中文摘要：

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。

英文摘要：

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.