In order to explore the mechanical properties and energy evolution law of limestone under uniaxial compres-sion,this paper uses the numerical analysis software FLAC 3D based on finite difference to simulate the uniaxial com-pression of limestone standard cylinder specimens,and calculates and analyzes them based on the Mohr Coulomb con-stitutive model and strain softening constitutive model in FLAC 3D software.The numerical results under different con-stitutive models are obtained,and the energy evolution of the numerical models during loading is analyzed according to the energy law.The results show that:(1)the peak strength of the Mohr Coulomb model decreases with the attenua-tion of cohesion;(2)The axial stress of the strain-softening constitutive model is consistent with that of the Mohr Coulomb model before the peak strength,but gradually decreases with the increase of load after the peak strength;(3)Before the peak strength,the total energy density and dissipated energy density of the two models gradually in-crease.After the peak strength,the elastic energy density of the Mohr Coulomb model tends to be stable,and the elas-tic energy density of the strain softening model gradually approaches 0.
limestoneuniaxial compressionconstitutive modelenergy density
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