铁路隧道整体式衬砌火灾力学响应特性数值模拟

发布时间：2018-01-21 07:51

本文关键词： 衬砌结构火灾数值模拟力学特性　出处：《火灾科学》2015年01期 　论文类型：期刊论文

【摘要】：通过ANSYS有限元数值模拟软件,建立了铁路隧道整体式衬砌的二维热力耦合有限元计算模型,基于ISO834标准火灾温升曲线,对不同单双线和不同等级围岩的铁路隧道整体式衬砌(单线III级围岩衬砌、双线III级围岩衬砌、单线IV级围岩衬砌、双线IV围岩衬砌)的火灾力学响应行为进行了数值模拟研究,获得了火灾作用下,不同的铁路隧道整体式衬砌拱顶竖向位移、边墙侧向位移、压应力、剪切应力的变化情况。结果表明:双线整体式衬砌拱顶的竖向位移大于单线整体式衬砌,围岩等级越大整体式衬砌拱顶的竖向位移越大,整体式衬砌承受的最大压应力和最大剪切应力随时间集中在不同厚度层的混凝土区域上。所获得的结论可为铁路隧道整体式衬砌的防火设计和安全性研究提供理论参考。
[Abstract]:A two-dimensional thermo-mechanical coupled finite element model of railway tunnel lining is established by using ANSYS finite element simulation software. Based on the ISO834 standard fire temperature rise curve. The integral lining (single line III class wall rock lining, double line III class surrounding rock lining, single line IV class wall rock lining) of railway tunnel with different single and double lines and different grade surrounding rocks is studied. The numerical simulation of fire mechanical response behavior of double-track IV surrounding rock lining) is carried out, and the vertical displacement, lateral displacement and compressive stress of different railway tunnels with integral lining arch roof are obtained under the action of fire. The results show that the vertical displacement of double line integral lining arch roof is greater than that of single line integral lining, and the larger the surrounding rock grade is, the greater the vertical displacement of integral lining arch roof is. The maximum compressive stress and the maximum shear stress of the integral lining are concentrated in the concrete area with different thickness over time. The conclusions obtained can provide the theory for the fire prevention design and safety research of the integral lining of railway tunnel. On reference.
【作者单位】：中南大学防灾科学与安全技术研究所;建筑消防工程技术公安部重点实验室;
【基金】：湖南省自然科学基金重点项目(12JJ2033) 中央高校基本科研业务费专项资金资助建筑消防工程技术公安部重点实验室开放课题资助(KFKT2014ZD02)
【分类号】：U451.4
【正文快照】： 0引言隧道一旦发生火灾,往往会造成大量的人员伤亡和财产损失,同时,会降低衬砌的承载力和隧道的稳定性[1,2]。Choi[3]通过建立一种可以考虑在高温作用下混凝土的剥落和脱水等因素的有限元计算分析模型,研究了高温作用下隧道衬砌混凝土的剥落深度,内部温度场以及等效应力的变化

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