Abstract
Stiffness of the railway subgrade is a significant factor in maintaining good track quality. The aim of the research was to develop a quick and accurate method for measuring the stiffness of railway subgrade. After a review of the stress regime in subgrade and existing measurement methods, this paper describes a novel cyclic penetration test based the California bearing ratio (CBR) test mould for assessing subgrade soil stiffness. The test reproduces stress conditions in a soil similar to those of the railway subgrade. The results show a close relationship between permanent deformation and CBR values. Based on results of the cyclic penetration tests, plastic deformation was predicted and there was good agreement between the predicted and the measured subgrade settlements.
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