Monitoring and Analysis of Moisture and Temperature of Silty Soil Subgrade in Seasonally Frozen Region

Silty soil is between fine-sand soil and powder soil,the moisture in the subgrade which filled with silty have a large range,and have a relationship with the changing of humidity of the subgrade in a negative temperature conditions will aggravate the subgrade freezing.In order to understand the changing of soil subgrade's temperature and moisture in seasonal frost region,using self-developed monitoring facility consummates the roadbed moisture and temperature data,the results show that: in the freezing process of the roadbed,under the effect of temperature,more to the accumulation of the phenomenon of migration of the upper roadbed,more significant;in different depths of the subgrade.as temperature and water are different,freezing unit thickness(ie 0.2m) of soil is different in the time required;embankment slope exists due,subgrade soil from the slope at the temperature slightly above the road subgrade soil temperature which close to the midline,shorter time required to freeze the latter.The results further understand the moisture content and temperature variation and freezing-thawing process of silty soil subgrade,in order to further study the subgrade freezing silt provides theoretical support.