关键词: 岩土工程, 遗址土, 蠕变, 分数阶微积分, 非线性黏弹性模型

Abstract: Glutinous rice pulp has a great influence on the strength of ancient ruin soil. To study its effect on soil creeping properties, we prepare artificial ruins adding different water contents and different amounts of glutinous rice paste, conduct uniaxial creep tests, and examine the creeping properties of these artificially prepared ruins under different pressure conditions. The test results show that larger water content results in more obvious soil creeping. As the amount of added glutinous rice pulp is increased, the creep shows a trend of decreasing first and then increasing, and it reaches its minimum value when the mass ratio of soil to glutinous rice is 90:10. To simulate the creeping properties of the artificial ruin soils, we develop an empirical creep model and a fractional calculus-based nonlinear viscoelastic model. Comparison indicates that this nonlinear model can make up for the defect of traditional empirical models that fail to describe instantaneous strain, thus better reflect the creeping characteristics of artificial ruin soils.

Key words: geotechnical engineering, ancient ruins, creep, fractional calculus, nonlinear viscoelastic model