Numerical Analysis of the Subgrade Stress-Strain State When Strengthening the Ballast Layer with Reinforced Concrete

Abstract

In order to substantiate the design of subgrade reinforcement, an analysis of its methods was conducted. An alternative reinforcement option, one that is based on strengthening the ballast layer, was considered. Finite-element models for a two-lane subgrade, that consider geometric and deformation parameters, were created. The developed spatial model is based on real subgrade properties of the two-way railway stage that were obtained during the construction of existing embankment. A numerical analysis for non-reinforced option, as well as for concrete-reinforced option was conducted. The components of stress-strain state for both options were analyzed and their characteristic values were compared. The results of comparative analysis show a decrease by 1.1…1.13 times in vertical displacements, and by 2.6…2.8 times in compressive horizontal stresses. It is proven, that implementing a reinforced concrete strengthening of the ballast layer significantly improves the overall stress-strain state of the embankment, as it absorbs a significant part of the locomotive load.