成都市建筑扬尘扩散规律研究

Study on the Dispersion Laws of Building Construction Dust in Chengdu

为了研究成都市建筑扬尘的环境影响,通过对成都市范围内2016年不同施工阶段的建筑施工工地进行调研以及实地采样,统计了施工场地外界5~100m范围内建筑扬尘浓度变化,研究了不同施工源强下扬尘水平扩散的规律。结果表明,当施工扬尘浓度> 0.65 mg/m^3时,水平扩散常数为916.5 mg/m,等效逸散初始距离为29.92m;当施工扬尘浓度在0.15~0.65 mg/m^3之间时,水平扩散常数在1 066.3~1 847.6 mg/m之间,等效逸散初始距离在37.2~61.2m之间;当施工扬尘浓度≤0.15 mg/m^3时,水平扩散常数在411.1~718.3 mg/m之间,等效逸散初始距离在63.6~95.7m之间;施工扬尘浓度越大,等效逸散初始距离越短。扬尘浓度随距离的增加而递减,在80~100m处达到平衡;建筑扬尘扩散浓度与施工工地源强有关,源强越大,在相同距离、相同高度的建筑扬尘浓度越高,等效逸散初始距离越短,但水平扩散常数差异不大。

In order to study the environmental impact of building construction dust in Chengdu,based on the investigation and field sampling of construction sites in different construction stages in Chengdu in 2016,this paper made a statistical analysis of the variation of dust concentration in the range of 5~100 meters outside the construction site,and studied the law of horizontal diffusion of dust under different construction sources.The results showed that when the dust concentration is more than 0.65 mg/m^3,the horizontal diffusion constant is 916.5 mg/m and the equivalent initial distance of dissipation is 29.92m.When the dust concentration is between 0.15~0.65 mg/m^3,the horizontal diffusion constant is between 1066.3~1847.6 mg/m,the equivalent initial distance of dissipation is between 37.2~61.2 m.When the dust concentration is less than 0.15mg/m^3,the horizontal diffusion constant is between 411.1~718.3 mg/m,the equivalent initial distance of dissipation is between 63.6~95.7 m.The higher the dust concentration,the shorter the equivalent initial distance of dissipation.The dust concentration decreases with the increase of distance and reaches balance at 80~100 meters.The diffusion concentration of building dust is related to the source intensity of construction site,and the higher the source intensity is,the higher the concentration of building dust at the same distance and height is,the shorter the initial distance of equivalent dissipation is,but there is little difference in the horizontal diffusion constant.