基于细观力学的盐岩蠕变损伤本构模型研究

STUDY ON CREEP DAMAGE CONSTITUTIVE MODEL OF SALT ROCK BASED ON MESOMECHANICS

在对盐岩在蠕变试验中所表现的损伤特征认识基础上,利用对应性原理建立了基于细观力学的盐岩蠕变损伤本构模型。该模型能够体现考虑损伤和不考虑损伤的蠕变力学过程的巨大差别,应变率随着有效蠕变应力的增大而增大的特征,及在一定畸应力作用下随着静水压力的增大蠕变应变率变小的特征。

The damage behaviors induced by creep of salt rock are analyzed with creep experiments. A nonlinear creep constitutive model is given to represent the process of salt rock creep using correspondence principle based on mesomechanics. The model can reflect the characters of the difference between the model considering damage and that without considering damage, the strain rate increasing with the increase of effective stress; and the strain rate decreasing with the hydrostatic pressure.