A Study on Reinforcing Quality by Settlement Recovery Module in Railroad Roadbed

Operation of trains makes continuous settlements in railway lines. Because this settlement can induce instability of a track as well as a train, displacement of a track should be controlled and repaired. In this study, a new mechanical recovery and reinforcement method; Roadbed displacement recovery module (RDRM) is suggested by modifying geogrids crushed stone column method. Numerical analysis is executed to evaluate the effect of RDRM. Various filling materials such as crushed stone, sand, soil-cement into geogrids are examined to maximize the performance of RDRM. Crushed stone as a filling material shows a great performance to strain displacement of a roadbed. In case of geogrids which is covering filling materials, a choice of construction of geogrids shows better performance to strain settlement than stiffness difference of each geogrids.