青藏铁路沿线多年冻土区地温场变化规律  

Variation of the Ground Temperature Field in Permafrost Regions along the Qinghai-Tibetan Railway

作　　者：潘卫东[1] 余绍水[2] 贾海锋 刘登科[2] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000 [3]中铁西北科学研究院,甘肃兰州730000

出　　处：《冰川冻土》2002年第6期774-779,共6页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目 ( 40 1710 2 1);中国科学院知识创新工程重大项目 (KZCX1 SW 0 4 )资助

摘　　要：青藏铁路通过约 550km的多年冻土区 ,统计和分析青藏高原多年冻土分布区主要气象台站的资料可以看出 ,近 30a来高原多年冻土区的气候变化总的趋势是向着气温升高的方向发展的 ,气温的变化对多年冻土热状态的扰动主要表现在地温场的变化上 .30多年来高原气温升高 0 .45℃左右 ,并引起冻土地温平均升高了 0 .2～ 0 .3℃ .分析青藏铁路通过的多年冻土地区典型地段测温孔资料 ,发现多年来气候转暖已经使冻土上部 (2 0m以上 )地温明显升高 ,影响深度已经波及到了 40m .Over 550 km roadbed of the Qinghai-Tibetan Railway is constructed in permafrost Regions. Analyzing the data of main observatories on permafrost regions in the Tibetan Plateau, it is found that the main climate change trend in permafrost regions is increasing in the last 30 years. The change of ground temperature field embodies that climate change influences thermal state of frozen soil. For the 30 years, air temperature in the plateau has increased about 0.45 ℃, causing the temperature of frozen soil averagely increasing about 0.2～0.3 ℃. Air temperature increase has obviously influenced the ground temperature down to 20 m deep and has slight effect on the deeper soil. In this paper, analyzing the observed ground temperature data in representative permafrost areas along the Qinghai-Tibetan Railway, it is revealed that the ground temperature of the upper frozen soil has increased with an influence depth of 40 m.

关 键 词：青藏铁路 高原冻土 地温场 气温 工程地质条件 

分 类 号：U216.41[交通运输工程—道路与铁道工程] P642[天文地球—工程地质学]