季节冻土地区改扩建公路路基的设计方法分析

Analysis on Design Method of Highway Subgrade Rebuilding in Seasonal Frozen Soil Area

季节冻土地区公路路基往往会发生冻胀、融沉破坏。多年来,由于对季节冻土的重视程度不够,或忽略了季节冻土的特殊性,季节冻土公路路基在建成运营后往往出现不同程度的冻胀病害。在公路改扩建工程中,需要对既有道路进行检测评价,尤其是既有道路的冻胀病害,并通过改扩建工程措施进行一次性改善。结合国道332线拉布大林至哈达图段公路改扩建工程,对季节冻土特点及季节冻土区改扩建公路路基的设计方法进行了分析,得出其主要特点和技术要点。

In seasonal frozen soil area,the highway subgrade may be subject to frost heaving and thaw subsidence damage. Over the years,due to the emphasis on seasonal frozen soil is not enough,or the particularity of seasonal frozen soil is ignored,the seasonal frozen soil highway subgrade is often subject to different degrees of frost heaving after completion and being put into operation. In the highway reconstruction and extension project,existing roads shall be detected and evaluated,especially the frost heaving of existing roads and reconstruction and extension project measures shall be taken to improve diseases at one time.Combining the reconstruction and extension project of State Road 332 from Labudalin to Hadatu Segments,the design method of reconstruction and extension of highway subgrade in seasonal frozen soil is analyzed on characteristics of seasonal frozen soil and main characteristics and key technologies are obtained.