In energy geostructures, the long-term shaft resistance is affected by cyclic thermo-mechanical loads associated with structural loads and cyclic thermal solicitations. This study aims to investigate the effect of monotonic and cyclic thermal loads on normally consolidated (NC) and overconsolidated (OC) kaolin clay–rough steel interface. The peak shear stress of interface increased with temperature while the critical state shear strength remained unchanged. For cyclic temperature tests, with applying ten temperature cycles (5–60°C) to NC kaolin–clay interface, significant thermal contraction was observed but the shear strength increased as much as one single heating test. NC interface contracted on heating whereas OC samples dilated. These results highlighted the impact of thermal cycles on clayey interface which was stress history dependent.

中文翻译：

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温度循环下黏土界面的能量桩皮肤摩擦

在能源地质结构中，长期轴阻力受与结构载荷和循环热诱导相关的循环热机械载荷的影响。本研究旨在研究单调和循环热载荷对正常固结 (NC) 和超固结 (OC) 高岭土-粗钢界面的影响。界面的峰值剪切应力随温度升高而增加，而临界状态剪切强度保持不变。对于循环温度测试，在 NC 高岭土 - 粘土界面应用十个温度循环（5-60°C）后，观察到显着的热收缩，但剪切强度增加了一次加热测试。NC 界面在加热时收缩，而 OC 样品膨胀。这些结果突出了热循环对粘土界面的影响，而粘土界面取决于应力历史。