深季节冻土地区铁路路基施工变形监控研究

Study on Observation and Control of the Railway Subgrade Deformation in Deep Seasonal Frost Region

针对深季节冻土区冻胀融沉对路基施工的影响，选取哈齐客运专线中典型断面进行现场施工监测，对变形规律进行了分析。结果表明：路基变形表现出明显的不均匀性，最大变形位置在其靠近阳面一侧而不是路基中心；路基面冻胀量很小，最大为1．63 mm，表明路基抗冻胀填料效果很好；预测最大工后沉降4．2 mm，满足我国无砟轨道高速铁路的设计要求。

In order to control the heaving and thaw effect of subgrade in deep seasonal frost region,an observation had been carried out on the typical section in Harbin-Qiqihar Passenger Dedicated Line.The trend of the deformation development is analyzed.The results showed that,a significant inhomogeneity of subgrade deformation was given,maximum deformation po-sition appeared near the sunny side rather than the center of subgrade.The amount of frost heaving was quite small,only to a maximum of 1.63 mm,indicating that the anti-frost roadbed filler worked well.The maximum post-construction settlement was forecasted to 4.2 mm,which could meet the design requirements of the ballastless track high-speed railway.