Mechanisms discussion of frost heave and test verifications of moisture migration  

作　　者：Chang Yuan ChengSong Yang LianHai Zhang 

机构地区：[1]State Key Laboratory of Frozen Soil Engineering,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences

出　　处：《Research in Cold and Arid Regions》2014年第5期447-454,共8页寒旱区科学（英文版）

基　　金：the Project of the Natural Science Foundation of China (No.41271087);the Independent Foundation of the State Key Laboratory of Frozen Soil Engineering (Grant No.O9SF102011)

摘　　要：Herein we review research on the structure of the frozen fringe and one of its key characteristics（unfrozen water content）,and compare its current measurement methods,including pulsed nuclear magnetic resonance（NMR）,time-domain reflectometry（TDR）,calorimetry,thermometry,the sublimation method,and CT imagery.A freeze-thaw cycle experiment with remolded soil was conducted inside to verify the mechanism of frost heave,measuring such variables as soil-water potential,temperature,water supplement,and the position of the freezing front.Conclusions from the analysis of the experiment data are：（1） The soil-water potential,the water supplement,and the position of the freezing front vary with temperature; and（2） the temperature gradient induces the soil-water potential,which in turn provides a stable driving force for moisture migration.Herein we review research on the structure of the frozen fringe and one of its key characteristics（unfrozen water content）,and compare its current measurement methods,including pulsed nuclear magnetic resonance（NMR）,time-domain reflectometry（TDR）,calorimetry,thermometry,the sublimation method,and CT imagery.A freeze-thaw cycle experiment with remolded soil was conducted inside to verify the mechanism of frost heave,measuring such variables as soil-water potential,temperature,water supplement,and the position of the freezing front.Conclusions from the analysis of the experiment data are：（1） The soil-water potential,the water supplement,and the position of the freezing front vary with temperature; and（2） the temperature gradient induces the soil-water potential,which in turn provides a stable driving force for moisture migration.

关 键 词：soil-water potential frozen fringe temperature gradient water migration 

分 类 号：P642.14[天文地球—工程地质学] TV431[天文地球—地质矿产勘探]