Dissertation > Transportation > Road transport > Tunnel project > Tunnel structure theory > Theory of tunnel lining

A Study on Fire Damage to Subway Tunnel Lining and Evaluation Method after Fire Scenarios

Author QiangJian
Tutor ZhuHeHua
School Tongji University
Course Structural Engineering
Keywords Subway Shield Tunnel Lining Structure High temperature damage Assess
CLC U451.4
Type Master's thesis
Year 2007
Downloads 337
Quotes 7
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Perfection and intensity of the subway system solution the bulk traffic problems in major cities, however, due to the high traffic of metro traffic, in the event of a fire, it will cause a huge social impact and economic losses. Metro Shield Tunnel fire, high temperature causes the lining structure of thermal expansion, and significantly reduce the strength and modulus of the lining of the structural materials, structural deformation increases, capacity decline. After the fire, how quickly and accurately assess fire high temperature structural damage of the tunnel lining, the development of the tunnel structure repair reinforcement program to restore the tunnel to use the function to ensure the safety of the tunnel structure and other aspects of practical significance. In this paper, fire detection and evaluation method of tunnel lining structure of high-temperature damage and fire after lining structure. Specific studies include: shield tunnel lining concrete after high temperature fire Lining Tube physical deterioration of the mechanical properties of the law; cross-section of the lining structure calculation of the temperature field theory and the simplified calculation method; cross-section of the high-temperature bearing capacity of the lining structure theory and review ; subway tunnel after a fire detection and evaluation methods, criteria and evaluation procedures. This article by Experimental study of the specimen given shield tunnel lining C50 concrete residual compressive strength, peak strain, deformation modulus and the deterioration of the relationship between the highest experienced temperature and the dimensionless stress - strain relation mathematical models. 1/3 scale model segment by Metro Shield Tunnel Lining of high temperature fire tests, analysis of the internal temperature field of the segment when the high temperature changes in the law, found that the fire high temperatures will make the appearance of the segment characteristics change significantly, the stiffness of the segment deterioration, carrying performance. Reasonable assumptions and material thermo-physical parameter selection, and experimental results verify the model segment illustrates the application of Marc software to achieve the numerical calculation of the lining structure of transient heat conduction process feasibility. By a large number of calculations, the the fire cooling stage the lining-sectional temperature rise phenomenon subway shield tunnel lining structure temperature field assessment formula. The article also discusses the calculation of the the lining structure cross-section high temperature bearing capacity theory, proposed integration method, the slice method, the equivalent section method, the method of calculation of high temperature bearing capacity principle lining high temperature structural member section bearing capacity Checking of steps and formula. In addition, this article by summarizing the concrete structure of post-disaster detection and evaluation methods and the specimen high temperature testing, given suitable for field detection methods and specialized Criterion Metro Shield Tunnel disaster assessment and post-disaster assessment program model established Metro Shield Tunnel Lastly, a brief discussion about the direction of further work

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