基于一维固结试验的压实黄土蠕变模型

运用高压固结仪对压实黄土进行了长期蠕变试验，试验结果发现，压实黄土有很明显的蠕变变形，蠕变变形占总变形的6%～23%。试样含水率越高，压实度越小，蠕变占总变形的比例也越大，随着应力水平的提高，蠕变占总变形的比例减小。提出了适合描述压实黄土变形规律的非线性经验蠕变模型，结合分层总和法，对此模型进行了验证，并运用此模型，研究了不同含水率、不同压实度下黄土高填方工后沉降的变化规律，发现工后沉降与填料压实度和含水率之间符合对数关系。若以工后沉降速率v < 0.1 mm/d为工后沉降稳定标准，则高填方沉降在工后200～650 d稳定，且压实度越高，含水率越低，沉降稳定需要的时间越长。

A creep model for compacted loess based on 1D oedometer test

A series of long-term 1D oedometer test on compacted loess has been conducted using a high pressure consolidometer. It is found that the compacted loess has remarkable creep deformation and the proportion of the creep deformation in total deformation can come up to 6%-23%. The creep deformation proportion goes higher as the water content of the sample increases and the compaction degree reduces. And the creep deformation proportion decreases with the increase of stress level. A nonlinear creep model, which can well describe the rules of post-construction settlement of compacted loess, is proposed. The validity of model is verified by comparing the results from proposed model with those from the layer-wise summation method. The proposed model is employed to examine the variation law of the post-construction settlement under the conditions of the different water contents and compaction degrees. It is found that there exist logarithmic relationships between the post-construction settlement and the compaction degree/ water contents. Supposing the velocity of the post-construction settlement v < 0.1 mm/d is the stabilized standard, the high embankment settlement trends to be stable in 200 to 650 days after construction. The higher the compaction degree is, the lower the water content is, the longer the time up to stable required is.