冻融条件下盐渍土水盐迁移规律研究

Research on the Moving Pattern of Water and Solute Migration Under Freezing and Thawing Cycles

选取典型天然盐渍土,在开放系统中进行反复冻融循环条件下的试验研究。从土类角度研究了天然盐渍土在多次冻融循环时的水分和盐分迁移规律。试验结果表明：经多次冻融循环,低液限粘土试样水分重分布与盐分重分布有很大的一致性,水分和盐分自下而上迁移;含砂低液限粘土试样冻融循环过程中,易溶盐均随水分向冷端面迁移,离子剖面呈现中间大两端小的趋势。

The representative crude saline soil samples were selected for the experiment of freezing and thawing cycles in our laboratory.Moving patterns of water and solute migration of the representative crude saline soils were researched with kinds of soil.The result of the test shows that moving patterns of water and solute of low liquid-limit clay are identical,and water and solute migrate upwards.The distribution of cohesion of low liquid-limit clay decreases linearly from bottom to top.Both the water and the easy solute salt of bearing sand low liquid-limit clay move to the cold end under freezing and thawing cycles and the profile of ion concentration is bigger in the middle than both sides.