大型互通立交隧道火灾烟气迁移规律及控制研究

发布时间：2018-04-13 02:34

本文选题：互通隧道 + 通风阻力　；参考：《西南交通大学》2015年硕士论文

【摘要】：近年来,随着中国公路路网的大力建设,公路隧道因其具有优化公路直线性、减少行车距离等优势,公路隧道被大量的应用到公路路网建设中。随着隧道建造技术的发展,大型互通立交隧道逐渐在公路隧道中出现。因为互通立交隧道在结构形式上存在着隧道的汇合与分岔,在隧道发生火灾时,尤其是在分岔处发生火灾时,对火灾烟气的迁移规律及对火灾烟气的控制势必与传统单管隧道不同。本文以深圳市过境高速公路连接线工程为依托,利用Fluent数值模拟软件,对大型互通立交隧道通风阻力以及发生火灾时的烟气迁移规律及控制进行了研究分析。本文首先查阅了相关文献,结合前人的研究成果,分析了大型互通立交隧道的结构特征,确定大型互通立交隧道火灾烟气迁移规律及控制研究的重点是大型互通立交隧道通风气流阻力分析,火灾烟气迁移规律研究和大型互通立交隧道火灾临界风速影响因素分析。其次,由于隧道通风阻力是影响整个隧道的通风性能和效果的一个重要因素。因此,全面的、系统的分析和研究隧道通风阻力是非常重要的。本论文运用Fluent软件,对长大互通立交隧道通风系统的各个细部进行三维数值模拟分析和研究。主要内容包括：不同断面直线隧道的沿程阻力、不同断面曲线隧道的沿程阻力、车行横通道开启时的局部阻力、隧道分岔处的局部阻力。然后,基于深圳东通道连接线工程隧道具有隧道的汇合与分叉的特点,火灾发生时的烟气场与速度场势必与传统单管隧道不同,因此运用Fluent软件,对深圳东通道连接线工程隧道在不同火灾情景下的烟气分布规律、温度分布规律与速度分布规律进行了分析和研究。通过使用20MW火源,分析了不同断面直线段隧道、隧道分岔处合流与分流时的临界风速以及烟气场、温度场与速度场,为长大互通立交隧道通风系统设计提供具体参数。最后,将大型互通立交隧道的分岔口进行合理简化,忽略了隧道的曲线变化,运动局部分析的方法,分别采用5MW、20MW和50MW火源研究分析了分岔角度、分岔上下游横截面积比和分岔处连拱长度对火灾烟气控制的影响。
[Abstract]:In recent years, with the construction of highway network in China, highway tunnel is widely used in highway network construction because of its advantages of optimizing highway straightness and reducing driving distance.With the development of tunnel construction technology, large interchange tunnel appears gradually in highway tunnel.Because there is a confluence and bifurcation in the structure of the interchange tunnel, when the tunnel fire occurs, especially when the fire occurs at the bifurcation,The law of fire smoke migration and the control of fire smoke are bound to be different from the traditional single tube tunnel.In this paper, based on Shenzhen transit highway connecting line project, the ventilation resistance and smoke migration law and control of large-scale interchange tunnel are studied and analyzed by using Fluent numerical simulation software.In this paper, we first refer to the relevant documents and analyze the structural characteristics of large interchange tunnels, combining with the previous research results.In order to determine the fire smoke migration law and control of large interchange tunnel, the key points are the analysis of ventilation air flow resistance, the study of fire smoke migration law and the analysis of the factors affecting the fire critical wind speed of large interchange tunnel.Secondly, ventilation resistance is an important factor affecting ventilation performance and effect of the whole tunnel.Therefore, comprehensive, systematic analysis and study of tunnel ventilation resistance is very important.In this paper, the three-dimensional numerical simulation and research on the ventilation system of long-long interchange tunnel are carried out by using Fluent software.The main contents are as follows: the resistance along the tunnel with different cross sections, the resistance along the tunnel with different section curves, the local resistance at the opening of the vehicular cross passage, and the local resistance at the bifurcation of the tunnel.Then, based on the characteristic of confluence and bifurcation of tunnel in Shenzhen East Tunnel, the smoke field and velocity field will be different from the traditional single-tube tunnel when the fire occurs. Therefore, Fluent software is used.The distribution law of smoke, temperature and velocity of the tunnel of Shenzhen East Corridor connecting Line under different fire conditions are analyzed and studied in this paper.By using 20MW fire source, the critical wind speed, flue gas field, temperature field and velocity field of tunnel with different cross sections and bifurcation are analyzed, which provide specific parameters for the design of ventilation system of long and long interchange tunnel.Finally, the bifurcation of the large interchange tunnel is reasonably simplified, the curve change of the tunnel is ignored, and the method of motion local analysis is used. The bifurcation angle is analyzed by using 5MW 20 MW and 50MW fire source, respectively.The influence of cross sectional area ratio of upstream and downstream of bifurcation and the length of multiple arch at bifurcation on fire smoke control.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U458

【参考文献】