摘要
针对青藏铁路多年冻土地区的路基稳定问题,提出了施工前预冷路堤土的思路,并建立了用于试验路段的分析模型.分析表明:路基施工完成后的前3 a是温度场剧烈变化的阶段,也是路基容易出现破坏的时期;预冷路堤土对这段时间路基温度场的演变影响十分显著.采用-1℃预冷施工后,前3 a路基下多年冻土的上限迅速上移,与天然上限相比提高5～8 m;和普通方法相比,路基中融化夹层的消失时间提前10 a以上,有效地维护了路基的长期稳定.
For the problem of the stability of the Qinghai-Tibetan railway roadbed in permafrost region, a method of pre-cooling roadbed before construction was put forward, and an analysis model used for tested roadbed was set up. The results indicate that the variation of the temperature field of the tested roadbed is tempestuous in the first three years after construction to be finished, and the roadbed is destroyd easy in this period; the influence of pre-cooling roadbed on the variation of the temperature field of the roadbed is very remarkable. Using the method of -1℃ pre-cooling roadbed, the permafrost table below roadbed is moved up 5-8 m rapidly comparing with nature permafrost table in the first three years after constructing, and the vanishing time of melt belt is 10 years ahead of scheduled time comparing with the normal construction method. Therefore, this method can safeguard the stability of the roadbed effectively.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2004年第6期611-615,共5页
Journal of China University of Mining & Technology
基金
国家973项目(2002CB412704)国家自然科学基金项目(40471021)冻土工程国家重点实验室开放基金(SKLFSE200304)
关键词
青藏铁路
路基
预冷土
温度场
融化盘
Qinghai-Tibetan railway
melt belt
temperature field
pre-cooling roadbed
