流变物质对软土流变参数影响的蠕变试验

流变性是软土的一种长期变形特性，对软土地基的沉降产生重要影响。现有研究表明，软土中高黏性的流变物质是产生其流变特性的主要物质因素，当流变物质分布具有一定均匀性时其流变特性与流变物质的分布形态无关，仅与流变物质本身性质和含量比例相关。通过蠕变试验研究了流变物质对软土流变参数的影响，视强亲水性的膨润土微小颗粒为具有高黏性的流变物质，均匀地把其掺入到人工土试样中进行一维压缩蠕变试验，引入基于邓肯非线性弹性的流变元件模型对蠕变试验曲线进行拟合分析，根据流变物质含量确定流变模型参数的变化规律，建立了模型等效黏滞系数、等效弹性模量和邓肯非线性弹性模量与膨润土（流变物质）含量的关系。模型拟合分析发现，基于邓肯非线性弹性的软土流变元件模型与试验结果具有良好一致性，模型参数与流变物质含量之间关系为双曲线方程。

Analysis of creep test on effect of rheological material on soft soil rheological parameter

Rheology is a kind of long-term deformation characteristics of soft soil, which has an important influence on the settlement of soft soil foundation. Existing researches show that high viscous rheological material in soft soil is the material basis which produces rheological properties. When the soil rheological material size is less than the critical size, soil creep characteristics are only related to the content and properties of rheological material, but not related to its shape and distribution form. Through creep test to study the effect of rheological material on soft soil rheological parameters, regarding super-hydrophilic bentonite particles as rheological material with high viscosity, using artificial soil specimen evenly mixed with different bentonite contents to conduct one-dimensional compression creep experiment. Introducing component model based on Duncan nonlinear elasticity, fitting and analysis of the creep test curve are made. The change rule of rheological model parameters is determined for the first time; according to the properties and content of rheological material, The relations between equivalent viscous coefficient, equivalent elastic modulus, Duncan nonlinear elastic modulus and the content of bentonite (rheological material) is established. Model fitting analysis shows that the rheological component model based on Duncan nonlinear elasticity has a good consistency with the test results; and relationships between model parameters and rheological material content conform to the hyperbolic equation.