哈齐客运专线路基防冻胀施工关键技术探讨

以哈齐客运专线为工程背景,针对冻土地区路基的特定填料,合理优化选取了天然砂砾类料做为路基填料;通过试验段施工,结合天然细圆砾土A、B组填料最佳含水量、最佳颗粒级配、细颗粒含量,确定了合理的施工工艺及各项技术参数;根据设计要求提出一系列防冻胀措施,并对能够保证路基压实度、K30、E vd等各项检测指标符合设计及规范要求的技术方法进行了分析,满足了施工需要,成功解决了表层压实的难题;通过冻胀变形观测验证了防冻胀措施的效果,形成了稳定成熟的冻胀地区路基施工工艺、方法。

Key Technology of Frost Heaving Prevention for Subgrade Construction of Harbin-Tsitsihar Passenger Dedicated Line

Based on the Harbin-Tsitsihar Passenger Dedicated Line, in respect to the specific packing embankment in per- mafrost areas, the natural sand and gravel is selected as the subgrade embankment. Through indoor test and section con- struction, combined with the best grading, optimum content of fine grained soil natural smooth round gravel soil A and B group, the reasonable construction technology and technical parameters are determined. And according to the requirement of design the frost heaving measures are put forward, in addition, the detection method which can ensure the compactness of subgrade and meet the specification requirements are analyzed, eventually forms a stable and mature permafrost roadbed construction technology and method.