Abstract
In order to explore the dynamic stress distribution, attenuation characteristics of subgrade under high-speed train load, a three-dimensional solid model was established by the ABAQUS finite element software, and the dynamic stress characteristics of subgrade of high-speed railway were calculated and analyzed. The research results show that: The distribution of additional dynamic stress on the surface of subgrade is close to elliptical, and the distribution on the cross section is similar to saddle-shaped; the peak value of stress appears below the rail. The additional dynamic stress of the subgrade has no superposition effect between the front rear bogie and the rear front bogie of the two trains. The additional dynamic stress distribution of the subgrade surface can be regarded as four stress waves that do not overlap each other. When the contact degradation shape of the subgrade gravel and the track structure concrete base is assumed to be rectangular, the aspect ratio is between 2 and 3.3. With the deterioration of the contact state, the maximum additional dynamic stress of the surface layer of the subgrade is 120 kPa.
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