【作者】 周旭；

【导师】 赵明华； 袁永年；

【作者基本信息】 湖南大学 ， 建筑与土木工程， 2002， 硕士

【摘要】 随着我国西部建设的高速发展，大跨度特长公路隧道日益增多，隧道火灾损伤评估与防治研究已成为隧道工程急需解决的关键问题之一。本文首先通过深入分析国内外隧道火灾事故原因及其防灾设施设置标准，重点讨论了长大隧道的火灾防治设计方法，并结合上瑞国道主干线邵阳至怀化高速公路拟建的长达7． 6公里的雪峰山隧道工程特点，提出了该隧道的防灾设计标准；然后通过对大量隧道衬砌材料与构件火损试验数据的深入分析和研究，得出一系列具有工程指导意义的隧道衬砌受高温作用后其损伤程度(烧伤、酥松、剥落深度)、抗压强度、抗拉强度等随不同烧损温度和时间作用的变化规律；最后对各种温度量级下衬砌结构的烧损状况进行了深入分析，并结合试验和已有工程经验，提出了简单实用的隧道结构火灾损伤等级的划分标准及隧道结构的耐火极限温度。此外，本文通过引进可靠度理论中的复合并串联系统，建立出隧道灾后可靠度的评估模型，提出了公路隧道在发生火灾事故后衬砌结构承载能力的可靠度评估方法，在对有关试验测试资料进行概率分布统计的基础上，对不同火灾温度场作用后衬砌结构的失效概率及其剩余承载能力进行了评估，由此提出了评价隧道火灾后衬砌结构的可靠度指标，并用于雪峰山隧道工程实践。本文主要研究结果考虑了隧道衬砌不同火灾、温度和时间烧损的实际情况，具有较高的实用价值和可操作性，因此可为雪峰山隧道及其它同类工程的防灾设计提供科学的参考依据。更多还原

【Abstract】 With increased construction of long-span and extra-long highway tunnel, the research on damage evaluation and prevention & control of fire hazard in tunnel is becoming increasingly important. Through analysis of causes of fire in tunnels and of calamity prevention facility criterion in home and abroad, this paper made a discussion of fire prevention methods for long and large highway tunnels. And in conbination with the engineering characteristics of the planned 7.6-kilometer-long Xuefeng Mountain Highway Tunnel on Shaoyang to Huaihua Expressway, this paper proposed the design standard of calamity prevention for this tunnel. And then, through deep analysis and research of large quantities of tunnel lining materials and testing data of fire loss on members, it draws a series of change law of the damage degree of the tunnel lining under high temperature, such as burns, crisp, peeling, varied with different burning temperature and time, and that of the compression strength and the tensile strength varied with burning temperature and time. Finally, through deep analysis of damage condition of the tunnel lining under various temperature degree and combining the tests and existing engineering experience, it proposed a simple and practical criterion for categorizing the damage degree of the tunnel structure after the fire hazard, as well as the limit fire resistance temperature of the tunnel structure.Besides, this paper discusses the methods of reliability evaluation of bearing capacity of lining structure after the fire hazard occurred in highway tunnel by adopting compound parallel and series system in reliability theory, evaluates the ineffectiveness probability and its remaining bearing capacity of lining structure under different temperature field of fire hazard on the basis of the probability distribution statistics for the related experimental testing data, provides the reliability index of lining structure, and then gives the applied project examples in Xuefeng Mountain Tunnel.The main study results and conclusions draw from this paper takes into consideration of the real damage of tunnel lining under different fire hazard, various temperature and time. Therefore, it has relatively high and practical value to operate and can provide inference for calamity prevention design for Xuefeng Moutain Tunnel and the similar engineering projects alike.更多还原