首先介绍一个建立在热动力框架的宏观损伤模型,热动力势是宏观应变和损伤的函数,损伤则是一个标量。通过引入粘滞系数建立一个粘弹性损伤模型,来描述脆性材料的力学特性随损伤和时间的演化过程。运用模型对单轴拉伸、单轴压缩、蠕变和松弛等实验进行预测,模型预测能正确地描述脆性岩石的力学特性。 First, a macroscopic damage model based on the thermodynamic framework is introduced. The thermodynamic potential is a function of macro-strain and damage, and damage is a scalar. By introducing a viscoelastic coefficient, a viscoelastic damage model is established to describe the mechanical properties of the brittle material as the damage and time evolve. The model is used to predict the uniaxial tension, uniaxial compression, creep and relaxation. The model prediction can correctly describe the mechanical properties of brittle rocks.