防音壁のかさ上げ延長が鉄道沿線騒音に与える影響の評価

抄録

The environmental conservation at the waysides of railway lines is one of the important issues. Noise barriers are widely used to reduce the wayside noise along railway lines. Studies on the effect of the barriers have been conducted extensively. In the studies, noise reduction due to the noise barrier with the shape of which is uniform in the longitudinal direction has been investigated. In order to further reduce the wayside noise, the noise barrier made to be partially higher. In this paper, an attempt is made to examine the effect of partial change in height of noise barrier on the wayside noise using scale model experiments. It was found that (1) the effect of partially-higher barrier on the wayside noise is more apparent at positions higher than the sound barrier and (2) the effect within the distance from the railway up to 50m is almost equal to that of a barrier with an infinite length when the total length of the partially-higher barrier is longer than 50m.