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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。
The uniaxial creep tests of the remolded loess at three loading stresses are discussed. The viscoelasticity is analyzed by Burgers model. Origin7.5 software was used to fit the model parameters to get the general formula of viscoelastic constitutive equation of remolded loess. The predictive value of the model and the test results are compared, and the influence of the model parameters on the creep process is analyzed. The results show that the Burgers model can well reflect the viscoelastic properties of the remolded loess, and the stress-strain isochron curve shows that the rheological behavior of the remolded loess shows obvious nonlinear characteristics, while the elastic parameters of the model determine the creep The initial position of the process (t = 0), the elastic parameter E2 controls the first-stage curve range, the viscosity coefficient 1η determines the second-stage creep curve slope, and the viscosity coefficient η2 controls the first-stage creep curve curve degree.