青藏高原东部香日德—花石峡公路工程多年冻土分布特征分析

Analysis of Distribution Characteristics of Permafrost along Xiangride-Huashixia Highway in East Qinghai-Tibet Plateau

研究目的：拟建香日德—花石峡公路位于青海省境内,全长156.61 km,起点在香日德与G109线连接,终点至花石峡与G214线国道连接。其中K 88＋200~K 156＋610段长68.41 km,大部分海拔4 000 m以上,最高在挝卓依垭口,海拔4 445.647 m;本段线路位于青藏高原东部,多年冻土发育的边缘地带,本文通过勘察资料分析,得出沿线多年冻土分布特征并分析其变化规律。研究结论：通过对本段线路的勘察资料分析表明：本段多年冻土和海拔高度有很好的相关性,主要分布在挝卓依垭山垭口前后海拔4 200 m以上路段,局部海拔在4 000~4 200 m湖相沉积细粒土地段存在残余多年冻土。沿线整段多年冻土处于退化状态,且北坡较南坡年平均低温低,南坡多年冻土退化严重。

Research purposes： The planed Xiangride-Huashixia Highway is located in Qinghai Province,with total length of 156.61 km,Starting in Xiangride to connect the G109 National Highway,and ending in Huashixia to connect G214 National Highway.The sea level elevation of the most parts of the section between K 88 ＋200 and K 156 ＋610 with total length of 68.41 km is above 4 000 m and the highest sea level elevation is 4 445.647 m in the Zhuowoyi gap.This Highway is located in the east Qinghai-Tibet Plateau and the development edge of of the permafrost area.This paper analyzes the distribution characteristics and the change law of permafrost along the highway based on the analysis of the surveyed data.Research conclusions：The analysis of the surveyed data shows the permafrost in this area so closely correlates with sea level elevation that the permafrost is mainly located in the front and rear areas of Zhouwoyi gap with the sea level elevation of above 4 200 m.There are some residual permafrost in the area of lacustrine soil with sea level elevation of 4 000~4 200 m.The permafrost along the highway is in degenerate status and the permafrost on the south slope is degenerated seriously and the temperature of north slope is lower than south slope.