火灾下盾构隧道衬砌管片结构变形理论分析

Theoretical Analysis of the Deformation of Shied Tunnel Segment under Fire Situation

火灾高温会使盾构隧道管片衬砌的力学性能产生劣化,其受力变形也较常态下更为复杂。考虑到火灾下衬砌截面温度场的真实分布情况以及管片材料高温下力学性能的非线性,建立了高温下圆形衬砌变形的理论计算模型;针对盾构隧道管片衬砌,基于自由变形理论,得到了其高温下变形的解析解;根据具体算例得到了发生火灾时管片变形规律,为管片火灾下的防火设计提供了理论依据,并将计算结果与设计规范相对比,对灾后隧道内人员财产救援进行的时机给出了建议。

High temperature of tunnel fire brings great damage to lining segment of a shield tunnel,for the mechanical property of segments wakes a lot under fire situation. It could influence the deformation and force of the segment. The complex mechanical property of lining material under high temperature makes deformation and force analysis more intricacy. Via the theoretical analysis,a calculate model of deformation for the segment was built considering high temperature. Considering the temperature distribution on the segment＇s section and nonlinear of the mechanical property of segment during fire,this paper built up a theoretical calculation model to calculate the deformation of a segment during fire. Based on the free deformation theory of lining,this paper brings people the analytical solution of the segment＇s deformation on fire situation. Besides,the paper analyzed a specific example of the real situation,according to the calculate results,it brings out the deformation regulation of the segment. This could bring theoretical conferences to the design of a fire resistant segment. At last,compared with the slandered,chance of time for rescue was recommended.