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《Journal of Glaciolgy and Geocryology》 2002-01
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Deformation of Highway Roadbed in Permafrost Regions of the Tibetan Plateau

LIU Yong-zhi 1 , WU Qing-bai 1,2,ZHANG Jian-ming 1 , SHENG Yu 1 (1. State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou Gansu 730000, China; 2. Department of Earth Science, Nanjing University, Nanjing Jiangsu 210093, China)  
It is a very difficult to solve roadbed deformation in permafrost regions, especially thaw settlement in warm permafrost regions. Thawing and temperature rising due to asphalt pavement has a great influence on roadbed stability. In order to study the process of roadbed deformation for different permafrost types and geophysical environments, roadbed deformation was monitored. There are three monitoring sections with uniform vertical and transverse observation directions and spaces. Each section has four transverse profiles consisting of 5 monitoring points. The relative deformation is monitored by transit instrument for three years since 1998. It is observed twice a month. The following conclusions are obtained: ;(1)Both vertical and transverse deformations due to permafrost thawing show a positive non-uniform feature, with the maximum deformation in the road should other than in the central of roadbed due to the shift of the maximum thaw depth to the road should. ;(2)roadbed deformation of frozen soils includes frost heave and thaw settlement. Extensive frost heave occurs from December to January. Extensive thaw settlement occurs from April to July. In other months roadbed deformation is in the way of slow frost heave or thaw settlement.;(3)roadbed deformation mainly depends on mean annual ground temperature and engineering geological conditions of permafrost. For warm permafrost with mean annual ground temperature high than {-1.5} ℃, roadbed deformation extensively change with mean annual ground temperature. Roadbed deformation mainly appears in the section with high ice content, and the larger the ice content, the larger the thaw settlement.;(4)Non-uniform deformation of roadbed under thawing is due to the effect of asphalt pavement on permafrost. Its essential is that the absorption of asphalt pavement can results in engineering geological conditions worse, because of continuously changing permafrost thermal regime, permafrost temperature rising and ground ice thawing.
【Fund】: 中国科学院知识创新工程重大项目 (KZCX1 SW 0 4) ;; 国家自然科学基金重大研究计划 ( 90 10 2 0 0 6 );; 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 77;CACX2 10 0 47);; 南京大学博士后基金资助
【CateGory Index】: U418.5
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