Research On Controlling And Monitoring Of The Open-source Dust During Construction Stage With CFD

With increasingly concern of the air quality of the city from public,controlling and solving the air pollution has been the important issue of the city development.According to the monitoring data,Fine particulate matter and inhalable particulate matter have been the primary pollutant of the city air.The source of the particulate matter is mostly from city traffic emission,industry emission and construction emission.The construction of the foundation and the pits of the building are of huge quantity and complicated which often contain many machinery works,heavy soil disturbance and long-terms of expose,and becomes the primary cause of the chaos and air pollution together with the earthwork construction.The dissertation takes the generation and transmission of the dust during the construction of the foundation phase.Based on the computational wind engineering(CFD)theory and urban wind engineering,the law of the generation and controlling of the dust during the construction phase is discussed using the numerical simulation method,as well as the related issues of the simulation of the wind environment during the construction phase.The main work and achievements are summarized as follows:(1)With the summary of the standards of the air pollution monitoring at home and aboard and the location setup and methods of the air pollution monitoring at home,the law of the dispersion and aggregation of the particulate matters is presented.The settlement of the particulate matters and the CAARC model are modeled with the computational fluid dynamics software,results shows that the practicability of the simulation is good,and the range of the diameter of the particulate matters of the dust is proposed.(2)Velocity vector of the ground under the condition of the fence and pits is analysis,the fence in the construction site is positive to the reduction of the flow,and can be a good influence to the reduction of dust rising from the ground and the travelling distance.(3)A simplify procedure of the satellite data of the terrain using in the CFD analysis is proposed with comparison of the measured topography and Google earth topography.Influence of the terrain on the flow is analysis which indicate that the speed-up effect wouldn’t be changed by the inlet condition of the flow.The effect can be described with dimensionless parameter.(4)The velocity vector around the Likelou project during construction period is presented with the simplified procedure modelling and analyzing strategy,the monitoring location of the project is also discussed.With the velocity vector contour of the building and the near ground,a more reasonable monitoring location is proposed.The whole procedure of modeling and analyzing is concluded.