抄録
When ballasted tracks have a high-mix ratio of fine particles, track maintenance effect by tamping is difficult to sustain because such work impairs the density of the ballast, and the initial settlement of the ballast tends to occur. In particular, in the case of the ballast with a high-mix ratio of fine particles, the settlement tends to be large because the strength of the ballast decreases in saturated condition. Therefore, we developed a repair method of sustaining the repair effect to ballasted tracks with a high-mix ratio of fine particles without the ballast renewal. In this repair method, ballasted tracks are tamped by a tie-tamper after throwing in repair material consisting of polymer and reaction material. This method prevents the strength decrease of ballast in the rain by mixing this repairing material and the ballast with a high-mix ratio of fine particles under sleepers, resulting in the reduction of the proceeds of the track settlement. In this study, the authors performed a direct shear test to evaluate the strength properties of this repairing material. The authors then performed a full-scale model test to confirm the validity of the method. The results confirmed that this technique is an effective approach to repair ballasted tracks.
