Abstract：In order to analyze the technical feasibility of coal gangue mixed with soil as fillings of road embankment，the mechanical behaviors of coal gangue samples mixed with soil were studied by the consolidated undrained triaxial dynamic tests. For coal gangue with mixed soil samples，ratios of dry weight of coal gangue to that of soil are prepared with 4∶1，3∶1，and 2∶1，respectively. The results of dynamic strength tests indicate that dynamic stress sd of gangues mixed with soil increases with the proportion of soil；and there exists an optimum ratio between 3∶1 and 4∶1. The dynamic stress-strain curves can be fitted by hyperbolic curve；the dynamic hyperbolic model and its parameters are also obtained. The maximum dynamic modulus increases with the increase of confining pressure in the relation of exponential function through regression. All of these results can be used to analyze the stability of the coal gangue embankment under traffic load and its deformation. To further verify the results of indoor tests，an in-situ experiment was performed in actual road；and its ground deflections were determined. It is found that the strength of coal gangue mixed with soil as filling can meet the requirements of road embankment.
