火灾高温下公路隧道衬砌结构损伤研究
发布时间：2018-07-31 05:15
【摘要】：公路隧道火灾具有温度高、升温速率快、热量难以散发等特点，一旦发生不但造成重大的人员伤亡与财产损失，还会对隧道结构与设施造成极大的破坏。因此，研究火灾高温下衬砌结构的温度场与热应力，对衬砌结构的损伤程度与安全性作出评价具有重要意义。 本论文主要作了以下几方面的工作： （1）利用流体软件PHOENICS模拟得到了不同火灾强度不同通风风速下隧道内烟气温度场的分布情况，选取离火源不同距离的隧道断面，建立了各断面拱顶温度—时间曲线，作为衬砌温度场模拟的热荷载。 （2）利用大型有限元分析软件ANSYS，在热传导理论的基础上，采用随温度变化的热工参数，，合理选择边界条件，对不同火灾强度不同隧道断面下的复合式衬砌温度场进行了模拟，研究了隧道二次衬砌温度场的分布规律。 （3）利用地层—结构法，在上述衬砌结构温度场的基础上，对各工况下衬砌结构的热应力进行了模拟计算，研究了隧道二次衬砌在无隔热条件下热应力的分布规律以及一定安全系数下的损伤时间与损伤深度。 （4）在前人试验成果的基础上，总结了火灾后隧道衬砌结构损伤检测与评价的方法以及提高隧道衬砌结构耐火性能的方法。
[Abstract]:Highway tunnel fire has the characteristics of high temperature, fast heating rate and difficult heat emission. Once it occurs, it will not only cause heavy casualties and property losses, but also cause great damage to the tunnel structure and facilities. Therefore, it is of great significance to study the temperature field and thermal stress of lining structure under fire and high temperature to evaluate the damage degree and safety of lining structure. The main work of this paper is as follows: (1) the distribution of flue gas temperature field in the tunnel with different fire intensity and ventilation wind speed is obtained by using fluid software PHOENICS, and the tunnel section with different distance from the fire source is selected. The temperature-time curves of the domes of each section are established as the thermal loads simulated by the lining temperature field. (2) based on the theory of heat conduction, the thermal parameters varying with the temperature are adopted by using the large-scale finite element analysis software ANSYS. The temperature field of composite lining under different fire intensity and different tunnel section is simulated by reasonable selection of boundary conditions, and the distribution law of temperature field of tunnel secondary lining is studied. (3) the stratigraphic structure method is used to simulate the temperature field of composite lining under different fire intensity and different sections. On the basis of the temperature field of the lining structure mentioned above, the thermal stress of the lining structure under various working conditions is simulated and calculated. The distribution law of thermal stress and damage time and damage depth of tunnel secondary lining under the condition of no heat insulation are studied. (4) based on the previous experimental results, The methods to detect and evaluate the damage of tunnel lining structure after fire and to improve the fire resistance of tunnel lining structure are summarized.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451.4;U459.2
本文编号：2154531
[Abstract]:Highway tunnel fire has the characteristics of high temperature, fast heating rate and difficult heat emission. Once it occurs, it will not only cause heavy casualties and property losses, but also cause great damage to the tunnel structure and facilities. Therefore, it is of great significance to study the temperature field and thermal stress of lining structure under fire and high temperature to evaluate the damage degree and safety of lining structure. The main work of this paper is as follows: (1) the distribution of flue gas temperature field in the tunnel with different fire intensity and ventilation wind speed is obtained by using fluid software PHOENICS, and the tunnel section with different distance from the fire source is selected. The temperature-time curves of the domes of each section are established as the thermal loads simulated by the lining temperature field. (2) based on the theory of heat conduction, the thermal parameters varying with the temperature are adopted by using the large-scale finite element analysis software ANSYS. The temperature field of composite lining under different fire intensity and different tunnel section is simulated by reasonable selection of boundary conditions, and the distribution law of temperature field of tunnel secondary lining is studied. (3) the stratigraphic structure method is used to simulate the temperature field of composite lining under different fire intensity and different sections. On the basis of the temperature field of the lining structure mentioned above, the thermal stress of the lining structure under various working conditions is simulated and calculated. The distribution law of thermal stress and damage time and damage depth of tunnel secondary lining under the condition of no heat insulation are studied. (4) based on the previous experimental results, The methods to detect and evaluate the damage of tunnel lining structure after fire and to improve the fire resistance of tunnel lining structure are summarized.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451.4;U459.2
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