ABSTRACT
This chapter presents the details of new equipment, field installation, and monitoring procedures along with records of measurements. The site investigation was carried out to investigate the condition of subgrade and comprised of eight test pits and eight Cone Penetrometer tests. To measure cyclic stresses and deformations in the track, robust and high precision instruments were used at the site. The pressure cells were installed by excavating beneath the sleeper up to the bottom of the capping layer and then backfilled at the appropriate levels, with care taken to avoid any damage during placement and subsequent material compaction. Track deformation is considered to be a primary indicator for predicting track strength, life, and quality. Excessive deflection causes accelerated movements and breakage of ballast. To investigate the overall performance of the ballast layer, the average vertical deformation and average vertical strain are considered by taking the mean of measurements taken under the rail and the edge of sleeper at each interface.
