Abstract:The damage and failure of brittle media are challenging and complicated issues in mechanics field. Earthquake is a kind of typical failure or instability of brittle medium. Taking earthquakes for example,some precursory phenomena can be observed before the occurrence of catastrophic failure,and the healing phenomenon will take place gradually after earthquakes in a long time. So the study on the damage-healing process of the earth crust media is very significant to earthquake prediction. The model of damage rheology proposed by V. Lyakhovsky is introduced at first,and the shortcomings of the model are analyzed using the data obtained by acoustic emission experiment of rock failure. Secondly,based on damage mechanics,Helmholtz free energy,considering the healing phenomenon of the earth crust media,a new damage-healing model is set up in one dimension,and the damage-healing pattern is calculated with numerical method. The damage-healing process of the media is simulated under load which consists of two parts,the constant loading rate and a sinusoidal perturbation,to simulate solid tidal stress;and the evolution of load/unload response ratio(LURR) during the damage-healing process is also investigated at the same time. The result shows that the LURR value successively experiences,i.e. abnormity appearing,rising to the peak value then decreasing sharply before the occurrence of the catastrophic failure. This result validates that LURR can describe the damage degree of materials quantitatively and is a good forecast of catastrophic failure,which also can provide solid basis for LURR method in physics.