人工制备遗址土蠕变试验研究

Experimental study on creeping of artificial ruin soils

为了研究糯米浆对土蠕变特性的影响,用不同含水量、不同糯米浆掺入量配制人工制备遗址土。通过单轴蠕变试验,研究了不同压力条件下人工制备遗址土的蠕变特性。试验结果表明:含水量越大,蠕变现象越明显。随着糯米浆掺量的增加,人工制备遗址土的蠕变量呈现出先减小后增大的趋势,在土与糯米浆质量比为90:10时,蠕变量达到最小。根据试验结果,分别建立了适合人工制备遗址土蠕变特性的经验蠕变模型和基于分数阶微积分的非线性黏弹性模型。通过对比发现,基于分数阶微积分的非线性黏弹性模型能弥补传统经验模型不能描述瞬时应变的缺陷,更好地反应人工制备遗址土的蠕变特性。

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.