This paper investigates the shear properties of the interfaces between sand and short-staple nonwoven geotextile (GT1), long-staple nonwoven geotextile (GT2), and geomembrane (GM) under varying conditions of testing temperature, sand moisture content, and normal stress through temperature-controlled direct shear tests. The results reveal that the shear stress-shear displacement curves for the sand-GT1 and sand-GM interfaces can be broadly categorized into an elastic deformation stage, a nonlinear growth stage, and a stable stage. However, the sand-GT2 interface displays a continuously increasing trend throughout the experiment. The peak friction angles of the interfaces increase significantly as the temperature decreases, following the order GT1 > GT2 > GM. The average residual friction angle of sand with GT1, GT2, and GM decreased by 14.8%, 10.4%, and 31.1%, respectively, compared to the peak friction angle. The peak cohesion at the sand-GM interface is relatively weaker than that at the sand-GT1 and sand-GT2 interfaces. The shear mechanisms between frozen soil and geotextiles involve ice cementation, rolling, interlocking, and fiber tensioning, while the shear mechanisms between frozen soil and GM comprise ice cementation, rolling, indentation, and plowing.

中文翻译：

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土工合成材料特性对其在与冻土界面处剪切行为的影响


本文通过温控直接剪切试验，研究了沙子和短纤维非织造布土工布 （GT1）、长纤维非织造布土工布 （GT2） 和土工膜 （GM） 之间在测试温度、沙子水分含量和法向应力不同条件下界面的剪切性能。结果表明：sand-GT1 和 sand-GM 界面的剪切应力-剪切位移曲线大致可分为弹性变形阶段、非线性生长阶段和稳定阶段。然而，sand-GT2 界面在整个实验过程中显示出持续增加的趋势。界面的峰值摩擦角随着温度的降低而显著增加，遵循 GT1 > GT2 > GM 的顺序。与峰值摩擦角相比，GT1、GT2 和 GM 的沙子的平均残余摩擦角分别降低了 14.8%、10.4% 和 31.1%。sand-GM 界面的峰内聚力相对较弱于 sand-GT1 和 sand-GT2 界面。冻土与土工布之间的剪切机制涉及冰胶结、滚动、联锁和纤维张紧，而冻土与转基因之间的剪切机制包括冰胶结、滚动、压痕和犁地。