G1800202 Numerical analysis on the countermeasure against micro-pressure waves by installing ballast layers in a slab-track tunnel

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  • G1800202 スラブ軌道トンネル内バラスト敷設による微気圧波対策の数値解析

Abstract

The magnitude of an impulsive pressure wave (micro-pressure wave) emitted from a tunnel portal is approximately proportional to the pressure gradient of a compression wave at the tunnel exit portal. It is confirmed that ballast layers installed in a slab-track tunnel have effect on the reduction of the micro-pressure wave by a field measurement. In this study, method of a numerical simulation is investigated for estimating the effect of the ballast layers on the reduction of the micro-pressure wave. The results indicates that the effect of the ballast layers can be simulate by calibrating a parameter of a unsteady friction term.

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