期刊论文

中文

自然灾害学报

1004-4574

2017

26

1

149-155

10.13577/j.jnd.2017.0118

(50978097):国家自然科学基金项目 (2010SK3047):湖南省科技厅资助项目 (Grant 50978097):National Natural Science Foundation (Grant 2010SK3047):Science and Technology Department-Funded Project in Hunan Province

本校为第一机构

通过对南宁膨胀土的三轴压缩蠕变试验,研究了该膨胀土的非线性蠕变特性。基于流变力学和分数阶微积分理论的蠕变模型,构建了可反映膨胀土非线性流变特性的本构方程和蠕变方程。为了更好地描述膨胀土的非线性流变行为,通过引入考虑应力水平影响的类粘滞系数,进一步改进了软体元件。研究发现,膨胀土的非线性蠕变过程可以通过调整分数阶次β_1和β_2进行有效地模拟。研究结果表明,所建立的模型能完整地描述膨胀土的粘-弹-塑性变形,且模型分析结果与试验结果非常吻合,为计算膨胀土地基在长期荷载作用下的变形提供了理论依据,也对进一步探索膨胀土的应力松弛和长期强度等流变特性具有理论意义。

The nonlinear creep characteristics of Nanning expansive soil were been studied through a series of indoor triaxial creep compression tests of the soil. Based on creep model of rheological mechanics and fractional calculus theory, the constitutive equation and creep equation which may reflect the nonlinear rheological characteristic of expansive soils were constructed. In order to describe the nonlinear rheological charateristics of expensive soil better, the soft-matter element was modified furthermore by introducing an apparent viscosity coef...