Numerical Simulation Analysis on Dynamic Stress of Railway Subgrade under Heavy Haul Condition

In current, high-speed and heavy haul has become the development tendency of railway transportation from all over the world. The key of heavy haul railway transportation is to increase the axle load and the number of train formation. However, the current axle load in China is generally much lower than that in many other countries. Further researches on sub grade´s dynamic response rule and working performance under large axle load are lack. This paper focuses on the feature of heavy haul train loading. By using the finite element numerical calculation based on ABAQUS, sub grade dynamic stress with different axle loads are analyzed, including peak value and spatial distribution characteristics of dynamic stress. The influence law of axle load and adjacent wheel base is discussed. Moreover, the vertical attenuation coefficient curve of dynamic stress is acquired. The conclusions can be used as references for reinforcement of existing sub grade or design of new sub grade.