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为考察隧道衬砌在火灾高温下的变形性能,利用ABAQUS有限元软件建立了HC基准升温曲线下衬砌环的三维分析模型。分析了隧道衬砌结构在火灾高温下的温度场分布规律,以及钢筋混凝土衬砌结构变形情况。研究了地面超载、土体侧压力系数、火灾持续时间、峰值温度及升温速率对变形的影响。结果表明:地面超载较小时,衬砌拱顶随温度升高而接近围岩,反之则远离围岩;拱腰位移随地面超载的增大而不断增大;土体侧压力系数越大,拱顶越向外移动,而拱腰则越向内移动;火灾持续时间越长、峰值温度越高,拱顶越远离围岩,拱腰越靠近围岩;升温速率对衬砌升温初期的变形影响较大,后期影响不显著。
In order to investigate the deformation performance of tunnel lining under high temperature in fire, a three-dimensional analytical model of lining ring under HC reference temperature rise curve was established by ABAQUS finite element software. The distribution law of temperature field of tunnel lining structure under high temperature of fire and the deformation of reinforced concrete lining structure are analyzed. The effects of surface overloading, soil lateral pressure coefficient, duration of fire, peak temperature and heating rate on deformation were investigated. The results show that when the ground overloading is small, the lining arch of the lining approaches the surrounding rock with the increase of temperature, otherwise it is far away from the surrounding rock. The displacement of the arch waist increases with the increase of the ground overloading. The bigger the lateral pressure coefficient, The more the fire duration, the higher the peak temperature, the vault away from the surrounding rock, the arch waist closer to the surrounding rock; heating rate of lining early deformation of large impact, Late impact is not significant.