高纬度多年冻土特征与铁路地质选线

THE CHARACTERISTICS OF RAILWAY IN HIGH LATITUDE PERMAFROST AND THE CHOOSE SELECTION FOR RAILWAY

高纬度多年冻土位于我国东北大小兴安岭地区,是一种特殊性质的地基土,其工程特性与一般地区及青藏高原高海拔冻土不同。本文从嫩林铁路工程实际出发,介绍了该区域的地质地貌,分析了高纬度多年冻土区不良地质——冰丘、冰锥、地下冰、冻土沼泽的赋存环境,对铁路工程的危害及防治措施;阐述了高纬度多年冻土勘察和选线的新技术、新方法。所得结论对今后高纬度多年冻土区铁路建设具有重要的参考价值及指导意义。

High latitude permafrost lies in Daxinganling and Xiaoxinganling of northeast China belongs to a special soil.Its engineering properties have some differences with high altitude permafrost in Qingzang high- land.Out of the practice of Nenjiang-Xilinji railway,this paper analysed the unfavorable geological condition lies in high latitude permafrost-ice blister,ablation cone,ground ice,frozen swamp-including living envi- ronment,the hazard to railway engineering and prophylactic-therapeutic measures which used some new tech- nology and method.The conclusion was instructive and might be a reference to railroading in high latitude permafrost.