不同应力状态下多杂质盐岩分数阶蠕变模型参数演化规律研究

Study on the Evolution of Parameters of Fractional Creep Model of Multi-impurity Salt Rock under Different Stress States

分数阶蠕变模型在描述非均质材料蠕变损伤特征方面具有良好的适用性,但当前分数阶蠕变模型的研究主要基于单一应力状态下的蠕变数据拟合。文章通过开展多杂质盐岩在不同围压下不同应力分级加载三轴蠕变试验,基于分数阶蠕变模型,通过对试验数据拟合辨识分数阶蠕变模型参数,分析参数随加载应力的演化规律,提出盐岩分数阶蠕变模型参数的演化模型,拓展了分数阶蠕变模型的应用范围,为盐岩分数阶蠕变模型在盐穴储气库的实际工程应用提供基础。

Fractional creep model has good applicability in describing the creep damage characteristics of heterogeneous materials,but current research on fractional creep model is mainly based on the creep data fitting under a single stress state. By conducting more formation of impurities in different stress under different confining pressure loading triaxial creep test,creep model based on fractional order,based on experimental data fitting recognize fractional creep model parameters,analyzes the parameters along with the evolution law of load stress,put forward the formation creep model parameters of fractional order,to expand the application range of fractional order creep model. It provides the foundation for the application of fractional creep model of salt rock in salt cavern gas reservoir.