This paper aims to assess the characteristics of the deformation and strength behavior of frozen soils at different temperatures under monotonic and cyclic triaxial conditions. The deformation and failure patterns of the specimens change from ductility to brittleness with decreasing temperatures under both monotonic and cyclic loadings. The development of axial strain and stiffness with increasing number of cycles for the soils under cyclic loading is presented and analyzed in detail. A collapse behavior in strength and stiffness is observed in tests of frozen soils at − 5 °C, − 7 °C and − 9 °C. The difference in frictional sliding between the samples with high ductility and those with high brittleness is attributed to the different patterns of deformation and failure. The dynamic modulus is plotted versus axial strain, and the state where the stiffness begins to decrease is employed as the criterion of cyclic failure. The proposed criterion of cyclic failure is verified to be more suitable for frozen soils with high brittleness and seems to be consistent with the peak strength under monotonic loading. Finally, the cyclic stress ratios are plotted against the number of cycles up to this failure criterion, and the effect of temperatures on cyclic strength is evaluated.

中文翻译：

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冻土粉质黏土在单调和循环三轴荷载作用下的性能研究

本文旨在评估单调和循环三轴条件下不同温度下冻土的变形和强度特性。在单调和循环载荷下，随着温度的降低，试样的变形和破坏模式从延性变为脆性。给出并详细分析了循环荷载作用下土体轴向应变和刚度随循环次数的增加情况。在− 5°C，− 7°C和− 9°C的冻土测试中，观察到强度和刚度的崩溃行为。具有高延展性的样品与具有高脆性的样品之间的摩擦滑动的差异归因于变形和破坏的不同模式。动态模量与轴向应变的关系图 刚度开始下降的状态被用作循环破坏的判据。经验证，所提出的循环破坏准则更适用于高脆性的冻土，并且似乎与单调荷载下的峰值强度一致。最后，将循环应力比相对于达到该破坏标准的循环次数作图，并评估温度对循环强度的影响。