Gravel soil is the commonly used railway and highway subgrade filling in Xinjiang. In order to control and reduce settlement of embankment,it should be firstly confirmed that the change law of influencing factors on the gravel soil roadbed accumulative deformation under cyclic loading. The effect of confining pressure,the initial static deviatoric stress,cyclic loading frequency,cyclic loading value and consolidation ratio on cumulative plastic strain of gravel soil was investigated through the dynamic triaxial tests. The accumulative deformation increases with the increasing value of initial static deviatoric stress and the cyclic loading; however,it shows an opposite trend with the increase of confining pressure,cyclic loading frequency and consolidation ratio. At the same time,the cumulative plastic strain range under different influencing factors was calculated and their impact on the cumulative plastic strain were obtained. Thus in the subgrade construction,increasing confining pressure and consolidation ratio of gravel soil subgrade can be adopted to reduce operation settlement. A new model of gravel soil cumulative plastic strain arming at small plastic deformation was put forward and the correctness of the model was validated. The research results can provide reference for the design and construction of gravel soil subgrade in Xinjiang.
Journal of Railway Science and Engineering
static deviatoric stress