周期温度边界条件下一维融化固结特性研究

在周期温度边界条件下，冻土呈现出与常温边界不同的融化固结特性. 基于融化固结理论提出了一种适用于周期温度边界条件下融化固结计算的数值模拟方法，并通过试验验证了该方法的有效性. 通过对比分析试验及数值结果表明，提出的数值方法能够很好地描述周期温度边界条件下冻土的融化固结特性. 同时，融化深度和变形均随时间呈现出阶梯型的变化趋势. 这是周期温度边界下土体融化固结行为最显著的特点. 随着冻融次数的增加，融化深度和变形均趋近于常温边界条件下的结果，这表明若干个冻融循环后周期温度边界对融化固结行为的影响将逐渐消失.

One-dimensional thawing consolidation behavior with periodical thermal boundary

Compared with constant thermal boundary problem, frozen soil shows a completely different thawing consolidation behavior with the condition of periodical thermal boundary. In this paper, a new numerical simulation method was proposed to implement thawing consolidation calculation, and a series of thawing consolidation tests with corresponding thermal boundaries were conducted to verify the validity. It was verified that the predicted results have a good agreement with tested results. At the same time, changing tendencies of thaw depth and deformation both show a ladder-like pattern, which is the most significant feature for thawing consolidation behavior with periodical thermal boundary. With increasing of freezing-thawing cycles, thaw depth and deformation both tend to the values at constant thermal boundary, which implies the influence of periodical thermal boundary will disappear after several freezing-thawing cycles.