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冰川冻土 ›› 2017, Vol. 39 ›› Issue (2): 366-374.doi: 10.7522/j.issn.1000-0240.2017.0042

• 寒区科学与技术 • 上一篇    下一篇

季节性寒区隧道温度场数值分析

杜耀辉1,2, 杨晓华1, 晏长根1   

  1. 1. 长安大学 公路学院, 陕西 西安 710064;
    2. 甘肃长达路业有限责任公司, 甘肃 兰州 730000
  • 收稿日期:2016-12-11 修回日期:2017-02-16 出版日期:2017-04-25 发布日期:2017-07-08
  • 作者简介:杜耀辉(1981-),男,甘肃榆中人,高级工程师,2008年在长安大学获硕士学位,现为长安大学在读博士研究生,从事岩土工程方面的研究及高速公路建设管理工作.E-mail:360489245@qq.com
  • 基金资助:
    国家自然科学基金(41272285)资助

Numerical analysis of tunnel temperature field in seasonal frozen regions

DU Yaohui1,2, YANG Xiaohua1, YAN Changgen1   

  1. 1. School of Highway, Chang'an University, Xi'an 710064, China;
    2. Gansu Changda Highway Company Limited, Lanzhou 730000, China
  • Received:2016-12-11 Revised:2017-02-16 Online:2017-04-25 Published:2017-07-08

摘要: 为解决寒区隧道冻害问题,以祁连山某隧道为依托,采用ANSYS对铺设保温层与主动辅热相结合的隧道温度场进行了数值模拟,研究了保温层对隧道衬砌的保温效果以及安装电伴热系统后隧道的温度场分布规律,确定了电伴热系统的开启与关闭时间及正常运行功率。结果表明:围岩最大冻深月份比外界大气的最冷时间推迟一个月左右;在隧道大约运行5 a之后,保温层的保温效果开始衰退,围岩重新出现负温状态;安装电伴热系统能彻底解决寒区隧道运营期间的冻害问题,最佳发热功率为125 W·m-2,持续加热时间为80 d,年消耗电能为10 000 W·d·m-2,数值模拟结果与理论计算结果吻合良好。研究成果可为寒区隧道的保温防冻提供理论依据,并可为类似工程提供借鉴。

关键词: 季节性寒区隧道, 保温防冻, 数值模拟, 主动辅热, 温度场

Abstract: To completely solve the problem of freeze injury to tunnels in cold regions, taking a tunnel in the Qilian Mountains as a case, the freeze-proofing measures with insulation layer and active auxiliary-heat were numerical simulated by using ANSYS. It is revealed that the maximum frozen time of surrounding rock will be delayed by one month as compared with the outside minimum air temperature. After about 5-year operation, the effect of insulation layer will begin to decline, and the surrounding rock temperature will begin to negative again. Installing an electric heat tracing system can completely solve the problem of freeze injury to tunnel in this case, with a heating time of 80 days and a heating power of 125 W·m-2. The annual consumption of electrical energy is 10 000 W·d·m-2. The numerical simulation results are in good agreement with the theoretical calculation. This research results can provide theoretical basis for insulation and freeze-proofing of tunnels and is useful for similar engineering in cold regions.

Key words: tunnel in seasonal frozen regions, insulation and freeze-proofing, numerical simulation, active auxiliary-heat, temperature field

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