Previous studies have centred on the long-term permanent deformation behaviour of soil under traffic loading while neglecting the dynamic parameters as it is affected by cycle number. In this study, forty tri-axial dynamic tests were conducted to assess the effects of cycle number, confining pressure, and dynamic stress on the dynamic modulus and damping ratio of compacted loess. Empirical models of both parameters were established and examined, from which emerged a nearly linear relationship between the dynamic stress-strain points when dynamic stress fell below a given threshold value. The representative dynamic modulus in the linear range initially increased and then decreased. The maximum representative dynamic modulus linearly increased as confining pressure increased, while confining pressure had no clear effect on the damping ratio. As the dynamic stress increased, the damping ratio was initially stable and then gradually increased until becoming stable again at a higher level.

以往的研究主要集中在交通荷载下土壤的长期永久变形行为，而忽略了动态参数，因为它受循环次数的影响。本研究通过40个三轴动态试验来评估循环次数、围压和动态应力对压实黄土动态模量和阻尼比的影响。建立并检查了这两个参数的经验模型，当动态应力低于给定阈值时，动态应力-应变点之间的关系几乎呈线性。线性范围内的代表性动态模量先增大后减小。最大代表动态模量随着围压的增加线性增加，而围压对阻尼比没有明显影响。