Abstract：Based on the strength characteristics of rock micro-unit with Weibull distribution，a rock softening and damage constitutive model is established to reflect the full process of rock failure by using the stress-strain curve with parameter capable of rational description of micro-unit strength of rock. Moreover，the relationship between model parameters and confining pressure is discussed and the model parameters are modified in combination with the influence law of the model parameter on the model and the characteristics of rock stress-strain curve. Accordingly，the rock softening and damage model is proposed and shown to be rational with bright prospect of applications in engineering.
