土工合成材料在多年冻土地区路基病害处治中的应用技术研究

Application of Geosynthetics for Treatment of Subgrade Troubles in Permafrost Regions

纵向裂缝与不均匀变形是多年冻土地区路基病害的主要类型 ,成因复杂 ,久治不愈 .综合国内外现有成果 ,对于路基不均匀变形 ,根据其成因 ,分别提出了土工合成材料处治不均匀变形技术与土工合成材料处治路基阳坡变形技术等处治措施 .对于路基纵向裂缝 ,根据其不同分类与不同严重程度 ,分别提出了土工合成材料处治纵向裂缝技术、柔性枕梁处治技术、边坡分层加筋处治技术等处治措施 ;根据多年冻土地区路基特点与环境条件 ,从土工合成材料的强度特性、构造特性、耐久性及抗施工损伤性能等方面 ,提出了土工合成材料选择时的原则 .结合青藏公路纵向裂缝处治工程 ,研究了土工合成材料处治病害施工技术 。

Longitudinal cracks and the non-uniform settlements due to complicated causes are two main subgrade troubles in permafrost regions, which are difficult to treat. In this paper, three treatments are presented for the non-uniform settlements, according to their formation. Again, three treatments are presented for the longitudinal cracks, according to their types and classes. Analyzing the strength property, structural property, longevity and nature of easy to damage in construction, principles of choosing geosynthetics are presented. Combined with the knowledge in experiment project, construction technology is presented for permafrost regions. At the same time, the key construction technological problem of geosynthetics used in theses regions is also solved in this paper .