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The typical fine-grained soil from the solid (soil particles), liquid (water solution), gas (gap) constitute a three-phase. In which liquid is the most complex part on the whole. Including three main parts, free water, low combined water and strong combination water. The specific content, according to the proportion of the actual conditions are different.During Soil freezing, the mainly change is happend in liquid. Free water which will be the first to freeze and cause water pressure reduce.To further reduce the temperature, a small amount of weak combined water weak there will freeze. In nature ,the soil temperature is generally not too much lower, strong combined water will always be in non-frozen. So, when soil freeze, it will show the different characteristics under different conditions.In some condition would harm the stability and strength of road base.To obtain basis information, we survey the finised roads, and doing lots of experments.Survey the finished raods,can solve the needs of time and space. Experments can offer system datas. Depend on both,give us adequate datas to analysis.Through survey the roads before winter, after winter, and continues survey during the winter.We know the types of roadbed diseases of seasonally frozen. Established the model of diseases. Authentication can use drilling survey in spring to guide roadbed diseases of seasonally. Expose the relation contract between frozen index and the deeps of frozen.Do experment to search then soil action duning freeze when some parameners change. Know woater is the most important reason when soil freezing, and make related curves.Base on this, we divide roadbed into three types,the less water roadbed, common roadbed, and more water roadbed. Adviced use method hierarchical sum to assessment roadbed frozen. And the way to control its effect.
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