Abstract
The distortion process of the compression wave in a ballast-tracked tunnel was investigated by field measurement and numerical simulation. The field measurement was conducted in an actual Shinkansen ballast-tracked tunnel of about 4 km. The numerical simulation corresponding to the field measurement was carried out on the basis of a one-dimensional compressible flow analysis in which the effects of steady and unsteady friction were included and of an acoustic analysis on the effect of side branches. The results of the numerical simulation agreed well with those of the field measurement. It indicates that the ballast is effective for reducing pressure gradient of the compression wave generated by a high-speed exceeding 350km/h.
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