市政工程施工地周边颗粒污染物扩散特征

为了解市政施工对周边大气环境的影响,通过测定TSP、PM10、PM2.5、PM1等指标,研究了施工工地附近颗粒污染物随天气条件、气象要素、距施工点距离的变化规律,结果表明：（1）粒径较大的颗粒物质量浓度受气象要素的影响较明显,大风和晴天的ρ（TSP）、ρ（PM10）远高于阴雨天;随风速增大,ρ（TSP）、ρ（PM10）、ρ（PM2.5）显著升高。（2）小粒径颗粒物（PM1）受天气条件的影响不明显,湿度、风速变化对PM1影响较小。（3）距离施工工地越远,4种颗粒物质量浓度越低,其中ρ（TSP）、ρ（PM10）、ρ（PM2.5）随距离下降较快。（4）不同施工阶段颗粒物污质量浓度异较大,挖槽阶段颗粒物污染要高于结构装修阶段。

Spatial dispersion laws of particulate matter from construction work site of municipal engineering

In order to know the influence of municipal engineering construction on peripheral region atmospheric environment,taking the urban atmosphere particulate matter parameters TSP,PM10,PM2.5,PM1,as indexes,this paper studied the density of particulate matter according to weather condition,meteorological factors,the distance to the construction work site,and the construction stage.The result indicated： 1） the particle density of big size had a relatively obvious change along with weather condition and meteorological elements.TSP and PM10 density on clear day,and with strong wind,was far higher than the overcast and rainy day.TSP,PM10,and PM2.5 density increased along with the wind speed accretion.2） the PM1 density change was not obvious along with the weather condition.The humidity and wind speed had small influence on PM1.3）.the particle density of 4 kinds indexes decreased according to the distance from the construction work site,among which TSP,PM10,and PM2.5 were more obvious.4） The different construction stage produced clearly different particles pollution,for example,the slotting stage producing more serious particle pollution than the structure repair stage.