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《Journal of Glaciology and Geocryology》 2003-01
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Analysis on the Thawing of Permafrost underlying Qinghai-Tibetan Highway

SHENG Yu 1, LIU Yong-zhi 1, ZHANG Jian-ming 1, WU Jin-min 2, ZHANG Jin-zhao 2 (1. State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou Gansu 730000, China; 2. First Highway Survey and Design Institute, Ministry of Communication of China, Xian Shaanxi 710068, China)  
Construction of the Qinghai-Tibetan Highway will change the heat exchange between atmosphere and ground surface, destruct the original heat balance, resulting in a heat accumulation in highway embankment and underlying permafrost and permafrost thawing. This is the greatest problem in the construction in permafrost regions. General principle for the construction of the highway is to try to keep the underlying permafrost from thawing. In order to realize the purpose, it is very important to have a good understanding of the thawing state of permafrost underlying the highway embankment. Based on two series of observations of ground temperature profile, both in high temperature and low temperature regions, the thawing state of permafrost underlying the highway is stated, and the heat penetrating into permafrost is analyzed in this paper. It is revealed that the ground temperature near the highway surface is obviously higher than that of natural ground surface, and that the thawing period of the highway embankment is longer than that of natural ground. Permanent thawed layer has formed in high temperature regions. The heat budget within the permafrost underlying the highway shows a continuous heat-taking state in high temperature regions. The heat income within the permafrost in low temperature regions is greater than the heat release from the permafrost during an annual period. It is the high temperature (near 0 ℃) and continuous heat accumulation in high temperature regions that induces the thawing of the performed underlying the highway. The heat accumulation within the permafrost underlying the highway in low temperature regions is temporarily performing as permafrost temperature rising, and with increasing ground temperature, considerable thawing of permafrost is also possible.
【Fund】: 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 71);; 中国科学院知识创新工程重大项目 (KZCX2-30 6 ;KZCX1-SW- 0 4)资助
【CateGory Index】: P642.14
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