基于ABAQUS的长大隧道防火结构牺牲层体系热力耦合分析

Thermal Mechanical Coupling Analysis on Structural Sacrificial Layer System of Long Tunnel Fire Protection Based on ABAQUS

为进一步完善城市长大隧道结构的全生命期防火保护技术,文章以滕州市墨子湖隧道工程为背景,采用有限元软件对长大隧道防火结构牺牲层进行数值模拟。通过对火灾高温下隧道结构的应力、竖向位移、横向位移进行分析,研究高温下长大隧道防火结构牺牲层体系热力耦合性能。研究结果表明,用混凝土牺牲层加固后,一方面牺牲层混凝土能一定程度地阻碍热量向主体结构传导,另一方面牺牲层混凝土作为承载体与主体结构共同受力,提高了高温下主体结构的安全性,从而为城市长大隧道的建设提供了防火措施示范技术。

Taking the Mozi Lake tunnel project in Tengzhou as the background, the structural sacrificial layer system of long tunnel fire protection was simulated by finite element software. Through the analysis of the stress and the vertical displacement, lateral displacement of tunnel structure under fire, thermal mechanical coupling performance of tunnel fire sacrifice layer system structure of high temperature were researched, to further improve the fire protection technology of urban tunnel structure through the total life, and to solve the pivotal technical problems of long road tunnel construction and safety operation. The conclusion shows that after concrete sacrificial layer reinforced, the sacrificial layer of concrete can hinder to some extent to the main structure of heat conduction, as the carrier and main structure of the joint force of concrete at the expense of the other hand, not only making the force in a better state of the main structure, but also reducing the relative deformation of the main structure, to improve the safety of the main structure under high temperature, which can provides fire protection measures for urban long tunnel construction.