某高纬度寒区隧道施工通风热环境研究
发布时间：2019-05-24 21:33
【摘要】：在高纬度寒区隧道施工中,由于过低的温度条件,造成冬季洞内气温低,人员和机械的工作效率不高,且洞口段容易出现冻害现象。了解隧道施工通风热环境及其变化规律,是高纬度寒区隧道科学合理施工的前提。本文依托中铁隧道集团承建的某高纬度寒区隧道施工工程,采用现场调研和数值模拟的方法,对高纬度寒区隧道施工通风热环境进行研究。主要内容如下：首先,通过对位于高纬度寒区的隧道施工现场调研,了解高纬度寒区隧道施工特点、施工组织和施工工艺等热环境影响因素；通过现场测试并结合施工方提供的数据,得到隧道施工洞内气温分布、风管漏风和围岩温度分布规律；建立隧道施工通风数值计算模型并对数值模拟合理性进行验证。然后,针对数值模拟方法在隧道施工热环境研究中存在的时间步长小、计算规模大、模拟周期长,计算耗费的时间过长的问题,提出将相似原理运用到隧道施工热环境数值模拟中,通过理论分析和数值验证的方法对相似原理在隧道施工通风热环境数值模拟中的适用性进行了研究。最后,建立综合考虑风管漏风和隧道围岩的三维计算模型,利用FLUENT软件模拟隧道施工掘进过程对隧道施工通风热环境进行周期为两年的三维数值模拟研究,得到围岩温度和风管漏风对洞内气温和洞口段围岩冻结长度影响规律。
[Abstract]:In the construction of tunnel in high latitude cold region, due to the low temperature condition, the temperature in the tunnel is low in winter, the working efficiency of personnel and machinery is not high, and the freezing damage phenomenon is easy to appear in the entrance section of the tunnel. Understanding the ventilation and thermal environment of tunnel construction and its changing law is the premise of scientific and reasonable construction of tunnel in high latitude cold region. Based on the construction project of a high latitude cold region tunnel built by ZhongRailway Tunnel Group, this paper studies the ventilation and thermal environment of tunnel construction in high latitude cold region by means of field investigation and numerical simulation. The main contents are as follows: firstly, through the investigation of the tunnel construction site in the high latitude cold region, the thermal environment influencing factors such as the construction characteristics, construction organization and construction technology of the tunnel in the high latitude cold region are understood. Through field test and combined with the data provided by the construction party, the temperature distribution, air leakage and surrounding rock temperature distribution in the tunnel construction are obtained, and the numerical calculation model of tunnel construction ventilation is established and the rationality of the numerical simulation is verified. Then, in order to solve the problems of small time step, large calculation scale, long simulation period and too long calculation time in the study of tunnel construction thermal environment, the numerical simulation method has the advantages of small time step, large calculation scale, long simulation period and too long calculation time. The similarity principle is applied to the numerical simulation of tunnel construction thermal environment, and the applicability of similarity principle in tunnel construction ventilation thermal environment numerical simulation is studied by means of theoretical analysis and numerical verification. Finally, a three-dimensional calculation model considering air leakage and surrounding rock of tunnel is established, and the three-dimensional numerical simulation of ventilation and thermal environment of tunnel construction is carried out by using FLUENT software to simulate the excavation process of tunnel construction. The effects of surrounding rock temperature and air leakage on the air temperature in the tunnel and the freezing length of the surrounding rock in the entrance section of the tunnel are obtained.
【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】：U455
本文编号：2485194
[Abstract]:In the construction of tunnel in high latitude cold region, due to the low temperature condition, the temperature in the tunnel is low in winter, the working efficiency of personnel and machinery is not high, and the freezing damage phenomenon is easy to appear in the entrance section of the tunnel. Understanding the ventilation and thermal environment of tunnel construction and its changing law is the premise of scientific and reasonable construction of tunnel in high latitude cold region. Based on the construction project of a high latitude cold region tunnel built by ZhongRailway Tunnel Group, this paper studies the ventilation and thermal environment of tunnel construction in high latitude cold region by means of field investigation and numerical simulation. The main contents are as follows: firstly, through the investigation of the tunnel construction site in the high latitude cold region, the thermal environment influencing factors such as the construction characteristics, construction organization and construction technology of the tunnel in the high latitude cold region are understood. Through field test and combined with the data provided by the construction party, the temperature distribution, air leakage and surrounding rock temperature distribution in the tunnel construction are obtained, and the numerical calculation model of tunnel construction ventilation is established and the rationality of the numerical simulation is verified. Then, in order to solve the problems of small time step, large calculation scale, long simulation period and too long calculation time in the study of tunnel construction thermal environment, the numerical simulation method has the advantages of small time step, large calculation scale, long simulation period and too long calculation time. The similarity principle is applied to the numerical simulation of tunnel construction thermal environment, and the applicability of similarity principle in tunnel construction ventilation thermal environment numerical simulation is studied by means of theoretical analysis and numerical verification. Finally, a three-dimensional calculation model considering air leakage and surrounding rock of tunnel is established, and the three-dimensional numerical simulation of ventilation and thermal environment of tunnel construction is carried out by using FLUENT software to simulate the excavation process of tunnel construction. The effects of surrounding rock temperature and air leakage on the air temperature in the tunnel and the freezing length of the surrounding rock in the entrance section of the tunnel are obtained.
【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】：U455
【引证文献】
相关会议论文 前1条
1 肖益民;付祥钊;;地下空间围护结构传热热力系统划分的频率特性分析法[A];全国暖通空调制冷2006年学术年会论文集[C];2006年
，本文编号：2485194
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