Damage constitutive model of cemented tailing paste under initial temperature effect

It is a universal phenomenon for all the mines that paste-filling material arrives at stope at different initial temperatures. The strength properties and stress-strain relation of paste at different initial temperatures have effect on the mining-filling cycle and the dilution of adjacent stope mining. A series of uniaxial compressive strength tests were performed on hardened paste with initial temperatures of 2, 20, 35 and 50℃ to obtain the stress-strain evolution curves at different initial temperatures. The damage constitutive models of paste at different initial temperatures were established on the basis of theoretical derivation and experimental results. A temperature-time coupling damage constitutive model was further proposed according to parameter regression of the established models. Finally, the temperature-time coupling damage constitutive model was embed into the solid mechanics module of Comsol software, which is for uniaxial compressive experiment simulation. The simulation results show good accordance with the experimental stress-strain curves, verifying the reliability of the proposed constitutive model.