研究结论:通过室内板结道床道砟中粉黏粒含量的测试，以及不同含泥量、不同含水率下室内冻胀试验分析，指出了道砟中由于粉黏粒含量超标引起的冻胀率一般小于 4%，道床冻胀是道砟含泥量和道床内含水率共同作用的结果，在做好防排水的同时还要注意到含泥量对道床冻胀的影响，道床的弱冻胀性对铁路线性工程措施危害性大于普通建筑物，应引起足够的重视。

Research conclusions: By testing the silt content in interior hardened ballast and analyzing for frost heaving tests with different clay and water content，it states that the frost heaving rate is generally less than 4% when the silt content in ballast exceeds standard，and the frost heaving of ballast is the result of a combination of silt content and water content， so proof and drainage system must be good meanwhile effect of silt content on frost heaving should be paid attention to． The harmfulness of weak frost heaving behavior for ballast linear engineering treatment is greater than normal structures，and more attention should be paid．