模拟季节冻土层影响的冻土墙模型试验

在季节冻土环境中使用人工冻结法时，由于季节冻土层与人工冻土共同存在，在前者影响下人工冻土墙的水平位移和制冷能量消耗与无季节冻土层时有显著不同。在改装的试验台上，通过使用水平冻结管形成季节冻土，用竖向冻结管形成冻土墙，施加水平荷载，模拟了6种季节冻土层温度条件下冻土墙的形成与开挖过程，以研究季节冻土层对冻土墙耗能、受力和变形性能的影响。结果显示，与无季节冻土层的情况相比，季节冻土层温度为-12 ℃时可减小冻土墙水平位移达8.79 mm，约占墙体总位移的52%，耗能量可减小40.4%。试验结果证明季节冻土层对冻土墙的影响不容忽视，在工程中应充分考虑季节冻土层的节能效应和变形约束能力。

Model test of frozen soil wall beneath seasonally frozen soil layer

Due to the existence of the seasonally frozen soil layer, there are significant differences in the horizontal displacement and energy consumption of refrigeration between the conditions with and without it. The refrigeration consumption and deformation performance of the frozen soil wall beneath seasonally frozen soil layer were studied; and the results show that the seasonal frozen soil with temperature -12 ℃ can reduce the frozen wall’s horizontal displacement by 23.8% and reduce the refrigeration consumption by 40.4%. It is very important to consider the effects of the frozen layer, also the reductions in energy consumption and horizontal deformation of the artificial frozen wall should be considered in engineering.