隧道火灾衬砌结构热力受损规律研究
发布时间：2018-07-14 11:40
【摘要】：在地下空间结构大规模开发的背景下，随着行车速度和行车密度日益加大以及隧道里程的不断增加，各类隧道事故发生的数量和频率也相应增加。其中，火灾发生频率高居各灾害之首，除烟雾使人窒息以外，高温下结构损坏甚至倒塌是造成人员伤亡的原因之一，更是造成直接和间接经济损失的主要原因，因此研究隧道衬砌结构火灾下温度场分布特点及受损特性对深入认识衬砌结构的火灾反应和抗火性能具有重大意义。并为隧道结构的健康监测提供指导。 本文的研究主体为高温火灾作用下的隧道衬砌结构，采用数值模拟作为主要的研究手段，，着重从隧道衬砌结构形状、衬砌混凝土强度等级、不同受火场景等方面对其力学特性和稳定性进行分析研究，具体研究内容包括以下几方面： （1）分析研究隧道衬砌结构在高温火灾作用下的一般力学特性和受损规律，得出受火时间长短和受火范围大小直接影响衬砌结构温度场的分布，并拟合出破损规律曲线； （2）考虑隧道断面形状、混凝土强度等级及隧道受火时间对高温火灾下隧道温度场和应力场的影响规律，得到受火时间为影响衬砌温度和位移的主要因素，隧道断面形状和混凝土强度等级为次要因素； （3）模拟分析衬砌结构在防火保护层作用下的温度分布及动态破坏特性，并提出有效的隧道衬砌结构火灾时的预防保护措施，最终得到防火保护层导热系数越低，其隔热隔温效果越好； （4）用有限元软件模拟分析工程实例，并与实例结果相对比，得到有限元软件火灾模拟可行性及可靠性。
[Abstract]:Under the background of large-scale development of underground space structure, with the increasing of driving speed and driving density and the increasing of tunnel mileage, the number and frequency of various tunnel accidents also increase correspondingly. In addition to smog suffocating, structural damage or even collapse at high temperature is one of the causes of casualties, and it is also the main cause of direct and indirect economic losses. Therefore, it is of great significance to study the characteristics of temperature field distribution and damage characteristics of tunnel lining structure under fire in order to deeply understand the fire response and fire resistance of lining structure. It also provides guidance for health monitoring of tunnel structure. The main body of this paper is tunnel lining structure under the action of high temperature fire. Numerical simulation is used as the main research means, especially from the shape of tunnel lining structure and the strength grade of lining concrete. The mechanical properties and stability of tunnel lining structures under high temperature fire are analyzed and studied in different fire scenarios, including the following aspects: (1) the general mechanical properties and damage rules of tunnel lining structures under the action of high temperature fire are analyzed and studied. The distribution of temperature field of lining structure is directly affected by the duration of fire and the range of fire, and the curve of damage law is fitted out. (2) considering the shape of tunnel section, The influence law of concrete strength grade and tunnel fire time on tunnel temperature field and stress field under high temperature fire, it is concluded that fire time is the main factor affecting lining temperature and displacement, tunnel section shape and concrete strength grade are secondary factors. (3) the temperature distribution and dynamic failure characteristics of lining structure under the action of fire protection layer are simulated and analyzed, and the effective protection measures are put forward. Finally, the lower the thermal conductivity of fire protection layer is obtained. The better the effect of heat insulation and temperature insulation is; (4) the feasibility and reliability of fire simulation of finite element software are obtained by using finite element software to simulate and analyze engineering examples.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451.4
本文编号：2121533
[Abstract]:Under the background of large-scale development of underground space structure, with the increasing of driving speed and driving density and the increasing of tunnel mileage, the number and frequency of various tunnel accidents also increase correspondingly. In addition to smog suffocating, structural damage or even collapse at high temperature is one of the causes of casualties, and it is also the main cause of direct and indirect economic losses. Therefore, it is of great significance to study the characteristics of temperature field distribution and damage characteristics of tunnel lining structure under fire in order to deeply understand the fire response and fire resistance of lining structure. It also provides guidance for health monitoring of tunnel structure. The main body of this paper is tunnel lining structure under the action of high temperature fire. Numerical simulation is used as the main research means, especially from the shape of tunnel lining structure and the strength grade of lining concrete. The mechanical properties and stability of tunnel lining structures under high temperature fire are analyzed and studied in different fire scenarios, including the following aspects: (1) the general mechanical properties and damage rules of tunnel lining structures under the action of high temperature fire are analyzed and studied. The distribution of temperature field of lining structure is directly affected by the duration of fire and the range of fire, and the curve of damage law is fitted out. (2) considering the shape of tunnel section, The influence law of concrete strength grade and tunnel fire time on tunnel temperature field and stress field under high temperature fire, it is concluded that fire time is the main factor affecting lining temperature and displacement, tunnel section shape and concrete strength grade are secondary factors. (3) the temperature distribution and dynamic failure characteristics of lining structure under the action of fire protection layer are simulated and analyzed, and the effective protection measures are put forward. Finally, the lower the thermal conductivity of fire protection layer is obtained. The better the effect of heat insulation and temperature insulation is; (4) the feasibility and reliability of fire simulation of finite element software are obtained by using finite element software to simulate and analyze engineering examples.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451.4
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