소형동평판재하시험을 이용한 자갈궤도강성 예측방안

초록

Ballast track is a flexible track system, so is applicable to relatively weak ground but requires continuous maintenance because of track irregularity induced by the deformation. It is well-known that track rigidity is directly related to the track irregularity. In this regard, light weight deflectometer (LWD) was applied to measure quasi-track stiffness on every single sleeper. The quasi-stiffness changes periodically from low to high. The low stiffness appears to indicate unsupported sleepers and high value means supported ones. Therefore, the change of quasi-stiffness seems to be associated with track irregularity. Load displacement relationship can also provide information whether the sleeper is supported or unsupported.