半敞开式城市隧道通风口均匀布置方案研究

发布时间：2018-07-08 13:38

本文选题：城市隧道 + 均匀布置　；参考：《中南大学》2014年硕士论文

【摘要】：摘要：近年来随着我国在建城市隧道的长度逐渐加大,半敞开式隧道中通风口均匀布置自然通风方案的确定逐渐成为城市隧道建设的重点和难点之一。基于此,本文结合湖南省交通厅科研项目“城市浅埋中长隧道半敞开式自然通风关键技术研究”(201023),基于流体力学理论和自然通风隧道基本理论,运用数值模拟方法,展开了半敞开式城市隧道通风口均匀布置方案研究。主要内容如下： (1)针对半敞开式城市隧道自然通风的特征,在查阅参考文献和调研实际工程的基础上,得出影响隧道通风效果的主要影响因素。 (2)基于城市隧道通风理论和数值模拟方法,建立通风口均匀布置城市隧道模型,并将隧道内行车的模拟环境和自然环境“叠加”起来,获得不同布置方案和不同行车速度下隧道内流场的特性。 (3)在同一长度隧道和相同通风口布置方案模型下、不同长度缓冲段时,对比分析四个设计时速下流场内测点的各项数据,得到了缓冲段长度的取值范围。 (4)在隧道长度和缓冲段长度以及通风口长度相同情况下而相邻通风口之间间距不同时,对比四个设计时速下隧道内流场的变化,得到了相邻通风口间距与通风口长度的比例关系。 (5)综合整理和分析数值模拟结果,量化分析了行车速度和通风面积对半敞开式城市隧道自然通风效果的影响,由对比数据结果得到通风总面积与隧道顶面积的数量关系。
[Abstract]:Absrtact: in recent years, with the length of the urban tunnel under construction in our country gradually increasing, the determination of the natural ventilation scheme with uniform layout of the air vent in the semi-open tunnel has gradually become one of the key and difficult points in the construction of the urban tunnel. Based on this, this paper combines the scientific research project of Hunan Provincial Communications Department, "Research on the key Technologies of Semi-open Natural ventilation in shallow buried medium and long tunnels" (201023), based on the theory of fluid mechanics and the basic theory of natural ventilation tunnel, using numerical simulation method. A study on uniform layout of air vents in semi-open urban tunnels is carried out. The main contents are as follows: (1) in view of the characteristics of natural ventilation in semi-open urban tunnels, based on the reference documents and the investigation of practical projects, The main factors that influence the ventilation effect of the tunnel are obtained. (2) based on the ventilation theory and numerical simulation method of the city tunnel, the uniform layout model of the ventilation outlet in the city tunnel is established. The simulation environment and natural environment of the tunnel are "superimposed" to obtain the characteristics of the flow field in the tunnel under different layout schemes and different driving speeds. (3) under the same length tunnel and the same vent layout model, The data of four measured points in the downflow field with different lengths are compared and analyzed. The range of buffer length is obtained. (4) when the length of tunnel and buffer section and the length of vent are the same and the distance between adjacent vents is different, the variation of flow field in the tunnel under four design speeds is compared. The proportional relationship between the distance between the adjacent vents and the length of the vents is obtained. (5) the numerical simulation results are comprehensively arranged and analyzed, and the effects of driving speed and ventilation area on the natural ventilation effect of semi-open urban tunnels are quantitatively analyzed. The quantitative relationship between the total ventilation area and the top area of the tunnel is obtained from the comparison data.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U453.5

【参考文献】