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Analysis on Moisture Migration Law in Loess Fill Subgrade

With the development of the highway construction industry in loess areas, exploring the causes of damage in loess fill subgrade has become an important topic that people have been widely concerned about. Specifically, the law of moisture migration inside the loess fill subgrade is the key to solve various loess road damage due to its special water sensitivity. Existing research has mainly focused on the influence of temperature potential and other factors on moisture migration in subgrade. However, the influence of the nature of the loess fill subgrade on the moisture migration law still lacks systematic research. In this study, a series of experiments on moisture migration in loess fill subgrade under different degrees of compaction were performed using a self-made moisture migration test device, which revealed moisture migration law in the fill subgrade. Experimental results show that water migration rate is negatively correlated with a number of wetting-drying cycle, degree of compaction, and initial water content. The final volume moisture content decreases with the increase of migration height after moisture migration is stabilized. Spaces among soil particles are small, and the soil particles are close when the degree of compaction is high. Accordingly, energy consumption for moisture migration is high, and the moisture migration decelerates. Under the same dry density condition, as the initial water content increases, the time to reach the equilibrium of water migration is shorter, and the migration rate is faster. This result also reveals that the key for controlling subgrade quality is to strictly control the degree of compaction, waterproof property, and drainage. This study can provide theoretical references to prevent damage in loess fill subgrade and waterproof the design and construction of subgrade.