Study On The Accumulated Residual Deformation Of Weathered Granite Subgrade Soil Subjected To The Repeated Traffic Loading

As subgrade soil, the engineering characteristics of weathered granite subgrade soil is very poor, such as stability of resistance to deformation, water stability , dynamic stability. Subjected to repeated loading, excessive residual deformation can lead to the subgrade fatigue failure and deform result in lose stability. On this ground, study on dynamic property and dynamic parameter of weathered granite subgrade soil in repeated loading is quite essential.On the one hand, the test of basic behaviors, modulus of resilience under repeated loading, dynamic strength and dynamic deformation are studied in laboratory. The effect of mica content on the engineering characteristics of granite subgrade soil is studied, by separating mica from granite residual soil and forming the specimen according to different mica content, and conducting CBR test and resilience modulus test. The change mechanism of the granite subgrade soil properties is inquired.On the other hand, applying elastic theory and ANSYS program transient analysis, three-dimensional space theoretical model is established to work out dynamic stress of subgrade soil, Incorporating the relation of plastic deformation and stress learning from laboratory, in the end, the accumulated residual deformation is calculated.In addition, engineering characteristics of weathered granite cement stabilization are studied. The tests include compaction test, unconfined compression test, dynamic strength and dynamic strain test and so on. The dynamic strength and modulus of resilience of weathered granite cement stabilization have a prominent increase than weathered granite soil, weathered granite cement stabilization satisfy the condition of subgrade soil to expressway.Study on the dynamic property and accumulated plastic deformation of subgrade under repeated traffic loading have academic value and economic significance.