Abstract
Cyclic load by train causes subsidence of railway level in tunnels, which is due to ground deformation under roadbed concrete. In consideration of progress of track irregularities and core drilling results, the deformation of the roadbed concrete have been evaluated, but there has been no quantitative inspection method until the present. In this study, to develop a method for quantitative evaluation of train running stability on the slab placed on roadbed concrete, a method to survey roadbed concrete by vibrating it with small-sized and medium-sized vibration exciter was proposed. Vibration characteristic of roadbed concrete with accelerometers fixed near the vibration position was also evaluated. Then the correlation between progress of track irregularities considered to be correlated with the soundness of roadbed concrete and the results of vibration tests was confirmed, and a method for evaluation of the correlation was proposed.
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