When the roadbed filling of subgrade is mixed with different contents of clay particles under diverse moisture contents,it shows weak frost heaving property which will in turn cause a relative heavy frost heaving of the roadbed itself.According to the sieve analysis of silty clay in the roadbed,and the frost heaving test under different moisture contents,the paper points out that the frost heave ratio due to different silty clay contents is less than 4 ％,and one of the main solutions to prevent frost heaving of roadbed surface is to keep it clean.%在路基中,道床混入一定含量的粉粘土颗粒时,在不同含水率条件下会表现为弱冻胀性,而道床的弱冻胀性会产生相对较大的冻胀量.通过室内道床中不同粒径的粉粘土颗粒含量的测定,以及不同含水率下室内冻胀试验的分析,指出道床因粉粘土含量引起的冻胀率一般小于4％,清洁道床是防止道床表层冻害的主要措施之一.
展开▼
