大西高速铁路路基冻胀分析及整治措施

Analysis of Subgrade Frost Heaving for Datong-Xi'an High Speed Railway and Its Treatment Measures

大同—西安高速铁路综合试验段部分路基冻胀变形特征明显,变形大,段落长。部分路段冻胀量最大达18 mm,冻结深度最大达88 cm。以大西高速铁路综合试验段为研究背景,针对纬度较低的季节性冻土地区路基冻胀问题,分析了冻胀成因,探究了冻胀的发展趋势,并提出了轨道封闭-基床表层排水-基床底层排水的综合整治方案。深入探讨了关键工艺,提出了高路堑段基床底层盲沟渗水和明洞过渡段隔离开槽顺接侧沟排水的整治措施,解决了低纬度季节性冻土地区高速铁路路基结构的冻胀问题。

In the section of Datong-Xi＇an high speed railway comprehensive test,the subgrade frost heaving deformation was obvious and its range was large.The maximum of height of frost was 18 mm and depth of frost was88 cm.Taking the comprehensive test section of Daxi high speed railway as an example,in order to solve the frost heaving problem of subgrade in seasonal frozen ground region with low latitudes,the causes of frost heaving were analyzed in this paper.The comprehensive treatment scheme was put forward,which was track closed-the bed surface drainage-the bed bottom drainage.The treatment measures were put forward by further discussion /which were water seepage in blind ditch from bed bottom in high cut section.The measures solved the problem of frost heaving of high speed railway subgrade in seasonal frozen ground region with low latitudes.