NUMERICAL ANALYSIS OF VERTICAL STRESSES TRANSFERRED FROM THE BALLAST TO THE SUBGRADE

초록

Ballast and sleeper were simulated by using the discrete element method(DEM). The developed DEM algorithm can create circular elements of various radii and line elements to be changeable length. Three kinds of numerical distributions (i.e. random, normal and logarithmic normal distributions) are realized to characterize the ballast size distributions in the algorithm. The vertical stresses transferred from the ballast to the subgrade under displacement controlled loading condition were computed for the random ballast size distribution.