中文摘要：

为量化分析在基础施工阶段工地内的扬尘分布情况,选取南宁市环境空气质量实时发布系统公布数据作为对比标准,测量2015年10月到2016年1月间南宁某教学楼工地内细颗粒物PM2.5和可吸入颗粒物PM10数值量。将测得数据对数转化,减少数据变异性,使其接近正态分布,并选取置信度为95%的数据。对PM2.5及PM10排放量提取主成分表示排放强度。依据排放强度,将工地内位置用系统聚类分成三类。结果显示：1工地内排放强度最大一类区域为钢筋加工棚,挖掘机工作区,挖掘机破碎锤工作区,水泥搅拌区。利用独立样本T检验对分类效果进行检验,得到分类效果良好。2排放强度最大一类区域PM10与PM2.5排放量呈极强正相关（R~2=0.838）,即两种污染物具有相同的污染源。3对排放强度与气象因素进行相关性分析,得到基坑周围、工人生活区、道路边、桩机和水泥车周围排放强度和温度呈显著正相关和湿度呈显著负相关,扬尘主要来源于颗粒物扩散。

英文摘要：

In order to study the dust distribution of construction sites in foundation projects,PM2. 5and PM10 weremeasured in a construction site in Nanning,Guangxi province,during October 2015 to January 2016. The air quality dataprovided by The Nanning City Ambient Air Quality Live Weather Station are selected as a comparison. Logarithmic transformed figureswith confidence level of 95%were selected. A principal component calculated from PM2. 5 and PM10 emissions is regardedas the emissions intensity. By system clustering,the location of site will be divided into three types according to the emissions intensity. The results showed： 1 steel process site,excavator workspace,percussion bit workspace,and cement mixing zone were the most polluted area in the site. The classification was effective according tothe T-test onthe independent samples. 2 PM10 and PM2. 5 emissions hada strongly positive correlation in the most polluted areas（ R2= 0. 838）,andtherefore the two kinds of pollutants hadthe same pollution sources. 3 Correlation analysis was carried out on theemissions intensity and the meteorological factors,and the emissions intensity and the temperature were significantly positively related. The emissions intensity has a significantly negative correlation with the humidity around the foundation,worker living quarters,roadside,pile machine and cement truck,thus the pollution in these areas mainly comes from dust particle diffusion.