摘要
为研究青藏公路多年冻土人为上限在退化过程中对路基变形产生的影响过程和程度 ,在唐古拉山以南选择了 3处具有代表性的路面进行了为期 2a的路面变形观测 .资料表明 ,在多年冻土人为上限退化过程中随着公路路基结构、冻土类型的不同 ,路基变形从冻胀和融沉过程、冻胀量和融沉量、发生的时间都有很大的不同 .在高含冰量多年冻土区采用半挖半填结构产生的路基变形最为剧烈 ,在含冰量相对少且采用较高路堤结构的地段路基变形过程相对平缓 .同时结合探地雷达的勘察结果对路基下的融化区、多年冻土区的内部结构进行了分析 .结果显示 ,多年冻土人为上限的下移、地下冰的融化会在多年冻土人为上限以上的地质体中导致较强烈的层间错动和扰动 .
In order to understand the impact of artificial permafrost table to the subgrade deformation of the Qinghai-Tibetan Highway in degenerating process, three experimental observation fields were set up to measure the deformation of the road being built in south of the Tanggula Range. Measurement of two years shows that, when the artificial permafrost table descending, the deformation of the subgrade, such as frost heaving, thaw settlement, is quite different in some aspects, depending on subgrade structure and permafrost type. In the frozen zone with high ice content, if the road is half\|dug and half\|filled, the subgrade deformation is the strongest. In the zone with less ice, if the road is a high embankment, the subgrade deformation process is comparative slow and low\|grade. The freezing time and thawing time under roadbed is reverse with natural conditions.
出处
《冰川冻土》
CSCD
北大核心
2002年第5期623-627,共5页
Journal of Glaciology and Geocryology
基金
中国科学院寒区旱区环境与工程研究所知识创新工程项目 (CACX2 10 0 73 )资助
