公路隧道壁面通风摩阻损失系数研究

发布时间：2018-07-23 13:53

【摘要】：通风是隧道在施工建设中保证安全施工和在后期运营中确保行车安全的重要前提。隧道的壁面摩阻损失系数是反映隧道通风阻力特性的重要参数之一,是隧道通风系统设计、优化改造以及技术管理等一系列工作的基础。目前,隧道壁面摩阻损失系数的测定尚未成熟,人们主要采用的是经验公式法、现场试验法等,但由于每条隧道的工程环境、支护方式、断面形状、施工单位技术水平等因素各不相同,导致计算结果与实际情况存在较大误差,最终影响隧道通风设计的实用性,给隧道建设和后期运营带来施工环境空气质量较差、能源浪费等诸多问题。本文基于隧道通风与流体力学的基本理论,通过流体力学软件Fluent模拟分析,给出隧道在不同断面形状下、不同断面面积大小的情况下,隧道所对应的壁面摩阻损失系数,进而从中找出联系和规律。并利用Fluent软件分析了壁面在不同粗糙单元高度、不同粗糙单元间距和断面直径对流体流动的影响,进一步得出相应的壁面摩阻损失系数及其规律。然后,以茅荆坝隧道通风斜井和秦岭Ⅱ号隧道项目为依托采用实测法获取其壁面摩阻损失系数,并进行三维数值模拟分析,将两种不同方法所得结果进行比对,最终得出相关结论。本文通过以上分析总结,进一步使隧道壁面摩阻损失系数的确定更加细化更具准确性,从而为隧道通风系统的设计计算和通风系统中的风量分配问题提供有益参考。
[Abstract]:Ventilation is an important prerequisite to ensure the safety of tunnel construction and traffic safety in the later stage of operation. The wall friction loss coefficient is one of the important parameters to reflect the ventilation resistance characteristics of the tunnel, and it is the basis of the design, optimization and technical management of the tunnel ventilation system. At present, the measurement of friction loss coefficient on tunnel wall is not mature, people mainly adopt empirical formula method, field test method, etc., but because of the engineering environment, support mode and section shape of each tunnel, The technical level of the construction unit is different, which leads to the large error between the calculation result and the actual situation, and finally affects the practicability of the tunnel ventilation design, and brings the poor air quality of the construction environment to the tunnel construction and the later operation. Energy waste and many other problems. Based on the basic theory of tunnel ventilation and hydrodynamics, the wall friction loss coefficient of tunnel under different cross section shape and different sectional area is given through the simulation analysis of fluid mechanics software Fluent. From which to find out the relationship and the law. By using Fluent software, the effects of the wall surface on the fluid flow at different height of the rough element, the distance between the different rough elements and the diameter of the section are analyzed, and the wall friction loss coefficient and its law are obtained. Then, based on the ventilation inclined well of Maojingba tunnel and Qinling No.2 tunnel project, the wall friction loss coefficient is obtained by using the measured method, and the three-dimensional numerical simulation analysis is carried out, and the results obtained by the two different methods are compared. Finally, the relevant conclusions are drawn. Through the above analysis and summary, the determination of friction loss coefficient of tunnel wall is further refined and more accurate, thus providing a useful reference for the design and calculation of tunnel ventilation system and the distribution of air volume in the ventilation system.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U453.5

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