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研究目的:洁净的道床不产生冻胀,但如果道床中混入粉黏土颗粒大于12%～15%时也能产生冻胀。本文通过室内板结道床道砟中粉黏粒含量的测试,以及对不同含泥量、不同含水率下室内冻胀试验的分析,找出板结道床的冻胀特征。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 purposes: A clean track bed does not produce frost heave, but frost heave can also occur if the ballast bed incorporates more than 12% to 15% powdered clay particles. In this paper, through the test of the content of the clay in the bed bed of the indoor knot, and the analysis of the indoor frost heaving test under different amounts of mud and different water content, the frost heaving characteristics of the bed knot bed are found out. Research conclusions: Through the test of the content of the powdery clay in the bed of the roadbed in the indoor board and the analysis of the indoor frost heave test under different mud content and different water content, it is pointed out that the average rate of frost heaving caused by excessive content of the powdery clay in the roadway is generally Less than 4%, the ballast bed frost heaving is the result of the combined action of the mud content in the ballast and the water content in the ballast bed. At the same time, the effect of mud content on the frost heaving of the ballast bed should be noticed while the weak frost heaving of the ballast bed Sexual linear engineering measures harmful to the railway more than ordinary buildings, should cause enough attention.