哈大客专路基冻胀变形特征及防治措施

Analysis on Frost Heaving Deformation Features of Passenger Dedicated Railway Subgrade and Its Prevention and Treatment Measures

以哈大客运专线的无砟轨道路基工程为依托,通过路基冻胀变形观测数据统计、现场勘察、试验等,从冻胀机理和控制因素角度对冻胀变形特征进行分析。总结了季节性冻土区无砟轨道路基设计和施工的经验。实践表明:路基基床表层的级配碎石层应添加水泥进行改良,深大路堑段应设置渗水盲沟,并适当加深冻结深度。

Based on the observation data statistics,field investigation and experiment on ballastless track subgrade engineering of Harbin-Dalian passenger dedicated railway,the frost heaving characteristics were analyzed from the points of frost heaving mechanism and controlling factors.The design and construction experience of ballastless track subgrade in seasonal permafrost region were summarized.The results showed that graded broken stone should be modified with cement in surface layer of subgrade bed,blind drainage system should be set in deep cutting sections,the value of frozen depth should be properly increased.The research results provide reference for frost heaving prevention and treatment in seasonal permafrost region.