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Received:November 21, 2016  Revised:January 20, 2017  Click here to download the full text
Citation of this paper:,2017..Sciences in Cold and Arid Regions,9(2):112~119.
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Author NameAffiliationE-mail
Hu Zhang State Key Laboratory of Frozen Soils Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China barenleezekiel@yahoo.com 
JianMing Zhang State Key Laboratory of Frozen Soils Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China  
ZhiLong Zhang State Key Laboratory of Frozen Soils Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China  
MingTang Chai State Key Laboratory of Frozen Soils Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China  
基金项目:This project was supported by the National Natural Science Foundation of China (No. 41401087), the Independent Foundation of the State Key Laboratory of Frozen Soil Engineering (No. SKLFSE-ZT-35), and the Foundation for Excellent Youth Scholars of CAREERI, CAS (No. Y551C91001), and the Technology Program of Qinghai Traffic Science Institute (No. Y490E21001).
 
Abstract:Creep is an important mechanical behavior of frozen soils, one which can cause many problems for the infrastructures in permafrost regions on the Qinghai-Tibetan Plateau. To access the natural creep properties of in situ permafrost for explaining the engineering instability and predicting long-term deformation, conducting field tests is necessary. The paper reports on a group of plate loading tests we carried out over many years on the Qinghai-Tibetan Plateau. The results show that the ground temperature at the loading plates ranged from -0.29 ℃ to -3.03 ℃, and the mean annual ground temperature increased year by year in a linear fashion. Affected by the ground-temperature variations, two forms of deformation curves, a step-form and a wave-form occurred, depending on the relative extent of settlement in warm seasons and frost heave in cold seasons. Overall, the deformations of permafrost were characterized by settlement. The deformation magnitudes and curve styles of permafrost are different at different locations attributing to the influence of ground temperature and moisture content. Due to the existence of much unfrozen water in warm frozen soils, consolidation resulting from migration of unfrozen water along seepage channels may play a significant role in the settlement of permafrost. The research can provide a credible reference for engineering in the permafrost regions and the numerical computation of settlement.
keywords:creep behavior  in situ permafrost  Qinghai-Tibetan Plateau  seasonal deformation
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