路基饱和粉质黏土冻胀规律试验研究

Experimental Study on Frost Heaving Law of Saturated Silty Clay in Subgrade

对取自某路基的粉质黏土进行室内试验,展开不同偏应力、围压和冷端温度等复杂环境下的粉质黏土冻胀试验。试验结果表明:饱和粉质黏土的冻胀率与时间之间成对数型函数关系,冻胀前期,冻胀率发展较快,冻胀后期,冻胀率发展较慢;冻胀率与温度高低和应力大小相关,偏应力越大,围压越大,温度越高,冻胀率发展越缓慢;通过试验数据建立饱和粉质黏土的冻胀率经验模型,该模型可以很好地预测饱和粉质黏土在复杂环境下的冻胀发展规律。研究结果可为工程提供借鉴和参考。

The frost heaving test of silty clay from a roadbed was carried out under different deviator stress,confining pressure and cold end temperature.The results show that the relationship between the frost heaving rate of saturated silty clay and time is logarithmic function.In the early stage of frost heaving,the frost heaving rate develops rapidly,and in the late stage,the frost heaving rate develops slowly.The frost heave rate is related to temperature and stress.The larger the deviator stress is,the larger the confining pressure is,and the higher the temperature is,the slower the frost heave rate develops.Based on the experimental data,an empirical model of frost heaving rate of saturated silty clay is established,which can predict the development law of frost heaving of saturated silty clay in complex environment.The research results can provide reference for engineering.