ESTIMATION METHOD AND RESULTS OF SUBGRADE STRENGTH AFFECTED BY THE TRAIN LOADS

Abstract

The main object of this study is to establish the estimation methods of subgrade strength affected by the train loads. The displacements of the surface of sleeper and subgrade are measured by HFWD (Handy type of FWD) on the opening traffic tracks.
The spring coefficients of rail support and elastic coefficient of subgrade are estimated by the displacement measured by HFWD and calculated by limited beam model analysis or multi-layered analysis. As the spring coefficient of subgrade be calculated by the original method using these coefficients, the data of the subgrade strength can be stored up.