中文摘要：

以陕西关中地区杨凌Q3黄土为研究对象,进行了经历冻融循环作用的非饱和重塑黄土的单向固结蠕变试验,获得了各级法向压力下的蠕变曲线簇,研究了冻融循环次数、法向压力对冻融黄土固结蠕变特性的影响。结果表明：法向应力水平对冻融黄土蠕变有较大的影响,法向应力越大,冻融黄土的应变就越大;冻融循环次数对黄土固结蠕变也有一定的影响,表现为在一定范围内,黄土应变随冻融次数的增加而增加。根据蠕变曲线形态特征,建议用Burger元件模型来描述冻融黄土的固结蠕变特性;推导冻融黄土在单向固结条件下的时间—应变关系模型,并拟合得到了其中的参数。

英文摘要：

Taking the Q3 loess of Yangling District in Shaanxi Province as the research object,an uniaxial consolidation compression test is conducted to obtain the creep characteristic curves of remolded unsaturated loess after freezing-thawing cycling under different normal stresses.We analyze the influence of freezing-thawing cycles and normal stress on creep consolidation characteristics.The results indicate that： the normal stress influences the creep consolidation characteristics of freezing-thawing loess obviously,and the strain of loess increases with the normal stress;the freezing-thawing cycle times also influences the creep consolidation characteristics of freezing-thawing loess,namely,the strain of loess increases with freezing-thawing cycle times in some extent.According to creep curve form,the Burger model is suggested to describe the creep consolidation characteristics of freezing-thawing loess;a one-dimensional consolidation creep time-strain model of freezing-thawing loess is established and the model parameters are obtained.The relation can well simulate the creep characteristics of freezing-thawing loess in Yangling District for its satisfying parameter correlation.