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《Journal of Glaciology and Geocryology》 2012-02
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Experimental Study of Integrated Temperature-Moisture-Load Effect on Subgrade during Freeze-Thaw Cycle

MAO Xue-song1,YANG Jin-feng1,ZHANG Zheng-bo2,ZHENG Xiao-zhong1,ZHOU Lei-gang1(Key Laboratory of Special Area Highway Engineering of Ministry of Education,Chang'an University,Xi′an Shaanxi 710064,China; Transportation Science Institute of Tibet,Lhasa Tibet,850001 China)  
In this paper,in order to study the variation characteristics of integrated effect of temperature field,moisture field and stress field on seasonally frozen soil inside subgrade,variation characteristics of hydrothermal and mechanical properties of soil inside subgrade during freeze-thaw cycle are analyzed from an experiment of freeze and thaw cycle on subgrade model in indoor,based on an independently developed test system for compositely modeling temperature-moisture-load.The results indicate that temperature variation is more at the beginning,with temperature gradient gradually decreasing from top to bottom;0 ℃ freezing front moves down continuously,and after subgrade top frozen,temperature gradient has great difference between the two segments upon and below the 0 ℃ separatrix;during the freezing process,water content in subgrade can be divided into frozen area with homo-stable unfrozen water,transition area with unfrozen water of fast phase change and unfrozen area with reducing moisture.During the thawing process,specimen has great temperature variation at first,and then becomes less and less;unfrozen water content is depend on temperature;water content is more in the middle and less in both ends.Under the composite effect of hydrothermal,the stress field is characterized by a resilient modulus of subgrade linearly increasing with frozen depth,but decreasing with thawed depth;resilient modulus of subgrade decreases with freeze-thaw cycles.When the cycles reach to 6,attenuation tends to be stable.The results show that coupling action of temperature and water is the key factor that controls the mechanical properties of soil in subgrade.
【Fund】: 国家自然科学基金项目(50708009);; 交通部科技项目(200731822301-1);; 2011年西藏自治区科技计划项目资助
【CateGory Index】: U416.168
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