论文部分内容阅读
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。
The kaolin clay, which was consolidated and frozen with 1.2 MPa of external load, was brought into contact with a low temperature solution of 2 mol sodium chloride. Due to the gradient of the water potential between the frozen soil and the salt solution, moisture and salinity from the solution to the frozen soil caused by the isothermal condition were caused. migrate. In some sections of frozen soil, the concentration of salt increases, the freezing point decreases, the frozen soil melts and an endothermic effect is generated. In the frozen soil above the melting interface, ice accumulates due to moisture accumulation, forming a strip-like structure and generating an exothermic effect. Frozen soils are dominated by frost heave. The water and salt migration flux and deformation amount decay exponentially with time and decrease with increasing external load and decreasing temperature.