Based on Shuo-Huang heavy haul railway, dynamic response tests are carried out through establishing the simulated loading system of heavy haul train and full-scale model of heavy haul railway subgrade, the dynamic response characteristics of subgrade subjected to cyclic loadings are analyzed. The result indicates that with increasing axle load the dynamic stress peaks at different depths in the subgrade also increase. The larger the axle load, the greater the depth influenced by dynamic stress. There is negative exponential function between dynamic stress peak and depth in subgrade. With increasing axle load the dynamic displacement peaks at the top surface of sleeper nonlinearly increase. When axle load increases to 30t, the subgrade comes to critical failure state. This shows that by construction standard of Shuo-Huang railway subgrade, the maximum allowable axle load is about 27t, if increasing axle load, strengthening measures should be taken to subgrade preliminarily. The testing results have some reference for establishing simulated loading system of moving train and full-scale subgrade model. Meanwhile, the testing results provide better understanding of the influence of train axle load on the response of subgrade.
Key words
heavy haul railway /
subgrade /
full-scale model /
axle load /
dynamic stress
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Footnotes
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