School of Emergency Management and Safety Engineering, China University of Mining & Technology, Beijing, Beijing 100083, China; Beijing Key Laboratory of Metro Fire and Passenger Transportation Safety, China Academy of Safety Science and Technology, Beijing 100012, China.
School of Emergency Management and Safety Engineering, China University of Mining & Technology, Beijing, Beijing 100083, China.
Accid Anal Prev. 2022 Apr;168:106620. doi: 10.1016/j.aap.2022.106620. Epub 2022 Feb 24.
The temperature of surrounding rock of the underground railway tunnel is increasing year by year. This slowly changing thermal hazard not only has a prominent impact on the stability of tunnel surrounding structures, but also deteriorates the tunnel thermal environment, so the formation of the thermal hazard should be investigated. In this work, the thermal hazard model of tunnel surrounding rock was established under the superposition of ground atmospheric temperature wave and tunnel wind flow temperature wave. The corresponding simulation software was developed to estimate the thermal hazards. This dual periodic temperature boundary model (DPTB) was also investigated in comparison with the single periodic temperature boundary (SPTB) model that simplified the periodic ground atmospheric temperature to a constant. The results show that the overlying rock layer of the tunnel is more affected by the superposition of double periodic temperature waves, and its temperature will be significantly higher in autumn. For the calculation example, the average annual heat storage in the surrounding rock under the DPTB is 41,775 kJ/m, reduced by 432 kJ/m compared to the SPTB. The average temperature rise in the shallow surface surrounding rock over 25 years under the DPTB is about 2.04 °C, which is 0.48 °C lower than that of the SPTB. These calculation results provide a reference for the thermal hazards control in underground railway tunnels.
地铁隧道周围岩土体温度逐年升高。这种缓慢变化的热危害不仅对隧道围岩结构的稳定性有显著影响，而且会恶化隧道热环境，因此应对热危害的形成进行研究。本工作建立了在地表大气温度波和隧道风流温度波叠加作用下的隧道围岩热危害模型，并开发了相应的模拟软件来估算热危害。还将该双重周期温度边界模型（DPTB）与简化周期性地表大气温度为常数的单一周期温度边界模型（SPTB）进行了对比。结果表明，隧道上方覆盖层受双重周期温度波叠加的影响更大，秋季温度会显著升高。对于计算实例，DPTB 下围岩的年平均蓄热量为 41775 kJ/m，比 SPTB 减少了 432 kJ/m。DPTB 下 25 年内浅表层围岩的平均温升约为 2.04°C，比 SPTB 低 0.48°C。这些计算结果为地铁隧道的热危害控制提供了参考。
