石膏角砾岩流变特性及流变模型研究

石膏角砾岩蠕变试验结果表明其具有非线性及加速蠕变特性,因此提出2种非牛顿体粘滞元件,建立新的复合流变力学模型,推导了相应的一维和三维蠕变本构方程,对试验结果进行模拟。结果表明,该模型能较好地描述石膏角砾岩流变的全过程。

STUDY ON RHEOLOGICAL PROPERTIES AND MODEL FOR GYPSUM BRECCIAS

The creep tests of gypsum breccias are done;and the experimental creep curves and isochronous stress-strain curves are got,which display the properties of nonlinearity and accelerated creep. In order to describe these properties of gypsum breccias comprehensively,two viscous components of non-Newtonian fluid are put forward and are combined with conventional components to gain a new multiple rheological model. According to the new model,the corresponding one-dimensional and three-dimensional creep constitutive equations are deduced. Then the experimental creep curves are simulated using the new rheological model;and the results indicate that the new model can effectively describe the whole rheological process of gypsum breccias.