing along the frozen depth is analyzed according to the re-sults of tests and observations .Based on the allowed deformation value of pavement,by the way of math-ematical statistics and analysis of observed data,the calculation method of allowed frozen thickness for cement and asphalt concrete pavement is proposed,too.Finally,the semi-experimental and semi-theo-retical calculation method for replacement depth of highway subgrade is proposed.In this way,the calcu-lation process is simplified conveniently to recommend the replacement depth values of subgrade under different conditions.The research achievement can provide theoretical base and practical design method for highway subgrade design and for preventing the frozen damages on pavement in Seasonal Frost Zone.%为防止季东区公路路基产生冻胀病害，依据试验和观测结果，分析了路基土冻胀量沿冻深的分布规律。基于路面容许变形值，通过对观测数据的数理统计分析，提出了水泥混凝土和沥青混凝土路面的路基容许冻层厚度计算方法。最后，提出了半经验、半理论的公路路基置换深度计算方法。采用这种方法，简化了路基置换深度的计算过程，可以方便地推荐出不同条件下路基的置换深度。论文研究成果为季冻区公路路基设计及路面冻害的防治提供了理论依据及实用的设计方法。
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