Easy Detection and Dynamic Behavior of Unsupported Sleepers in High speed Ballasted Track

초록

Unsupported sleepers are not fully contacted between sleepers and the ballast, which could cause large dynamic forces on the high speed ballasted track. Unpredictable dynamic forces may affect the stability of running train. These also accelerate track irregularities and deteriorate track components rapidly. Consequently, the unpredictable dynamic forces lead to a dramatic increase in terms of track maintenance cost. This paper introduces an easy method to detect unsupported sleepers with portable light falling weight deflectometer(LFWD). In addition, numerical simulation of discrete element method is performed to identify stress transfer mechanism of the ballast with unsupported sleepers.