改进的蠕变模型及其稳定性

Modified Creep Model and Its Stability

为了反映岩石的蠕变特性,根据对岩石蠕变曲线和蠕变模型的分析,采用负弹性模量和非理想粘滞体模型,提出了一种蠕变模型:H-K-VP-(H‖-N‖St.V)(-N为非牛顿粘滞体模型);通过理论分析及用该模型对页岩岩样单轴压缩蠕变实验数据进行拟合,表明该模型能够反映岩石的各种蠕变性态,尤其是加速蠕变过程;对模型的稳定性进行了分析,表明岩石的物性参数是影响岩石蠕变稳定性的重要因素。

In order to express the creep characteristics of rock, a creep model, H- K- VP-（H‖N^-‖St. V）, where is a non-Newtonian viscosity mode, is put forwarded, according to the analysis of the creep curves and model of rocks by adopting of negative elasticity module and non-ideal viscosity model. Through the theoretical analysis and data fitting, the data is obtained from uniaxial compression creep test of shale specimens by application of modified model. The results show that the model can express various characteristics of rock creep, especially in the process of accelerating creep, furthermore, the stability of the modified model is analyzed, the outcome shows that physical parameter of rock is aimportant factor of influencing the rock creep stability.