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试验结果表明,土柱端面温度周期变化,导致土柱中冻融界面上下移动,这是成冰的必要条件。由于真空渗透机制,水分被抽吸到冻融界面附近并在那里成冰。有外界水源补给是成冰的充分条件。它导致反复冻融循环时冰层厚度不断增加。冰层的位置和厚度取决于冻融界面的位置和冻融循环的次数。如果每次冻融循环后,冻融界面的位置保持不变,则形成较厚的冰层。在每次冻融循环中,如果融化深度大于冻结深度,则只能形成一层薄冰层。反之,如果融化深度小于冻结深度,则经多次冻融循环后,可以形成多层薄冰层。
The experimental results show that the temperature change of the soil column end cycle causes the freeze-thaw interface in the column to move up and down, which is a necessary condition for ice formation. Due to the vacuum infiltration mechanism, moisture is drawn into the vicinity of the freeze-thaw interface where it forms ice. External water supply is a sufficient condition for ice formation. It leads to a continuous increase in the thickness of the ice layer during repeated freeze-thaw cycles. The location and thickness of the ice layer depends on the location of the freeze-thaw interface and the number of freeze-thaw cycles. If the freeze-thaw interface remains the same after each freeze-thaw cycle, a thicker layer of ice forms. In each freeze-thaw cycle, if the melting depth is greater than the freezing depth, only a thin layer of ice can be formed. On the contrary, if the melting depth is less than the freezing depth, multiple thin ice layers can be formed after multiple freeze-thaw cycles.