THE RAILWAY ROADBED STABILIZATION METHOD WITH PERMEABLE SLAG MORTAR

Abstract

 In railroad ballast track, train loads can cause localized settlement of the ballast track at locations where the roadbed stiffness is lower than that of the adjacent section. In such cases, the roadbed stiffness should be increased by improving the roadbed because maintenance frequency tends to increase. In urban areas where nighttime train construction time is short, roadbed improvement using permeable slag mortar may be used because it can be constructed in a short period of time. However, there is no method to calculate the thickness of roadbed improvement, and a predetermined thickness of roadbed improvement has been set regardless of the roadbed conditions. In this study, a roadbed improvement method using permeable slag mortar was applied to the boundary of a structure to determine the target value of roadbed displacement caused by train loads and to design a roadbed improvement thickness that satisfies the target value. The roadbed improvement was implemented based on the designed roadbed improvement thickness, and the progress of high and low displacement before and after the roadbed improvement was evaluated.