青藏铁路多年冻土区路基热防护工程效果分析

研究目的:我国青藏铁路的修建充分考虑了对多年冻土的保护,在路基热防护措施中采用了热棒路基,碎(片)石护坡、块石护坡、片石气冷等关键技术。文章对青藏铁路各种路基新结构的地温进行研究,通过地温值计算得出最大融化深度,从各年最大融化深度的对比分析,研究这些措施对保护多年冻土,保证线路安全的作用。研究结论:通过对实测数据的分析得出热防护措施能使路肩下最大融化深度减小。路基新结构的应用对保护多年冻土、降低地温、稳定路基是有效的。

Analysis of Engineering Effect of Heat Safeguard in Permafrost Regions along Qinghai - Tibet Railway

Research purposes: We matured the protecting of the permafrost in construction of the Qinghai-Tibet railway.We adopt some key technices at heat fense measure to roadbed,for example thermal probes,rubble revetment,and crushed rock embankment and so on.The paper researched the ground temperature of such roadbed new structure of Qinghai-Tibet Railway.Through calculating of the ground temperature we obtain corresponding the maximum thawed depth.Through comparative analysis of the maximum thawed depth,the paper researches the measure’s effect at protecting permafrost and the safety of the railway. Research conclusions:The paper based on the analysis of the data concludes that the heat fense measure can minish maximum thawed depth under shoulder.The applying of the roadbed new structure can protect permafrost,debase ground temperature and make the roadbed stabilization.