高速铁路利用停建路堤改造加固措施研究

张家口至呼和浩特高速铁路在进入呼和浩特东站地区时,需利用集包第二双线路堤线位。通过开挖探槽对已填筑路堤进行填料性质和压实质量检测,现场开展冲击压实和低能量强夯处理试验,并与废弃重建方案进行技术经济比较,最终确定采用低能量强夯结合堆载预压处理停建路堤的方案,可最大限度地利用停建的已填筑路堤,节省工程投资。沉降观测评估表明,强夯结合路基面预压处理后沉降较小,可以满足时速250 km有砟轨道高速铁路路基工后沉降控制要求,张呼高铁开通后,路基整体质量良好,满足高速铁路行车要求。

Study on the Reconstruction and Strengthening Measures of the Railway Embankment that has Been Stopped for Passenger Dedicated Line

When the Zhangjiakou to Hohhot High-speed Railway from entered the East Hohhot station area,it needs to use the second double-line embankment position of Jibao Line.The filling properties and compaction quality of the filled embankment are tested by digging the exploratory trench,the field tests of impact compaction and low energy dynamic compaction are carried out,and the technical and economic comparison with the abandoned reconstruction scheme is carried out.In the end,the scheme of low energy dynamic compaction combined with surcharge preloading is adopted to treat the stopped filling embankment,which makes the best use of the stopped embankment,saves the project investment.The settlement observation and evaluation show that the settlement of dynamic compaction combined with surcharge preloading treatment on subgrade surface is small,which can meet the requirements of post construction settlement control of 250 km/h ballasted track high-speed railway subgrade.After the opening of Zhangjiakou to Hohhot High-speed Railway,the overall quality of subgrade is good,meeting the requirements of high-speed railway operation.