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Vertically reinforced subgrade (VRS) the construction of which involves building backfills first and then facing walls was developed for the railroad construction in areas with land shortages, such as civil areas. VRS minimizes the land use during railroad construction and operation. It also reduces residual settlement during railway operation by virtue of its staged construction process. In this study, numerical analysis was performed to quantitatively evaluate the deformation characteristics of VRS, such as surface settlement and horizontal deformation, during the construction and operation of railroads. It was confirmed that VRS with 40 cm of vertical spacing and a reinforcement short length of 0.35H complies with the limit of residual settlement (30 mm) and horizontal deformation (less than 0.03H) for concrete slab tracks, even in the most unfavorable conditions.

Analysis of the Deformation Characteristics of Vertically Reinforced Subgrades to Address Land Shortage in Railroad Construction