当前位置: X-MOL 学术Tunn. Undergr. Space Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Disaster mechanism of shield tunnel under sequential disasters of earthquake and post-earthquake fire
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-06 , DOI: 10.1016/j.tust.2024.106361
Guobo Wang, Jingchao Wu, Jianning Wang, Zhiguo Yan, Zhongxian Liu

Significant casualties and economic losses can result from a strong earthquake followed by a fire in a shield tunnel. This study employed a numerical thermal–mechanical coupling method, validated with test data, to examine the dynamic response and disaster mechanisms of shield tunnels subjected to seismic events and subsequent fires. The analysis focused on the effects of post-earthquake fires on the deformation and internal forces of a shield tunnel, considering seismic amplitudes, fire characteristics, and soil properties. The findings indicate that (1) the extent of initial damage caused by an earthquake is a critical determinant of the fire resistance of a shield tunnel. A post-earthquake fire exacerbates the stress and deformation of the structure. When compared to scenarios involving only a fire or an earthquake, the deformation of the structure increased by 241.6% and 85.6%, respectively, whereas the bending moment increased by 31.6% and 254.6%. (2) Temperature rise curves significantly affect the rate of temperature increase, deformation, and internal force in the tunnel structure during the initial stages. Despite similar maximum temperatures, the prolonged combustion and resultant degradation of structural mechanical properties considerably impair the integrity of the tunnel. (3) The constraining effect of the soil on the tunnel strengthens with an increase in the shear wave velocity, which can effectively mitigate the initial seismic damage to the structure. Consequently, the deformation of the structure decreases, and the axial force of the segment increases, which can prevent the opening of the segment. These results provide technical insights that can enhance the comprehensive disaster prevention capabilities of shield tunnel structures.

中文翻译:


地震和震后火灾连续灾害作用下盾构隧道的灾害机理



盾构隧道发生强烈地震后发生火灾,可能导致重大人员伤亡和经济损失。本研究采用数值热-机械耦合方法,并通过测试数据进行了验证,以检查盾构隧道在地震事件和后续火灾中的动态响应和灾害机制。分析的重点是地震后火灾对盾构隧道变形和内力的影响,同时考虑了地震幅度、火灾特性和土壤特性。研究结果表明:(1) 地震造成的初始破坏程度是盾构隧道耐火性的关键决定因素。地震后的火灾加剧了结构的应力和变形。与仅涉及火灾或地震的情况相比,结构变形分别增加了 241.6% 和 85.6%,而弯矩增加了 31.6% 和 254.6%。(2)温度上升曲线对隧道结构初期温度的上升速率、变形速率和内力有显著影响。尽管最高温度相似,但长时间燃烧和由此产生的结构机械性能退化严重损害了隧道的完整性。(3)土体对隧道的约束作用随着横波速度的增加而增强,可有效减轻结构的初始地震损伤。因此,结构的变形减小,段的轴向力增加,这可以防止段的打开。这些结果提供了技术见解,可以增强盾构隧道结构的综合防灾能力。
更新日期:2025-01-06
down
wechat
bug