To investigate the effects of traffic loads on frost heave behaviors, frost heave tests of silty clay soil were conducted using an improved temperature-controlled cyclic compression-shear device. This research employed three stress modes: vertical cyclic stress, horizontal cyclic shear stress, and complex cyclic stress that combines vertical cyclic stress with horizontal cyclic shear stress. Additionally, it considered the effects of the amplitude and frequency of complex cyclic stress. Test results show vertical cyclic stress densifies specimens and restrains vertical displacement development. Vertical cyclic stress's pumping effect promotes water absorption during frost heave. Horizontal cyclic shear stress can increase in-situ frost heave and induce minor consolidation than vertical cyclic stress, dramatically enhancing vertical displacement. Under complex cyclic stress conditions, vertical cyclic stress and horizontal cyclic shear stress at low amplitudes and frequencies enhance vertical displacement. The primary component that promotes the frost heave ratio is horizontal cyclic shear stress, which could lead to a looser frozen soil structure. Finally, an improved frost heave ratio prediction model was developed, considering the influences of vertical cyclic stress, horizontal cyclic shear stress, and loading frequency.

中文翻译：

---

循环应力影响下路基粉质粘土冻胀特性：试验与预测模型


为了研究交通荷载对冻胀行为的影响，采用改进的温控循环压剪装置对粉质粘土进行了冻胀试验。本研究采用了三种应力模式：垂直循环应力、水平循环剪应力以及垂直循环应力与水平循环剪应力相结合的复杂循环应力。此外，它还考虑了复杂循环应力的幅度和频率的影响。测试结果表明，垂直循环应力使样本致密化并抑制垂直位移的发展。垂直循环应力的泵送效应促进了冻胀过程中的吸水。与垂直循环应力相比，水平循环剪应力可以增加原位冻胀并引起较小的固结，从而显着增强垂直位移。在复杂的循环应力条件下，低振幅和频率的垂直循环应力和水平循环剪应力会增强垂直位移。提高冻胀率的主要成分是水平循环剪应力，这可能导致冻土结构更松散。最后，考虑竖向循环应力、水平循环剪应力和加载频率的影响，建立了改进的冻胀率预测模型。