摘要
以某既有铁路及新建铁路并行穿越某居民区为例,对该区域的交通噪声现状进行监测分析,表明环境噪声受铁路噪声影响较大,对于临街建筑的影响为从低楼层至高楼层呈逐渐增大的趋势。考虑既有铁路和新建铁路的共同影响,建立了Cadna/A噪声预测模型,预测了采用声屏障降噪措施前后区域的环境噪声空间分布特征。结果表明,设置声屏障措施能有效减少铁路噪声的影响,预测点昼间均能达标,夜间达标率为50%,但超标点位的预测值基本相当或优于现状值。
The traffic noise of a residential area, where an existing railway and a new railway would parallelly run through, has been tested and the spatial distribution characteristics of the traffic noise had been analyzed. The results showed that the traffic noise was mainly caused by railway transportation, and it increased gradually from the lower floors to the high floors on architectures nearby the railway track. Considering the combined impact from the existing railway and the new railway, a Cadna/A noise calculation prediction model was established to predict and analyze the spatial distribution characteristics of the regional noise before and after taking the sound barrier reduction measures. It showed that the sound barriers could effectively reduce the impact of railway noise, which all predictable points could meet the environmental requirements in day-time. The night-time compliance rate is 50%, but the predicted results of those over-standard points were basically equal or better than current level.
引文
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