关键词: 重塑黄土, 三轴蠕变试验, 蠕变特性, 经验蠕变模型

Abstract: A series of laboratory consolidated drained triaxial creep tests is performed with triaxial creep apparatus SR-6 to investigate the behaviors of the remolded loess from a loess slope of Jingyang in Shaanxi province. The tests focus on studying the creep characteristics of remolded loess with a 90% compaction degree under different water contents and confining pressures. Based on the experimental data, two different empirical models are developed. The results indicate that the loess in this area has obvious rheological properties, general showing a nonlinear attenuation creep. The creep behaviors of the loess are significantly influenced by confining pressure and water content. When the sample is under the conditions of smaller confining pressure and higher moisture, it exhibits notable creep companied by the bigger creep strain. A sudden increase in strain increment caused by equal load increment indicates that this level of load exerted on sample has exceeded the yield stress value of soil, and soil sample will produce sticky plastic deformation. Both models can aptly describe creep properties of loess under the partial stress levels between 20% and 65% and also have fewer parameters and easier method of obtaining parameters.

Key words: remolded loess, triaxial creep test, creep characteristics, empirical creep model