摘要
用1.2MPa外载固结并冻结的高岭粘土与2mol浓度的氯化钠低温溶液相接触,由于冻土与盐溶液间的水势梯度,引起等温条件下,水分和盐分从溶液向冻土中迁移。冻土中部分区段由于含盐浓度增高,冰点下降、冻土融化并产生吸热效应。融化界面以上的冻土中,由于水分积聚,冰分凝,形成条带状构造并产生放热效应。冻土出现以冻胀为主的变形。水、盐迁移通量及变形量随时间按指数规律衰减并随外载增大和温度降低而减小。
When the frozen kaolin is connected with the NaCl solution of 2 mol, the water and ion migrat in the direction from solution to frozen soil by the driving force of water potential gradient between frozen soil and solution under the isothermic condition. A section of frozen soil is thawed and appeared as endothermic reaction by increasing in salt concentration and by freezing point depression. The ice strip is occurred in the frozen kaolin nearby the thawing interface and appeared as exothermic reaction by water accumulation and ice segregation.Deformation is appeared in the frozen kaolin mainly in the form of frost heaving. The flux of water and ion migration and the amount of deformation is decreasing with the elapsed time in the power law and with increasing in the overburden pressure and with temperature depression.
出处
《冰川冻土》
CSCD
北大核心
1992年第4期289-295,共7页
Journal of Glaciology and Geocryology
关键词
冻土
溶液
热质迁移
变形
frozen soil, solution, heat and mass transfer, deformation
