摘要
以CFD数值模拟为研究方法,研究了不同施工围栏高度对施工扬尘迁移扩散的影响规律。选取了4种施工围栏高度进行研究,分别为1.8,2.2,2.5,3.0 m。选取速度分别为3,5,8,12,15 m/s的来流风均匀流过不同围栏高度的施工场地,研究场地内风场情况以及施工扬尘的迁移扩散规律。结果表明:在土方区域背风面,来流风形成回流,不利于扬尘向外扩散。在土方区域迎风面,施工扬尘随上升流扩散到工地其他区域,造成扬尘污染。1.8 m的围栏围成的施工工地,施工扬尘相比其他围栏高度围成的施工场地,会更多的扩散到外界环境中,2.2 m高的围栏围成的施工工地施工扬尘扩散到外界环境相对较少,二者差距最大可达7.4%。不过随着风速的增大,围栏高度防止扬尘扩散到外界的作用越来越小。
Based on the method of CFD numerical simulation,it was studied the effects of different fence heights on migration and diffusion of construction dust. Four different fence heights,1. 8 m,2. 2 m,2. 5 m and 3. 0 m were selected,and 5 wind speed levels,3 m / s,5 m / s,8 m / s,12 m / s and 15 m / s through the construction site were used,and it was studed the wind field in construction sites and the law of migration and diffusion of construction dust. The results show that in the leeward of earthworks,back flow happens and it can cause dust pollution. In the windward of earthworks,upstream carries dust to other areas in sites,which can cause dust pollution. The construction dust of construction sites around 1. 8m fences is much easier to disperse into external environment compared to others,the construction dust of construction sites around 2. 2m fences is harder to disperse into external environment,and the maximum difference is 7. 4%. With the increase of wind velocity,the effect of different heights' fences preventing dust into external environment becomes less.
出处
《环境工程》
CAS
CSCD
北大核心
2014年第4期83-86,共4页
Environmental Engineering
基金
国家"十二五"重大科技支撑计划项目(2012BAJ03B03-02)
上海市研究生创新基金项目(JWCXSL1202)
关键词
CFD
施工围栏
施工扬尘
围栏高度
外界环境
CFD
construction fence
construction dust
fence height
external environment
