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Strength of undisturbed and reconstituted frozen soil at temperatures close to 0℃
Received:February 25, 2017  Revised:March 25, 2017  Click here to download the full text
Citation of this paper:XiaoDong Zhao,GuoQing Zhou,GuiLin Lu,Yue Wu,Wei Jiao,Jing Yu,2017.Strength of undisturbed and reconstituted frozen soil at temperatures close to 0℃.Sciences in Cold and Arid Regions,9(4):404~411.
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Author NameAffiliationE-mail
XiaoDong Zhao State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China zxd@cumt.edu.cn 
GuoQing Zhou State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China  
GuiLin Lu Xuzhou Urban Rail Transit Co. Ltd., Xuzhou, Jiangsu 221000, China  
Yue Wu State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China  
Wei Jiao State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China  
Jing Yu State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China  
基金项目:This research was supported by National Natural Science Foundation of China (No. 51304209), the Natural Science Foundation of Jiangsu Province of China (No. BK20141135), and the Fundamental Research Funds for the Central Universities (No. 2015QNA63).
 
Abstract:The strength of warm frozen soils in permafrost is fundamentally significant to estimate and predict the ground settlements from construction activities. A study was therefore initiated to assess the strength and its behaviors of undisturbed and reconstituted frozen soils at temperatures close to 0 ℃. A series of triaxial compression tests (TCT) were performed by using a developed testing apparatus and a matching specimen-preparation method. The confinement was applied from air pressure, the temperature in the specimen was maintained using two-end refrigeration, and multi-stage loading on a single specimen was adopted to determine the strength. The test results showed that the strength, both for the undisturbed and reconstituted frozen-soil specimens, was significantly dependent on the temperatures and independent of the applied confining pressures. Additionally, the strength of undisturbed frozen soils was about 1.6 times more than that for reconstituted frozen soils. These observations were closely associated with the structures existing between pore-ice and gravels with large diameters.
keywords:warm frozen soils  strength behaviors  undisturbed specimen
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