This paper summarizes the results of a laboratory testing program that was conducted to determine the effects of moisture content on the shakedown limits of unbound granular base materials. Two different types of granular base materials were investigated in this study, namely limestone and sandstone. Multi-stage repeated load triaxial tests were performed on these materials. The results of the tests were analyzed within the framework of the shakedown theory. The results indicate that the moisture content had an influence on the slope of the elastic and plastic shakedown limits lines. The effect of the moisture content was more pronounced on the slope of the elastic shakedown limit line, however. The moisture content affected the intercept of the elastic and plastic shakedown limits lines more significantly than the slope of these lines. The limestone material exhibited greater decrease in the intercept of the elastic and plastic shakedown limits with increase in moisture content compared with the sandstone material. This was explained by the limestone’s finer gradation.

本文总结了一项实验室测试程序的结果，该程序旨在确定水分含量对未结合的颗粒状基础材料的沉降极限的影响。在这项研究中，研究了两种不同类型的颗粒状基础材料，即石灰石和砂岩。在这些材料上进行了多阶段重复载荷三轴试验。测试结果在组合理论的框架内进行了分析。结果表明，水分含量对弹性和塑性减振极限线的斜率有影响。但是，水分含量的影响在弹性减振极限线的斜率上更为明显。水分含量对弹性和塑料减振极限线的截距的影响远大于这些线的斜率。与砂岩材料相比，随着水分含量的增加，石灰石材料在弹性和塑性减振极限的截距上表现出更大的降低。石灰石的精细级配可以解释这一点。