摘要
研究目的:由于目前对干寒地区路基长期稳定性研究还不能完全满足工程实际的需要,为此本文对干寒地区已修建的各种低路堤路基结构的短期及中长期可靠性和冻土环境的稳定性作出预测,进而对运营期间的路基维护和可能发生病害的治理提供理论支撑。研究结论:(1)为保证路基的长期稳定性,需要主动采取措施保护冻土,热管就是其中一种较好的措施;(2)在对冻土进行保护的过程中,热管的降温作用明显,热管路基可以抵消气候变暖对路基造成的不良影响;(3)路基本身对冻土的保温作用也很显著,路基越高对冻土的保温效果越好,路基越低对冻土的保温效果越差;(4)当路基高度低于某个极限时,不但不能对冻土起到保温作用,反而会使路基下冻土温度升高;(5)该研究成果可为我国在干寒地区修建各种路基结构的设计提供参考依据。
Research purposes： Theory of problem study of the long - term stability of subgrade in cold region still can not fully meet the needs of practical engineering. The low embankment structure of short, medium and long term reliability and permafrost environment stability in cold area was predicted, and it provides the theoretical support for subgrade maintenance and possible disease management during the operation. 1 ） In order to ensure the long - term stability of the subgrade, it is necessary to take measures to protect the frozen soil. The heat pipe is a good measure. （2） In the process of protecting the frozen soil, the cooling effect of the heat pipe is obvious, and the heat pipe subgrade can counteract the adverse effect caused by the climate warming to the subgrade. （3） The heat preservation effect of the subgrade is also significant, the higher the subgrade the better the insulation effect of frozen soil, the lower the effect of the insulation of the frozen soil is worse. （4） When the subgrade height is lower than some limit, it can not only play the role in insulation of the frozen soil, but will make the temperature of frozen earth temperature rise. （ 5 ） The research results can provide references for the design and renewal of various subgrade structures in the cold regions of China.
出处
《铁道工程学报》
EI
北大核心
2015年第9期35-40,共6页
Journal of Railway Engineering Society
基金
长江学者和创新团队发展计划资助(IRT1139)
国家自然科学基金项目(51168030)
甘肃省自然科学基金项目(1007JZA122)
关键词
干寒地区
路基
长期稳定性
工程措施
保温效果
cold region
subgrade
long - term stability
engineering measures
insulation effect
