城市不同类型高架快速路噪声影响

Influence of Different Types of Urban Elevated Expressway Noise

参照《城市快速路设计规程》(CJJ 129—2009)并用Cadna/A软件对3种类型的城市高架快速路进行声场模拟;对高架类型、道路限速、预测点噪声值三者进行方差分析并评判高架类型对预测点噪声值的影响程度。结果表明,高架声影区只对高度低于高架且与高架距离较近的预测点影响较大,地面道路对1~2层预测点的噪声值影响较大;双层分离式在1~8层表现出更强的噪声污染性,噪声最大值出现在第6层附近,单层分离式及整体式产生的噪声最大值所在楼层数随建筑物与高架之间距离的增大而升高,单层分离式对各楼层的噪声污染程度都较小。高架类型、道路限速对噪声值的影响显著,道路交通量的大小可以改变高架类型及道路限速对于预测点噪声的效应量大小。

According to“Specification for Design of Urban Expressway”(CJJ 129—2009),Cadna/A software was used to model three types of urban elevated expressways;analysis of variance was carried out for elevated type,road speed limit and noise value of forecast point,and the influence degree of elevated type on noise value of forecast point was evaluated.Results show that the elevated sound shadow area only affects the prediction points whose height is lower than the elevated and the distance from the elevated is close,and the ground road has a great influence on the noise value at the prediction point of 1-2 floors;the two-layer separation type shows stronger noise pollution in the 1~8 layers,the maximum noise appears near the 6th layer,the maximum noise level of single-floor separation and integral separation increases with the distance between the building and the elevated,and the single-floor separation has less noise pollution to each floor.Elevated type and road speed limit have significant influence on the noise value,and the volume of road traffic can change the effect of the type of elevated and the speed limit on the predicted point noise.