Study on feasibility of the subgrade filled with weathered phyllite

To ensure the stability of the subgrade filled with weathered phyllite, we conducted a study on a new field test method of wetting deformation of the subgrade filled with weathered phyllite. On the foundation of the analysis on the physical and mechanical properties of the weathered phyllite, we evaluated the feasibility of the subgrade filled with weathered phyllite. We put up test section in the eastern Ankang section of the highway from Shiyan to Tianshui, took bearing plate field tests before and after immersion on the test road, analyzed the mechanism of the subgrade wetting deformation, got the result that wetting deformation is directly proportional to amount of water infiltration and resulted in the attenuation of bearing capacity of subgrade. Through the analysis of the results, we gave a further evaluation of the feasibility of the subgrade filled with weathered phyllite.