摘要
讨论了20℃时,重塑黄土在3种加载应力下的单轴蠕变试验。采用Burgers模型对其黏弹性进行分析。利用Origin7.5软件对模型参数进行拟合,得到重塑黄土黏弹性本构方程的一般表达式。对比模型预测值与试验结果,并分析模型参数对蠕变过程的影响。结果表明,Burgers模型能较好地反映重塑黄土的黏弹特性,且应力-应变等时曲线表明重塑黄土的流变表现出较明显的非线性特征,而模型的弹性参数E1确定了蠕变过程的初始位置(t=0),弹性参数E2控制了第一阶段曲线范围,黏性系数1η确定了第二阶段蠕变曲线的斜率,黏性系数η2控制了第一阶段蠕变曲线弯曲程度。
In this paper, uniaxial creep tests are conducted with remolded loess under 3 loading stress at 20 degree centigrade. The viscoelasticity is analyzed separately with Burgers model. After fitting the model parameters using Origin7.5 software, the constitutive equation expression of remolded loess＇s viscoelasticity can be obtained. The model predicted values and test results are contrasted, and the influence of model parameters to the creep equation is analyzed. The result indicates that Burgers model can reflect remolded loess＇s viscoelasticity well. And the stress-strain tautochrone indicates that the evolution of remolded loess displays the obvious misalignment characteristics. Besides, in Burgers model, elastic parameter El determines the initial position （t=0） in creep process, elastic parameter E2controls curve range in the first stage, viscosity parameterηdetermines the slope of the creep curve in the second stage, and vis- cosity parameterrη2 controls bending extent of the creep curve in the first stage.
出处
《公路》
北大核心
2011年第6期136-141,共6页
Highway
