摘要
南京纬三路过江隧道处于高水压、软弱地层等情况下,火灾可能导致隧道衬砌及密封防水失效,使得隧道发生渗漏、涌水,对隧道造成毁灭性的灾害。采用有限元数值方法,对施工条件下、正常运营条件下无防护措施和有防护措施3种情况的衬砌管片进行火灾数值模拟。分析结果表明:施工状态下,止水带附近的温度在60℃以下,止水带处于安全状态;运营条件下,当无防火措施发生2 h火灾时,内侧止水带附近的最高温度接近300℃,止水带会被烧焦破坏;当有30 mm防火板保护发生2 h火灾时,止水带的最高温度保持在100℃之内,止水带安全。计算结果还表明,20 mm厚的防火板材在1 h的较大火灾的情况下能够保证结构的安全和止水带的安全,而30 mm厚的防火板能够在2 h的较大火情下保证结构的安全和止水带的安全。
The Weisan Road Yangtze River tunnel of Nanjing is under high water pressure and passes through weak stratum.Fire may cause the failure of lining and the waterproof,resulting in tunnel leakage and water gushing,and it may cause destructive disasters of the tunnel.Based on the FEM analysis,segments under fire and different conditions are simulated,including construction stage,normal operation condition without protective measures and normal operation conditions with protective measures.The analysis shows that,at construction stage,the temperature near the waterproof is below 60 ℃,and the waterproof is in a safe state.Under operating conditions without fire prevention measures,after fire of 2 h,the maximum temperature near the internal waterproof is close to 300 ℃,and the waterproof will be burned.Under the protection of 30 mm-fireproof board,after fire of 2 h,the maximum temperature of the waterproof can be controlled below 100 ℃,ensuring the safety of the waterproof.The 20 mm-fireproof board can ensure the structural safety and the waterproof safety for 1 h under larger fire case,and 30 mm-fireproof board can ensure the safety for 2 h.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2013年第S1期269-274,共6页
Chinese Journal of Geotechnical Engineering
关键词
防火特性
盾构隧道
衬砌
止水带
fireproof characteristic
shield tunnel
lining
waterproof
