基于模型理论和遗传蠕变理论的改良膨胀土非线性流变研究

为研究膨胀土非线性流变，取水泥改良膨胀土样进行长期一维压缩试验，得到了改良膨胀土在不同应力水平下的应力-应变等时曲线簇。将曲线反映的非线性流变分解为线性黏弹性蠕变变形、线性黏塑性蠕变变形和非线性黏塑性蠕变变形三部分。基于模型理论和遗传蠕变理论建立了各部分流变模型，其中在线性黏弹性蠕变变形和线性黏塑性蠕变变形部分采用模型理论建立元件模型，在非线性黏塑性蠕变变形部分运用遗传蠕变理论建立积分蠕变方程，结合试验数据拟合出材料和方程参数，用该模型得到的蠕变曲线与实测结果能较好吻合。

Study of nonlinear rheology of improved expansive soil based on model theory and genetic creep theory

In order to research the nonlinear rheology of expansive soil, the samples of cement-improved expansive soil have been selected to conduct the long-term one-dimensional compression tests. The stress-strain curve family for the improved expansive soil under different stress levels has been gained. The nonlinear rheology reflected by the curve can be divided into the linear viscoelastic creep deformation, linear viscoplastic creep deformation and nonlinear viscoplastic creep deformation. Based on the model theory and genetic creep theory, the rheology model for every category has been built accordingly. For the linear viscoelastic creep deformation and linear viscoplastic creep deformation, the model theory has been adopted to build the component model. For the nonlinear viscoplastic creep deformation, the genetic creep theory has been utilized to formulate the integral creep equation. The materials and equation parameters have been gained through the fitting of experimental data. It is found that the creep curve is consistent with the experimental result well.