LI Zhongyou,LIU Yuanxue,YAO Zhihua,et al.Stability Assessment and Mechanics Response of Tunnels Subjected to Fire Load[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(01):159-166.
LI Zhongyou,LIU Yuanxue,YAO Zhihua,et al.Stability Assessment and Mechanics Response of Tunnels Subjected to Fire Load[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(01):159-166. DOI: 10.13409/j.cnki.jdpme.2021.01.020.
Stability Assessment and Mechanics Response of Tunnels Subjected to Fire Load
Tunnel fire can lead to damage of lining structures, and endangers safety of tunnels. Based on microscopic physical and chemical changes of inner components at high temperature, the thermal decomposition process of hydrates and thermal damage process of aggregate at high temperature are studied, and the degradation mechanisms of concrete at high temperature are revealed, then a thermal damage model is proposed. The model not only can consider the influence of temperature as traditional models, but also can take into account the influence of temperature duration. Based on the model, the lining structure damage of a shield tunnel in soft soil is studied. The change law of mechanics response, deformation and stability of the tunnel under the load of temperature and force is provide, which can be used as a reference for fire safety design and assessment of concrete structures after fire.
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