岩石试件非线性蠕变模型及其参数确定

Non-linear creep model of rock and parameter determination

以改进的西原模型为基础,结合岩石的应力应变特征,对模型中的粘滞系数进行了改进,推导出的蠕变方程可描述岩石第三阶段的蠕变特性,同时对蠕变模型中的参数进行了确定;并运用MATLAB程序,结合实例作出改进蠕变方程的曲线及蠕变曲面并与通过实验所得曲线进行比较,改进的蠕变方程更能反映岩石的第三阶段蠕变变形。

Based on the modified elastic and visco-elasto-plastic model, we modified the viscosity coefficient of model combining the whole stress-strain characteristics of rock, and derived creep equation that can describe the third stage of rock creep character. At the same time the paper determined its parameters, and applying MATLAB, we can draw numerical curve of modified creep equation, and compares with the experimental curve, knowing that modified creep equation can reflect third creep deformation stage of rock, the method can put forward a new thought for studying the long stability of rock engineering.