哈大高速铁路路基冻胀自动观测和深化分析研究

哈大高速铁路通车后,路基冻胀变形控制是其一项重要任务,为查明路基冻胀机理,探索适用的冻胀处理措施,对路基冻胀进行自动观测和深化分析研究。采用自动观测系统,对路肩以下5 m范围内路基的地温、水分、冻胀变形等进行观测,对观测结果进行统计分析和深化研究,研究结果表明:路基冻胀可分为5个阶段,冻深介于100~300 cm,基本上随着纬度的增大而增大;基床表层冻胀量占总冻胀量的40%~94%;融沉变形稳定后,存在4mm以内的残余变形;路堤与路堑的冻胀发展过程极为接近,但路堤的冻深一般大于路堑,路堤的冻胀量一般略大于路堑。

Automatic Observation and Intensive Analysis of Frost Heaving of Harbin-Dalian High-speed Railway Subgrade

After Harbin-Dalian high-speed railway was opened to traffic,the control of subgrade frost-heaving deformation becomes one of the important tasks. Automatic observation and intensive analysis on frost heaving of the subgrade are conducted to ascertain the frost-heaving mechanism and explore applicable treatment measures. Automatic observation system is adopted to observe the temperature,moisture and frost-heaving deformation of subgrade within 5 meters under the shoulder. This article statistically analyzes and studies in detail the observation data. The results show that: subgrade frost heaving can be divided into five stages; frost-heaving deformation increases along with the rising of latitude at the freezing depth between 100 ~ 300 cm; frost heaving of surface layer accounts for 40% to 94% of the total amount; the residual deformation is less than 4mm after thawing settlement deformation becomes stable; development processes of frost-heaving in embankment and cutting are very similar,but the deformation and frozen depth in embankment is generally greater than that in cutting.