重塑黄土动态回弹模量依赖性分析及预估模型

为明确重塑黄土动态回弹模量的应力依赖性，借助室内重复加载三轴试验，研究了在16种应力路径、3个压实度和4个含水量状态下黄土动回弹特性.试验结果表明：含水量越高时偏应力和围压影响较体应力显著，含水量越低时偏应力和体应力影响较围压显著.低偏应力条件下，含水量对低压实度黄土的回弹模量影响显著，反之高偏应力条件下含水量则对高压实度黄土回弹模量影响显著；回弹模量在含水量大于等于最佳含水量时，受偏应力和体应力影响显著，而在含水量小于最佳含水量时受偏应力和围压影响显著.鉴于此，提出以Ni模型为基础，在不同湿度阶段采用不同的应力控制参数的两阶段动态回弹模量预估模型，从而精准表达黄土路基性能参数.
To investigate the stress dependency of the dynamic resilient modulus (MR) of remodeled-loess, the dynamic triaxial tests were conducted under 16 stress paths, 3 degree of compactions and 4 water contents. The research results show that the effect of deviatoric stress and confining pressure are more significant than the bulk stress when the water content is higher, while the effect of deviatoric stress and bulk stress are more significant than confining pressure when the water content is lower. For the loess with low compaction degree, MR is significantly affected by the water content under low deviatoric stress conditions, while for loess with high compaction degree, MR is significantly affected by the water content under high deviatoric stress conditions. MR is significantly affected by deviator stress and bulk stress when ω