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Freeze-thaw cycling impact on the shear behavior of frozen soil-concrete interface

机译：冻融循环对冻土-混凝土界面剪切特性的影响

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The shear behavior of a frozen soil-structure interface plays a vital role in analyzing the performance of engineered structures in cold regions. This study investigates the freeze-thaw cycling impact on the shear behavior of a frozen soil-concrete interface by direct shear tests. Test specimens consisting of a Portland cement concrete disk and frozen loess with an initial moisture content ranging between 9.2% and 20.8% were prepared and conditioned at various sub-zero temperatures (i.e., -1 degrees C, -3 degrees C, and- 5 degrees C) and freeze-thaw (F-T) cycles (i.e., 0, 5, 10, and 20). Experimental results, including shear stress - horizontal displacement curves, the displacements and shear strengths at both peak and residual status, are presented and analyzed. In particular, the influence of F-T cycling on shear behavior is examined. The peak displacement is found to increase linearly with increasing initial moisture content, but their correlation weakens as the number of F-T cycling increases. However, the residual displacement is found to be insensitive to the initial moisture content, temperature, normal stress, and F-T cycling. While the residual friction angle is slightly larger than the peak one before F-T cycling, both gradually increase with an increasing number of F-T cycling. Large cohesion in the peak strength, especially at lower temperatures, completely diminishes in the residual strength due to damage of ice bondage, resulting in a significant shear strength loss between the peak and residual status. The impact of F-T cycling on the interface shear behavior can be attributed to moisture migration toward, formation and accumulation of ice films at the interface. The findings from this study including the shear strength parameters and the displacements at both peak and residual status, can be used to simulate the performance of engineered geotechnical assets such as pile foundations, retaining walls, and earth dams or irrigation channels with concrete linings in cold regions.
机译：冻结的土壤-结构界面的剪切行为在分析寒冷地区工程结构的性能中起着至关重要的作用。这项研究通过直接剪切试验研究了冻融循环对冻土-混凝土界面剪切行为的影响。制备了由波特兰水泥混凝土圆盘和冻土组成的试样，其初始含水量在9.2％至20.8％之间，并在各种零下温度（即-1摄氏度，-3摄氏度和-5摄氏度）下进行了处理。摄氏度）和冻融（FT）周期（即0、5、10和20）。给出并分析了包括剪切应力-水平位移曲线，峰值和残余状态下的位移和剪切强度在内的实验结果。特别是，研究了F-T循环对剪切行为的影响。发现峰值位移随初始水分含量的增加而线性增加，但随着F-T循环次数的增加，其相关性减弱。但是，发现残余位移对初始水分，温度，法向应力和F-T循环不敏感。虽然残余摩擦角略大于F-T循环前的峰值，但两者都随着F-T循环次数的增加而逐渐增加。峰值强度的大内聚力，特别是在较低温度下，由于冰粘结的破坏而使剩余强度完全降低，从而导致峰值和残留状态之间的剪切强度明显降低。 F-T循环对界面剪切行为的影响可归因于水分向界面处冰膜的形成，积累和迁移。这项研究的发现包括抗剪强度参数以及在峰值和残余状态下的位移，可用于模拟工程岩土资产的性能，例如桩基础，挡土墙，土坝或带有混凝土衬砌的灌溉渠道在寒冷的天气中地区。

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