Study on Rock Damage Characteristics and Model Based on Energy Dissipation
In order to effectively prevent the occurrence of high energy engineering geological disasters of rock mass,based on the energy dissipation theory,the mathematical expression of the dissipated energy considering the preset confining pressure effect is proposed,and the mathematical expression of the damage variable stress-strain composed of Weibull distribution function and energy dissipation function considering the preset confining pressure effect is derived,and the coal rock damage constitutive model based on the modified energy dissipation function is constructed.The results show that the energy variation of coal rock under different confining pressures has a similar evolution pattern with the increase of axial strain,and the energy transformation of coal rock shows a phased change in different damage deformation and failure stages;the damage evolution of coal rock under different confining pressure conditions has experienced a stage from slow growth to rapid growth,and the change trend of damage variables increases exponentially with the increase of axial strain;the damage constitutive model based on the modified energy dissipation function has a high matching degree with the experimental values,and can accurately characterize the damage deformation characteristics of coal rock;the energy storage and dissipation in the deformation and failure process of coal rock are closely related to the damage state;the damage variable representing the degree of damage and deterioration of coal rock and the energy dissipation generally show a power function increasing trend.
coal rockenergy characteristicsdeformation and failuredamage characteristicsconstitutive model
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