PERFORMANCE OF THE REINFORCED RAILROAD ROADBED OF CRUSHED STONES UNDER THE SIMULATED CYCLIC LOADING USING MULTI PURPOSE LOADING SYSTEM

초록

Conventional railroad roadbeds construted with soils in the past can deteriorate with time due to the increase of repeated traffic loading, increase of train speed, built-up of ground water on the roadbed and decrease of permeability in the roadbed layer, etc. In this study, performance of reinforced railroad roadbeds with the crushed stones was investigated through the real scale roadbed with the numerical analysis. It was found through the actual testing that for the roadbed with the same thickness, the displacement of reinforced roadbed decreases with the increase of subgrade rection modulus. The settlement of reinforced roadbed with the same subgrade reaction modulus also decreases with the increase of thickness of the reinforced roabed. As a conslusion, the plastic and elastic displacement of the crushed stone reinforced roadbed was found to be mainly elastic displacement of the crushed stone roadbed was foundto be mainly governed by the subgrade reaction modulus.