ABSTRACT
The field measurements are used for the calibration of constitutive models and their successive implementation in the finite element method, capturing the elasto-plastic deformation characteristics of ballast and reinforced by geogrid. A comprehensive knowledge of the complex mechanisms associated with track deterioration is essential for the accurate prediction of a typical track maintenance cycle. Various simplified analytical and empirical design methods have been used in the past to estimate settlements and stress transfer between the track layers. An illustration depicts the percentage of Atternberg limit, unit weight, and undrained shear strength obtained from in-situ Vane test for plastic limit, liquid limit and water content. Due to time constraints, the rail track was built immediately after installing prefabricated vertical drains. The train load moving at a very low speed was used as the only external surcharge. The equivalent dynamic loading using an impact load factor was used to predict the track behaviour.
