高地热区穿越断层隧道的隔热与地震效应研究
Study on thermal insulation and seismic effect for fault-crossing tunnel in high geothermal area.
作者信息
Cui Guangyao, Shi Wenhao
机构信息
School of Civil Engineering, North China University of Technology, No.5 Jinyuanzhuang Road, Beijing, 100144, China.
出版信息
Sci Rep. 2022 Jul 5;12(1):11383. doi: 10.1038/s41598-022-15626-4.
The fault-crossing tunnel in high geothermal areas can be severely damaged under strong earthquake. In this paper, numerical models were established in Flac to investigate the thermal insulation and seismic effects under the strong earthquake when using highly damped composite structure. The results showed that the thermal insulation effect of the PC, the PC highly damped composite structure and the SFRC highly damped composite structure were almost the same, which the PC highly damped composite structure was slightly better. After applying the highly damped composite structure, the maximum and minimum principal stresses on the lining decreased, it showed that highly damped composite structure could enhance the seismic effect of tunnel. The safety factor of SFRC highly damped composite structure was 2.420, which was a 28.14% increase compared to PC. Based on numerical simulations, the thermal insulation and seismic effect of SFRC highly damped composite structure was better than other seismic measures. The research can provide a reference for the design of thermal insulation and anti-earthquake for fault-crossing tunnel under strong earthquake in high geothermal area.
高地热地区的穿越断层隧道在强震作用下可能会受到严重破坏。本文在Flac中建立数值模型，研究采用高阻尼复合结构时在强震作用下的隔热和地震效应。结果表明，PC、PC高阻尼复合结构和SFRC高阻尼复合结构的隔热效果几乎相同，其中PC高阻尼复合结构稍好一些。施加高阻尼复合结构后，衬砌上的最大和最小主应力减小，表明高阻尼复合结构可以增强隧道的抗震效果。SFRC高阻尼复合结构的安全系数为2.420，与PC相比提高了28.14%。基于数值模拟，SFRC高阻尼复合结构的隔热和抗震效果优于其他抗震措施。该研究可为高地热地区强震下穿越断层隧道的隔热与抗震设计提供参考。
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