湿热地区长大隧道温湿度场分布及洞壁结露分析

发布时间：2018-01-11 21:36

本文关键词：湿热地区长大隧道温湿度场分布及洞壁结露分析　出处：《铁道学报》2017年07期 　论文类型：期刊论文

【摘要】：以某铁路隧道为依托,选取其中8座典型隧道,对隧道洞壁温度、洞内气温以及相对湿度进行连续观测并整理分析。基于ABAQUS有限元软件建立隧道的流固耦合数值模型,得到了洞口风速、隧道长度和进风口风温等因素对长大隧道温度场的影响规律。在此基础上,对湿热环境下长大隧道洞壁结露现象产生机制进行了分析。研究结果表明:长大隧道温湿度场可分为快速变化区、平缓过渡区和恒定区,在恒定区内隧道温度、湿度变化受外界环境影响较小。湿热气候下的洞壁结露现象主要是由于较高的内外温差和大气湿度引起的。洞口风速与隧道恒定区大小呈线性关系,且风速越大,恒定区范围越小。在洞外气温相同的情况下,隧道越长,洞内气温衰减越快,而洞外气温仅对隧道口一定区域产生影响。
[Abstract]:With a railway tunnel, select one of the 8 typical tunnel, the tunnel wall temperature, the air temperature and relative humidity were observed and analyzed. The numerical model of coupled finite element software ABAQUS to establish the tunnel flow based on the influence of the length of the tunnel entrance velocity, and temperature and other factors on the wind tunnel temperature field. On this basis, the tunnel wall condensation mechanism of hot and humid environment were analyzed. The results show that: the tunnel temperature and humidity field can be divided into the fast changing area, smooth transition zone and constant area, tunnel in constant temperature region, humidity changes affected by the external environment. Smaller wall condensation the phenomenon of hot and humid climate is mainly caused by difference in temperature and atmospheric humidity higher. There is a linear relationship between the size of the wind tunnel and the constant region, and the wind speed is large, constant area The smaller the outside temperature. Under the same condition, the tunnel is long, the temperature decay more quickly, and the hole in the outdoor air temperature only on the tunnel mouth area of influence.

【作者单位】：东北大学资源与土木工程学院;中铁九局集团有限公司宇松指挥部;中国铁路设计集团有限公司城市轨道交通设计研究院;
【基金】：国家自然科学基金(51578116)
【分类号】：U456
【正文快照】： 随着铁路网的快速发展,铁路隧道尤其是长大隧道也日益增多。由于当地气候、隧道构造、通风条件等因素影响,既有隧道洞壁时常产生返潮结露现象。长大隧道中隧道洞壁潮湿造成隧道内环境的恶化,隧道如果长期处于这种环境下会加快钢轨锈蚀,使二衬混凝土结构的耐久性降低,降低轨道

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