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寒区隧道不同类型冻土段隔热(保温)层铺设厚度计算方法

, PP. 131-139

Keywords: 隧道工程,寒区隧道,数值模拟,隔热(保温)层厚度,季节活动层,多年冻土,非冻土

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Abstract:

?为了给寒区隧道工程中隔热(保温)层的设计提供参考,采用理论分析、温度场数值模拟计算等手段,对不同类型冻土段隔热(保温)层厚度的初步计算方法进行研究。结果表明:洞口浅埋季节活动层段的保温层无法阻止围岩的冻融循环,在进行保温层设计计算时可不予考虑;多年冻土段隔热层厚度的计算应综合考虑围岩的初始地温、施工期间二衬混凝土水化热以及施工期间的洞内气温等因素,以保证计算结果的合理性;洞口年平均气温大于0℃和小于0℃两种情况下,非冻土段保温层厚度的计算方法也不同,应根据工程实际情况选择相应的计算方法。

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