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《Journal of Glaciolgy and Geocryology》 2001-04
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Influence of Climate Warming on Permafrost Table Studied with Different Models and Temperatures

FENG Wen jie 1 , LI Dong qing 1 , MA Wei 1 ZHANG Lu xin 2 (1. State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou Gansu 730000, China; 2.Northwest Branch, Chinese Academy of Railway Sciences, Lanzhou Gansu 73  
Model tests are conducted for studying the influence of air temperature rising on permafrost table under three conditions (without riprap and awning, with riprap, with riprap and awning). All tests were warmed up twice by different freeze-thaw cycle upon a basic temperature, with a temperature step of 0.50 ℃. The scale of the model that simulates the cutting is 1∶20. The length, width and height of the model are 140 cm, 70 cm and 70 cm, respectively. Loam from the Fenghuoshang region of the Qinghai Tibetan Plateau is used in the model test, of which the initial dry unit weight is 1 500 kg·m -3 and the initial moisture content is 21%. The tests were performed in the State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS. First, the model was kept at -16.10 ℃ under the nature condition for 3 days. Afterwards, the temperature of the soil surface was warmed up and then cooled down repeatedly in the manner of -16.1~5.8~-13.30 ℃, -15.6~6.3~-12.80 ℃ and -15.1~6.8~-12.30 ℃ in turn. Then, riprap, 0.2~1.0 cm in particle diameter and 2 cm in thickness (simulating actuall thickness of the blocked stone of 40 cm), was added to protect the slopes of the cut, and kept at -16.10 ℃ for 3 days, and then the repeatedly warming and cooling mentioned above was performed. Finally, awning, 30 cm in height (simulating actuall awning height of 6.0 m), was added to the model, and then kept at -16.10 ℃ for 3 days, and then the repeatedly warming and cooling mentioned above was performed. It is found from the tests that there is an obvious influence on the permafrost table under the protection of riprap and the awning, and the change of permafrost table is positively relating to air temperature. With the climate warming up, the permafrost table will descend step by step. But at the same temperature, using the riprap and the awning can uplift obviously the permafrost table, specially at high temperature. The effect is more obvious when jointly using riprap and awning. Therefore, using riprap to protect the cut slopes must be considered more and more in the engineering constructions in cold regions, because it is cheaper. Under special condition, it is necessary to jointly use riprap and awning. In this way, it is very good to reduce the frost heaving and thaw collapse of the road and canal etc. in cold regions.
【Fund】: 中国科学院知识创新工程重大项目 (KZCX2 30 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 15 )资助
【CateGory Index】: P642.14
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